diff options
Diffstat (limited to 'drivers/video/stm32')
| -rw-r--r-- | drivers/video/stm32/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/video/stm32/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/stm32/stm32_ltdc.c | 158 | ||||
| -rw-r--r-- | drivers/video/stm32/stm32_lvds.c | 693 |
4 files changed, 848 insertions, 13 deletions
diff --git a/drivers/video/stm32/Kconfig b/drivers/video/stm32/Kconfig index c354c402c28..4cb8a841caf 100644 --- a/drivers/video/stm32/Kconfig +++ b/drivers/video/stm32/Kconfig @@ -23,6 +23,15 @@ config VIDEO_STM32_DSI This option enables support DSI internal bridge which can be used on devices which have DSI devices connected. +config VIDEO_STM32_LVDS + bool "Enable STM32 LVDS video support" + depends on VIDEO_STM32 + select VIDEO_BRIDGE + select VIDEO_DW_MIPI_DSI + help + This enables Low Voltage Differential Signaling (LVDS) display + support. + config VIDEO_STM32_MAX_XRES int "Maximum horizontal resolution (for memory allocation purposes)" depends on VIDEO_STM32 diff --git a/drivers/video/stm32/Makefile b/drivers/video/stm32/Makefile index f8b42d1a4d1..059d9000c1d 100644 --- a/drivers/video/stm32/Makefile +++ b/drivers/video/stm32/Makefile @@ -7,3 +7,4 @@ obj-${CONFIG_VIDEO_STM32} = stm32_ltdc.o obj-${CONFIG_VIDEO_STM32_DSI} += stm32_dsi.o +obj-${CONFIG_VIDEO_STM32_LVDS} += stm32_lvds.o diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c index 0a062c8939d..834bfb625d2 100644 --- a/drivers/video/stm32/stm32_ltdc.c +++ b/drivers/video/stm32/stm32_ltdc.c @@ -17,6 +17,7 @@ #include <video_bridge.h> #include <asm/io.h> #include <dm/device-internal.h> +#include <dm/uclass-internal.h> #include <dm/device_compat.h> #include <linux/bitops.h> #include <linux/printk.h> @@ -262,6 +263,7 @@ static const u32 layer_regs_a2[] = { #define HWVER_10300 0x010300 #define HWVER_20101 0x020101 #define HWVER_40100 0x040100 +#define HWVER_40101 0x040101 enum stm32_ltdc_pix_fmt { PF_ARGB8888 = 0, /* ARGB [32 bits] */ @@ -494,6 +496,101 @@ static void stm32_ltdc_set_layer1(struct stm32_ltdc_priv *priv, ulong fb_addr) setbits_le32(priv->regs + LTDC_L1CR, LXCR_LEN); } +static int stm32_ltdc_get_remote_device(struct udevice *dev, ofnode ep_node, + enum uclass_id id, struct udevice **remote_dev) +{ + u32 remote_phandle; + ofnode remote; + int ret = 0; + + ret = ofnode_read_u32(ep_node, "remote-endpoint", &remote_phandle); + if (ret) { + dev_err(dev, "%s(%s): Could not find remote-endpoint property\n", + __func__, dev_read_name(dev)); + return ret; + } + + remote = ofnode_get_by_phandle(remote_phandle); + if (!ofnode_valid(remote)) + return -EINVAL; + + while (ofnode_valid(remote)) { + remote = ofnode_get_parent(remote); + if (!ofnode_valid(remote)) { + dev_dbg(dev, "%s(%s): no uclass_id %d for remote-endpoint\n", + __func__, dev_read_name(dev), id); + continue; + } + + ret = uclass_find_device_by_ofnode(id, remote, remote_dev); + if (*remote_dev && !ret) { + ret = uclass_get_device_by_ofnode(id, remote, remote_dev); + if (ret) + dev_dbg(dev, "%s(%s): failed to get remote device %s\n", + __func__, dev_read_name(dev), dev_read_name(*remote_dev)); + break; + } + }; + + return ret; +} + +static int stm32_ltdc_get_panel(struct udevice *dev, struct udevice **panel) +{ + ofnode ep_node, node, ports; + int ret = 0; + + if (!dev) + return -EINVAL; + + ports = ofnode_find_subnode(dev_ofnode(dev), "ports"); + if (!ofnode_valid(ports)) { + dev_err(dev, "Remote bridge subnode\n"); + return ret; + } + + for (node = ofnode_first_subnode(ports); + ofnode_valid(node); + node = dev_read_next_subnode(node)) { + ep_node = ofnode_first_subnode(node); + if (!ofnode_valid(ep_node)) + continue; + + ret = stm32_ltdc_get_remote_device(dev, ep_node, UCLASS_PANEL, panel); + } + + /* Sanity check, we can get out of the loop without having a clean ofnode */ + if (!(*panel)) + ret = -EINVAL; + else + if (!ofnode_valid(dev_ofnode(*panel))) + ret = -EINVAL; + + return ret; +} + +static int stm32_ltdc_display_init(struct udevice *dev, ofnode *ep_node, + struct udevice **panel, struct udevice **bridge) +{ + int ret; + + if (*panel) + return -EINVAL; + + if (IS_ENABLED(CONFIG_VIDEO_BRIDGE)) { + ret = stm32_ltdc_get_remote_device(dev, *ep_node, UCLASS_VIDEO_BRIDGE, bridge); + if (ret) + return ret; + + ret = stm32_ltdc_get_panel(*bridge, panel); + } else { + /* no bridge, search a panel from display controller node */ + ret = stm32_ltdc_get_remote_device(dev, *ep_node, UCLASS_PANEL, panel); + } + + return ret; +} + #if IS_ENABLED(CONFIG_TARGET_STM32F469_DISCOVERY) static int stm32_ltdc_alloc_fb(struct udevice *dev) { @@ -529,8 +626,9 @@ static int stm32_ltdc_probe(struct udevice *dev) struct udevice *bridge = NULL; struct udevice *panel = NULL; struct display_timing timings; - struct clk pclk; + struct clk pclk, bclk; struct reset_ctl rst; + ofnode node, port; ulong rate; int ret; @@ -540,7 +638,21 @@ static int stm32_ltdc_probe(struct udevice *dev) return -EINVAL; } - ret = clk_get_by_index(dev, 0, &pclk); + ret = clk_get_by_name(dev, "bus", &bclk); + if (ret) { + if (ret != -ENODATA) { + dev_err(dev, "bus clock get error %d\n", ret); + return ret; + } + } else { + ret = clk_enable(&bclk); + if (ret) { + dev_err(dev, "bus clock enable error %d\n", ret); + return ret; + } + } + + ret = clk_get_by_name(dev, "lcd", &pclk); if (ret) { dev_err(dev, "peripheral clock get error %d\n", ret); return ret; @@ -553,7 +665,7 @@ static int stm32_ltdc_probe(struct udevice *dev) } priv->hw_version = readl(priv->regs + LTDC_IDR); - debug("%s: LTDC hardware 0x%x\n", __func__, priv->hw_version); + dev_dbg(dev, "%s: LTDC hardware 0x%x\n", __func__, priv->hw_version); switch (priv->hw_version) { case HWVER_10200: @@ -566,6 +678,7 @@ static int stm32_ltdc_probe(struct udevice *dev) priv->pix_fmt_hw = pix_fmt_a1; break; case HWVER_40100: + case HWVER_40101: priv->layer_regs = layer_regs_a2; priv->pix_fmt_hw = pix_fmt_a2; break; @@ -573,13 +686,35 @@ static int stm32_ltdc_probe(struct udevice *dev) return -ENODEV; } - ret = uclass_first_device_err(UCLASS_PANEL, &panel); - if (ret) { - if (ret != -ENODEV) - dev_err(dev, "panel device error %d\n", ret); - return ret; + /* + * Try all the ports until one working. + * + * This is done in two times. First is checks for the + * UCLASS_VIDEO_BRIDGE available, and then for this bridge + * it scans for a UCLASS_PANEL. + */ + + port = dev_read_subnode(dev, "port"); + if (!ofnode_valid(port)) { + dev_err(dev, "%s(%s): 'port' subnode not found\n", + __func__, dev_read_name(dev)); + return -EINVAL; } + for (node = ofnode_first_subnode(port); + ofnode_valid(node); + node = dev_read_next_subnode(node)) { + ret = stm32_ltdc_display_init(dev, &node, &panel, &bridge); + if (ret) + dev_dbg(dev, "Device failed ret=%d\n", ret); + else + break; + } + + /* Sanity check */ + if (ret) + return ret; + ret = panel_get_display_timing(panel, &timings); if (ret) { ret = ofnode_decode_display_timing(dev_ofnode(panel), @@ -608,11 +743,6 @@ static int stm32_ltdc_probe(struct udevice *dev) reset_deassert(&rst); if (IS_ENABLED(CONFIG_VIDEO_BRIDGE)) { - ret = uclass_get_device(UCLASS_VIDEO_BRIDGE, 0, &bridge); - if (ret) - dev_dbg(dev, - "No video bridge, or no backlight on bridge\n"); - if (bridge) { ret = video_bridge_attach(bridge); if (ret) { @@ -688,6 +818,8 @@ static int stm32_ltdc_bind(struct udevice *dev) static const struct udevice_id stm32_ltdc_ids[] = { { .compatible = "st,stm32-ltdc" }, + { .compatible = "st,stm32mp251-ltdc" }, + { .compatible = "st,stm32mp255-ltdc" }, { } }; diff --git a/drivers/video/stm32/stm32_lvds.c b/drivers/video/stm32/stm32_lvds.c new file mode 100644 index 00000000000..bf1393c9e87 --- /dev/null +++ b/drivers/video/stm32/stm32_lvds.c @@ -0,0 +1,693 @@ +// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause +/* + * Copyright (C) 2025 STMicroelectronics - All Rights Reserved + * Author(s): Raphaël Gallais-Pou <raphael.gallais-pou@foss.st.com> for STMicroelectronics. + * + * This Low Voltage Differential Signal controller driver is based on the Linux Kernel driver from + * drivers/gpu/drm/stm/ltdc.c + */ + +#define LOG_CATEGORY UCLASS_VIDEO_BRIDGE + +#include <clk.h> +#include <dm.h> +#include <log.h> +#include <media_bus_format.h> +#include <panel.h> +#include <reset.h> +#include <video.h> +#include <video_bridge.h> +#include <asm/io.h> +#include <dm/device_compat.h> +#include <dm/ofnode.h> +#include <linux/iopoll.h> + +/* LVDS Host registers */ +#define LVDS_CR 0x0000 /* configuration register */ +#define LVDS_DMLCR0 0x0004 /* data mapping lsb configuration register 0 */ +#define LVDS_DMMCR0 0x0008 /* data mapping msb configuration register 0 */ +#define LVDS_DMLCR1 0x000C /* data mapping lsb configuration register 1 */ +#define LVDS_DMMCR1 0x0010 /* data mapping msb configuration register 1 */ +#define LVDS_DMLCR2 0x0014 /* data mapping lsb configuration register 2 */ +#define LVDS_DMMCR2 0x0018 /* data mapping msb configuration register 2 */ +#define LVDS_DMLCR3 0x001C /* data mapping lsb configuration register 3 */ +#define LVDS_DMMCR3 0x0020 /* data mapping msb configuration register 3 */ +#define LVDS_DMLCR4 0x0024 /* data mapping lsb configuration register 4 */ +#define LVDS_DMMCR4 0x0028 /* data mapping msb configuration register 4 */ +#define LVDS_DMLCR(id) (LVDS_DMLCR0 + 8U * (id)) +#define LVDS_DMMCR(id) (LVDS_DMMCR0 + 8U * (id)) +#define LVDS_CDL1CR 0x002C /* channel distrib link 1 configuration register */ +#define LVDS_CDL2CR 0x0030 /* channel distrib link 2 configuration register */ + +#define CDL1CR_DEFAULT 0x4321 +#define CDL2CR_DEFAULT 0x59876 + +/* LVDS Host registers */ +#define LVDS_PHY_MASTER 0x0 +#define LVDS_PHY_SLAVE 0x100 + +/* phy parameter can only be one of those two above */ +#define LVDS_PXGCR(phy) ((phy) + 0x1000) /* Global Control Register */ +#define LVDS_PXCMCR1(phy) ((phy) + 0x100C) /* Current Mode Control Register 1 */ +#define LVDS_PXCMCR2(phy) ((phy) + 0x1010) /* Current Mode Control Register 2 */ +#define LVDS_PXSCR(phy) ((phy) + 0x1020) /* Serial Control Register */ +#define LVDS_PXBCR1(phy) ((phy) + 0x102C) /* Bias Control Register 1 */ +#define LVDS_PXBCR2(phy) ((phy) + 0x1030) /* Bias Control Register 2 */ +#define LVDS_PXBCR3(phy) ((phy) + 0x1034) /* Bias Control Register 3 */ +#define LVDS_PXMPLCR(phy) ((phy) + 0x1064) /* Monitor PLL Lock Control Register */ +#define LVDS_PXDCR(phy) ((phy) + 0x1084) /* Debug Control Register */ +#define LVDS_PXSSR1(phy) ((phy) + 0x1088) /* Spare Status Register 1 */ +#define LVDS_PXCFGCR(phy) ((phy) + 0x10A0) /* Configuration Control Register */ +#define LVDS_PXPLLCR1(phy) ((phy) + 0x10C0) /* PLL_MODE 1 Control Register */ +#define LVDS_PXPLLCR2(phy) ((phy) + 0x10C4) /* PLL_MODE 2 Control Register */ +#define LVDS_PXPLLSR(phy) ((phy) + 0x10C8) /* PLL Status Register */ +#define LVDS_PXPLLSDCR1(phy) ((phy) + 0x10CC) /* PLL_SD_1 Control Register */ +#define LVDS_PXPLLSDCR2(phy) ((phy) + 0x10D0) /* PLL_SD_2 Control Register */ +#define LVDS_PXPLLTWGCR1(phy) ((phy) + 0x10D4) /* PLL_TWG_1 Control Register */ +#define LVDS_PXPLLTWGCR2(phy) ((phy) + 0x10D8) /* PLL_TWG_2 Control Register */ +#define LVDS_PXPLLCPCR(phy) ((phy) + 0x10E0) /* PLL_CP Control Register */ +#define LVDS_PXPLLTESTCR(phy) ((phy) + 0x10E8) /* PLL_TEST Control Register */ + +/* LVDS Wrapper registers */ +#define LVDS_WCLKCR 0x11B0 /* Wrapper clock control register */ +#define LVDS_HWCFGR 0x1FF0 /* HW configuration register */ +#define LVDS_VERR 0x1FF4 /* Version register */ +#define LVDS_IPIDR 0x1FF8 /* Identification register */ +#define LVDS_SIDR 0x1FFC /* Size Identification register */ + +#define CR_LVDSEN BIT(0) /* LVDS PHY Enable */ +#define CR_HSPOL BIT(1) /* HS Polarity (horizontal sync) */ +#define CR_VSPOL BIT(2) /* VS Polarity (vertical sync) */ +#define CR_DEPOL BIT(3) /* DE Polarity (data enable) */ +#define CR_CI BIT(4) /* Control Internal (software controlled bit) */ +#define CR_LKMOD BIT(5) /* Link Mode, for both Links */ +#define CR_LKPHA BIT(6) /* Link Phase, for both Links */ +#define CR_LK1POL GENMASK(20, 16) /* Link-1 output Polarity */ +#define CR_LK2POL GENMASK(25, 21) /* Link-2 output Polarity */ + +#define DMMCRX_MAP0 GENMASK(4, 0) +#define DMMCRX_MAP1 GENMASK(9, 5) +#define DMMCRX_MAP2 GENMASK(14, 10) +#define DMMCRX_MAP3 GENMASK(19, 15) +#define DMLCRX_MAP4 GENMASK(4, 0) +#define DMLCRX_MAP5 GENMASK(9, 5) +#define DMLCRX_MAP6 GENMASK(14, 10) + +#define CDLCRX_DISTR0 GENMASK(3, 0) +#define CDLCRX_DISTR1 GENMASK(7, 4) +#define CDLCRX_DISTR2 GENMASK(11, 8) +#define CDLCRX_DISTR3 GENMASK(15, 12) +#define CDLCRX_DISTR4 GENMASK(19, 16) + +#define FREF_INDEX 0 +#define NDIV_INDEX 1 +#define FPFD_INDEX 2 +#define MDIV_INDEX 3 +#define FVCO_INDEX 4 +#define BDIV_INDEX 5 +#define FBIT_INDEX 6 +#define FLS_INDEX 7 +#define FDP_INDEX 8 + +#define PXGCR_BIT_CLK_OUT BIT(0) +#define PXGCR_LS_CLK_OUT BIT(4) +#define PXGCR_DP_CLK_OUT BIT(8) +#define PXGCR_RSTZ BIT(24) +#define PXGCR_DIV_RSTN BIT(25) + +#define PXCMCR1_CM_EN_DL (BIT(28) | BIT(20) | BIT(12) | BIT(4)) +#define PXCMCR2_CM_EN_DL4 BIT(4) +#define PXSCR_SER_DATA_OK BIT(16) +#define PXBCR1_EN_BIAS_DL (BIT(16) | BIT(12) | BIT(8) | BIT(4) | BIT(0)) +#define PXBCR2_BIAS_EN BIT(28) +#define PXBCR3_VM_EN_DL (BIT(16) | BIT(12) | BIT(8) | BIT(4) | BIT(0)) +#define PXDCR_POWER_OK BIT(12) +#define PXCFGCR_EN_DIG_DL GENMASK(4, 0) + +#define PXPLLCR1_PLL_EN BIT(0) +#define PxPLLCR1_SD_EN BIT(1) +#define PXPLLCR1_TWG_EN BIT(2) +#define PXPLLCR1_PLL_DIVIDERS_EN BIT(8) +#define PXPLLCR2_NDIV GENMASK(25, 16) +#define PXPLLCR2_BDIV GENMASK(9, 0) +#define PXPLLSR_PLL_LOCK BIT(0) +#define PXPLLSDCR1_MDIV GENMASK(9, 0) +#define PXPLLCPCR_CPCTRL_DEFAULT 0x1 +#define PXPLLTESTCR_PLL_TEST_CLK_EN BIT(0) +#define PXPLLTESTCR_PLL_TDIV_EN BIT(8) +#define PXPLLTESTCR_TDIV GENMASK(25, 16) +#define PXPLLTESTCR_TDIV_VALUE 70 + +#define WCLKCR_SLV_CLKPIX_SEL BIT(0) +#define WCLKCR_SRCSEL BIT(8) + +/* Sleep & timeout for pll lock/unlock */ +#define SLEEP_US 1000 +#define TIMEOUT_US 20000000 + +#define PHY_SLV_OFS 0x100 + +/* PLL parameters */ +#define NDIV_MIN 2 +#define NDIV_MAX 6 +#define BDIV_MIN 2 +#define BDIV_MAX 6 +#define MDIV_MIN 1 +#define MDIV_MAX 1023 + +struct stm32_lvds_plat { + void __iomem *base; + struct udevice *panel; + struct reset_ctl rst; + struct clk pclk; + struct clk refclk; +}; + +struct stm32_lvds_priv { + struct display_timing timings; + u32 refclk_rate; + int dual_link; + int bus_format; +}; + +/* + * enum lvds_pixels_order - Pixel order of an LVDS connection + * @LVDS_DUAL_LINK_EVEN_ODD_PIXELS: Even pixels are expected to be generated + * from the first port, odd pixels from the second port + * @LVDS_DUAL_LINK_ODD_EVEN_PIXELS: Odd pixels are expected to be generated + * from the first port, even pixels from the second port + */ +enum lvds_pixels_order { + LVDS_DUAL_LINK_EVEN_ODD_PIXELS = BIT(0), + LVDS_DUAL_LINK_ODD_EVEN_PIXELS = BIT(1), +}; + +enum lvds_pixel { + PIX_R_0 = 0x00, + PIX_R_1 = 0x01, + PIX_R_2 = 0x02, + PIX_R_3 = 0x03, + PIX_R_4 = 0x04, + PIX_R_5 = 0x05, + PIX_R_6 = 0x06, + PIX_R_7 = 0x07, + PIX_G_0 = 0x08, + PIX_G_1 = 0x09, + PIX_G_2 = 0x0A, + PIX_G_3 = 0x0B, + PIX_G_4 = 0x0C, + PIX_G_5 = 0x0D, + PIX_G_6 = 0x0E, + PIX_G_7 = 0x0F, + PIX_B_0 = 0x10, + PIX_B_1 = 0x11, + PIX_B_2 = 0x12, + PIX_B_3 = 0x13, + PIX_B_4 = 0x14, + PIX_B_5 = 0x15, + PIX_B_6 = 0x16, + PIX_B_7 = 0x17, + PIX_H_S = 0x18, + PIX_V_S = 0x19, + PIX_D_E = 0x1A, + PIX_C_E = 0x1B, + PIX_C_I = 0x1C, + PIX_TOG = 0x1D, + PIX_ONE = 0x1E, + PIX_ZER = 0x1F, +}; + +/* + * Expected JEIDA-RGB888 data to be sent in LSB format + * bit6 ............................bit0 + */ +const enum lvds_pixel lvds_bitmap_jeida_rgb888[5][7] = { + { PIX_ONE, PIX_ONE, PIX_ZER, PIX_ZER, PIX_ZER, PIX_ONE, PIX_ONE }, + { PIX_G_2, PIX_R_7, PIX_R_6, PIX_R_5, PIX_R_4, PIX_R_3, PIX_R_2 }, + { PIX_B_3, PIX_B_2, PIX_G_7, PIX_G_6, PIX_G_5, PIX_G_4, PIX_G_3 }, + { PIX_D_E, PIX_V_S, PIX_H_S, PIX_B_7, PIX_B_6, PIX_B_5, PIX_B_4 }, + { PIX_C_E, PIX_B_1, PIX_B_0, PIX_G_1, PIX_G_0, PIX_R_1, PIX_R_0 } +}; + +/* + * Expected VESA-RGB888 data to be sent in LSB format + * bit6 ............................bit0 + */ +const enum lvds_pixel lvds_bitmap_vesa_rgb888[5][7] = { + { PIX_ONE, PIX_ONE, PIX_ZER, PIX_ZER, PIX_ZER, PIX_ONE, PIX_ONE }, + { PIX_G_0, PIX_R_5, PIX_R_4, PIX_R_3, PIX_R_2, PIX_R_1, PIX_R_0 }, + { PIX_B_1, PIX_B_0, PIX_G_5, PIX_G_4, PIX_G_3, PIX_G_2, PIX_G_1 }, + { PIX_D_E, PIX_V_S, PIX_H_S, PIX_B_5, PIX_B_4, PIX_B_3, PIX_B_2 }, + { PIX_C_E, PIX_B_7, PIX_B_6, PIX_G_7, PIX_G_6, PIX_R_7, PIX_R_6 } +}; + +static inline void lvds_writel(void __iomem *base, u32 reg, u32 val) +{ + writel(val, base + reg); +} + +static inline u32 lvds_readl(void __iomem *base, u32 reg) +{ + return readl(base + reg); +} + +static inline void lvds_set(void __iomem *base, u32 reg, u32 mask) +{ + lvds_writel(base, reg, lvds_readl(base, reg) | mask); +} + +static inline void lvds_clear(void __iomem *base, u32 reg, u32 mask) +{ + lvds_writel(base, reg, lvds_readl(base, reg) & ~mask); +} + +static u32 pll_get_clkout_khz(u32 clkin_khz, u32 bdiv, u32 mdiv, u32 ndiv) +{ + int divisor = ndiv * bdiv; + + /* Prevents from division by 0 */ + if (!divisor) + return 0; + + return clkin_khz * mdiv / divisor; +} + +static int lvds_pll_get_params(u32 clkin_khz, u32 clkout_khz, + u32 *bdiv, u32 *mdiv, u32 *ndiv) +{ + u32 i, o, n; + u32 delta, best_delta; /* all in khz */ + + /* Early checks preventing division by 0 & odd results */ + if (clkin_khz == 0 || clkout_khz == 0) + return -EINVAL; + + best_delta = 1000000; /* big started value (1000000khz) */ + + for (i = NDIV_MIN; i <= NDIV_MAX; i++) { + for (o = BDIV_MIN; o <= BDIV_MAX; o++) { + n = DIV_ROUND_CLOSEST(i * o * clkout_khz, clkin_khz); + /* Check ndiv according to vco range */ + if (n < MDIV_MIN || n > MDIV_MAX) + continue; + /* Check if new delta is better & saves parameters */ + delta = abs(pll_get_clkout_khz(clkin_khz, i, n, o) - clkout_khz); + if (delta < best_delta) { + *ndiv = i; + *mdiv = n; + *bdiv = o; + best_delta = delta; + } + /* fast return in case of "perfect result" */ + if (!delta) + return 0; + } + } + + return 0; +} + +static int stm32_lvds_pll_enable(struct udevice *dev, + int phy) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + struct stm32_lvds_priv *priv = dev_get_priv(dev); + struct display_timing timings = priv->timings; + u32 pll_in_khz, bdiv = 0, mdiv = 0, ndiv = 0; + int ret, val, multiplier; + + /* Release PHY from reset */ + lvds_set(plat->base, LVDS_PXGCR(phy), PXGCR_DIV_RSTN | PXGCR_RSTZ); + + /* lvds_pll_config */ + /* Set PLL Slv & Mst configs and timings */ + pll_in_khz = priv->refclk_rate / 1000; + + if (priv->dual_link) + multiplier = 2; + else + multiplier = 1; + + ret = lvds_pll_get_params(pll_in_khz, timings.pixelclock.typ * 7 / 1000 / multiplier, + &bdiv, &mdiv, &ndiv); + if (ret) + return ret; + + /* Set PLL parameters */ + lvds_writel(plat->base, LVDS_PXPLLCR2(phy), (ndiv << 16) | bdiv); + lvds_writel(plat->base, LVDS_PXPLLSDCR1(phy), mdiv); + lvds_writel(plat->base, LVDS_PXPLLTESTCR(phy), PXPLLTESTCR_TDIV_VALUE << 16); + + /* Disable TWG and SD: for now, PLL just need to be in integer mode */ + lvds_clear(plat->base, LVDS_PXPLLCR1(phy), PXPLLCR1_TWG_EN | PxPLLCR1_SD_EN); + + /* Power up bias and PLL dividers */ + lvds_set(plat->base, LVDS_PXDCR(phy), PXDCR_POWER_OK); + + lvds_set(plat->base, LVDS_PXCMCR1(phy), PXCMCR1_CM_EN_DL); + lvds_set(plat->base, LVDS_PXCMCR2(phy), PXCMCR2_CM_EN_DL4); + + lvds_set(plat->base, LVDS_PXPLLCPCR(phy), PXPLLCPCR_CPCTRL_DEFAULT); + lvds_set(plat->base, LVDS_PXBCR3(phy), PXBCR3_VM_EN_DL); + lvds_set(plat->base, LVDS_PXBCR1(phy), PXBCR1_EN_BIAS_DL); + lvds_set(plat->base, LVDS_PXCFGCR(phy), PXCFGCR_EN_DIG_DL); + + /* lvds_pll_enable */ + /* PLL lock timing control for the monitor unmask after startup (pll_en) */ + /* Adjust the value so that the masking window is opened at start-up */ + /* MST_MON_PLL_LOCK_UNMASK_TUNE */ + lvds_writel(plat->base, LVDS_PXMPLCR(phy), (0x200 - 0x160) << 16); + + lvds_writel(plat->base, LVDS_PXBCR2(phy), PXBCR2_BIAS_EN); + + lvds_set(plat->base, LVDS_PXGCR(phy), + PXGCR_DP_CLK_OUT | PXGCR_LS_CLK_OUT | PXGCR_BIT_CLK_OUT); + + lvds_set(plat->base, LVDS_PXPLLTESTCR(phy), PXPLLTESTCR_PLL_TDIV_EN); + lvds_set(plat->base, LVDS_PXPLLCR1(phy), PXPLLCR1_PLL_DIVIDERS_EN); + lvds_set(plat->base, LVDS_PXSCR(phy), PXSCR_SER_DATA_OK); + + /* Enable the LVDS PLL & wait for its lock */ + lvds_set(plat->base, LVDS_PXPLLCR1(phy), PXPLLCR1_PLL_EN); + ret = readl_poll_sleep_timeout(plat->base + LVDS_PXPLLSR(phy), + val, val & PXPLLSR_PLL_LOCK, SLEEP_US, TIMEOUT_US); + if (ret) + return ret; + + /* Select MST PHY clock as pixel clock for the LDITX instead of FREF */ + /* WCLKCR_SLV_CLKPIX_SEL is for dual link */ + lvds_writel(plat->base, LVDS_WCLKCR, WCLKCR_SLV_CLKPIX_SEL); + + lvds_set(plat->base, LVDS_PXPLLTESTCR(phy), PXPLLTESTCR_PLL_TEST_CLK_EN); + + return 0; +} + +static int stm32_lvds_enable(struct udevice *dev) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + struct stm32_lvds_priv *priv = dev_get_priv(dev); + struct display_timing timings = priv->timings; + u32 lvds_cdl1cr = 0; + u32 lvds_cdl2cr = 0; + u32 lvds_dmlcr = 0; + u32 lvds_dmmcr = 0; + u32 lvds_cr = 0; + int i; + + lvds_clear(plat->base, LVDS_CDL1CR, CDLCRX_DISTR0 | CDLCRX_DISTR1 | CDLCRX_DISTR2 + | CDLCRX_DISTR3 | CDLCRX_DISTR4); + lvds_clear(plat->base, LVDS_CDL2CR, CDLCRX_DISTR0 | CDLCRX_DISTR1 | CDLCRX_DISTR2 + | CDLCRX_DISTR3 | CDLCRX_DISTR4); + + /* Set channel distribution */ + lvds_cr &= ~CR_LKMOD; + lvds_cdl1cr = CDL1CR_DEFAULT; + + if (priv->dual_link) { + lvds_cr |= CR_LKMOD; + lvds_cdl2cr = CDL2CR_DEFAULT; + } + + /* Set signal polarity */ + if (timings.flags & DISPLAY_FLAGS_DE_LOW) + lvds_cr |= CR_DEPOL; + + if (timings.flags & DISPLAY_FLAGS_HSYNC_LOW) + lvds_cr |= CR_HSPOL; + + if (timings.flags & DISPLAY_FLAGS_VSYNC_LOW) + lvds_cr |= CR_VSPOL; + + /* Set link phase */ + switch (priv->dual_link) { + case LVDS_DUAL_LINK_EVEN_ODD_PIXELS: /* LKPHA = 0 */ + lvds_cr &= ~CR_LKPHA; + break; + case LVDS_DUAL_LINK_ODD_EVEN_PIXELS: /* LKPHA = 1 */ + lvds_cr |= CR_LKPHA; + break; + default: + dev_dbg(dev, "No phase precised, setting default\n"); + lvds_cr &= ~CR_LKPHA; + break; + } + + /* Set Data Mapping */ + switch (priv->bus_format) { + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: /* VESA-RGB888 */ + for (i = 0; i < 5; i++) { + lvds_dmlcr = ((lvds_bitmap_vesa_rgb888[i][0]) + + (lvds_bitmap_vesa_rgb888[i][1] << 5) + + (lvds_bitmap_vesa_rgb888[i][2] << 10) + + (lvds_bitmap_vesa_rgb888[i][3] << 15)); + lvds_dmmcr = ((lvds_bitmap_vesa_rgb888[i][4]) + + (lvds_bitmap_vesa_rgb888[i][5] << 5) + + (lvds_bitmap_vesa_rgb888[i][6] << 10)); + + /* Write registers at the end of computations */ + lvds_writel(plat->base, LVDS_DMLCR(i), lvds_dmlcr); + lvds_writel(plat->base, LVDS_DMMCR(i), lvds_dmmcr); + } + break; + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: /* JEIDA-RGB888 */ + for (i = 0; i < 5; i++) { + lvds_dmlcr = ((lvds_bitmap_jeida_rgb888[i][0]) + + (lvds_bitmap_jeida_rgb888[i][1] << 5) + + (lvds_bitmap_jeida_rgb888[i][2] << 10) + + (lvds_bitmap_jeida_rgb888[i][3] << 15)); + lvds_dmmcr = ((lvds_bitmap_jeida_rgb888[i][4]) + + (lvds_bitmap_jeida_rgb888[i][5] << 5) + + (lvds_bitmap_jeida_rgb888[i][6] << 10)); + + /* Write registers at the end of computations */ + lvds_writel(plat->base, LVDS_DMLCR(i), lvds_dmlcr); + lvds_writel(plat->base, LVDS_DMMCR(i), lvds_dmmcr); + } + break; + default: + dev_dbg(dev, "Unsupported LVDS bus format 0x%04x\n", priv->bus_format); + } + + /* Turn the output on */ + lvds_cr |= CR_LVDSEN; + + /* Commit config to registers */ + lvds_set(plat->base, LVDS_CR, lvds_cr); + lvds_writel(plat->base, LVDS_CDL1CR, lvds_cdl1cr); + lvds_writel(plat->base, LVDS_CDL2CR, lvds_cdl2cr); + + return 0; +} + +static int stm32_lvds_attach(struct udevice *dev) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + struct stm32_lvds_priv *priv = dev_get_priv(dev); + int ret; + + ret = panel_get_display_timing(plat->panel, &priv->timings); + if (ret) { + ret = ofnode_decode_display_timing(dev_ofnode(plat->panel), + 0, &priv->timings); + if (ret) { + dev_err(dev, "decode display timing error %d\n", ret); + return ret; + } + } + + ret = stm32_lvds_enable(dev); + + return ret; +} + +static int stm32_lvds_set_backlight(struct udevice *dev, int percent) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + int ret; + + ret = panel_enable_backlight(plat->panel); + if (ret) { + dev_err(dev, "panel %s enable backlight error %d\n", + plat->panel->name, ret); + } + + return ret; +} + +static int lvds_handle_pixel_order(struct stm32_lvds_plat *plat) +{ + ofnode parent, panel_port0, panel_port1; + bool even_pixels, odd_pixels; + int port0, port1; + + /* + * In case we are operating in single link, + * there is only one port linked to the LVDS. + * Check whether we are in this case and exit if yes. + */ + parent = ofnode_find_subnode(dev_ofnode(plat->panel), "ports"); + if (!ofnode_valid(parent)) + return 0; + + panel_port0 = ofnode_first_subnode(parent); + if (!ofnode_valid(panel_port0)) + return -EPIPE; + + even_pixels = ofnode_read_bool(panel_port0, "dual-lvds-even-pixels"); + odd_pixels = ofnode_read_bool(panel_port0, "dual-lvds-odd-pixels"); + if (even_pixels && odd_pixels) + return -EINVAL; + + port0 = even_pixels ? LVDS_DUAL_LINK_EVEN_ODD_PIXELS : + LVDS_DUAL_LINK_ODD_EVEN_PIXELS; + + panel_port1 = ofnode_next_subnode(panel_port0); + if (!ofnode_valid(panel_port1)) + return -EPIPE; + + even_pixels = ofnode_read_bool(panel_port1, "dual-lvds-even-pixels"); + odd_pixels = ofnode_read_bool(panel_port1, "dual-lvds-odd-pixels"); + if (even_pixels && odd_pixels) + return -EINVAL; + + port1 = even_pixels ? LVDS_DUAL_LINK_EVEN_ODD_PIXELS : + LVDS_DUAL_LINK_ODD_EVEN_PIXELS; + + /* + * A valid dual-LVDS bus is found when one port is marked with + * "dual-lvds-even-pixels", and the other port is marked with + * "dual-lvds-odd-pixels", bail out if the markers are not right. + */ + if (port0 + port1 != LVDS_DUAL_LINK_EVEN_ODD_PIXELS + LVDS_DUAL_LINK_ODD_EVEN_PIXELS) + return -EINVAL; + + return port0; +} + +static int stm32_lvds_of_to_plat(struct udevice *dev) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + struct stm32_lvds_priv *priv = dev_get_priv(dev); + const char *data_mapping; + int ret; + + plat->base = dev_read_addr_ptr(dev); + if ((fdt_addr_t)plat->base == FDT_ADDR_T_NONE) { + dev_err(dev, "Unable to read LVDS base address\n"); + return -EINVAL; + } + + ret = clk_get_by_name(dev, "pclk", &plat->pclk); + if (ret) { + dev_err(dev, "Unable to get peripheral clock: %d\n", ret); + return ret; + } + + ret = clk_get_by_name(dev, "ref", &plat->refclk); + if (ret) { + dev_err(dev, "Unable to get reference clock: %d\n", ret); + return ret; + } + + ret = reset_get_by_index(dev, 0, &plat->rst); + if (ret) { + dev_err(dev, "Failed to get LVDS reset: %d\n", ret); + return ret; + } + + ret = uclass_get_device_by_driver(UCLASS_PANEL, + DM_DRIVER_GET(simple_panel), &plat->panel); + if (ret) { + dev_err(dev, "panel device error %d\n", ret); + return ret; + } + + ret = panel_get_display_timing(plat->panel, &priv->timings); + if (ret) { + ret = ofnode_decode_display_timing(dev_ofnode(plat->panel), + 0, &priv->timings); + if (ret) { + dev_err(dev, "decode display timing error %d\n", ret); + return ret; + } + } + + data_mapping = ofnode_read_string(dev_ofnode(plat->panel), "data-mapping"); + if (!strcmp(data_mapping, "vesa-24")) + priv->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG; + else if (!strcmp(data_mapping, "jeida-24")) + priv->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA; + else + priv->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG; + + return 0; +} + +static int stm32_lvds_probe(struct udevice *dev) +{ + struct stm32_lvds_plat *plat = dev_get_plat(dev); + struct stm32_lvds_priv *priv = dev_get_priv(dev); + int ret; + + ret = clk_enable(&plat->pclk); + if (ret) { + dev_err(dev, "Failed to enable peripheral clock: %d\n", ret); + return ret; + } + + ret = clk_enable(&plat->refclk); + if (ret) { + dev_err(dev, "Failed to enable reference clock: %d\n", ret); + goto err_clk; + } + + priv->refclk_rate = (unsigned int)clk_get_rate(&plat->refclk); + + reset_deassert(&plat->rst); + + /* Handle dual link config */ + priv->dual_link = lvds_handle_pixel_order(plat); + if (priv->dual_link < 0) + goto err_rst; + + if (priv->dual_link > 0) { + ret = stm32_lvds_pll_enable(dev, LVDS_PHY_SLAVE); + if (ret) + goto err_rst; + } + + ret = stm32_lvds_pll_enable(dev, LVDS_PHY_MASTER); + if (ret) + goto err_rst; + + return 0; + +err_rst: + clk_disable(&plat->refclk); +err_clk: + clk_disable(&plat->pclk); + + return ret; +} + +static const struct video_bridge_ops stm32_lvds_ops = { + .attach = stm32_lvds_attach, + .set_backlight = stm32_lvds_set_backlight, +}; + +static const struct udevice_id stm32_lvds_ids[] = { + {.compatible = "st,stm32mp25-lvds"}, + {} +}; + +U_BOOT_DRIVER(stm32_lvds) = { + .name = "stm32-display-lvds", + .id = UCLASS_VIDEO_BRIDGE, + .of_match = stm32_lvds_ids, + .ops = &stm32_lvds_ops, + .of_to_plat = stm32_lvds_of_to_plat, + .probe = stm32_lvds_probe, + .plat_auto = sizeof(struct stm32_lvds_plat), + .priv_auto = sizeof(struct stm32_lvds_priv), +}; |