summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/dvo_ns2501.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/i915/dvo_ns2501.c')
-rw-r--r--drivers/gpu/drm/i915/dvo_ns2501.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/dvo_ns2501.c b/drivers/gpu/drm/i915/dvo_ns2501.c
new file mode 100644
index 000000000000..c4a255be6979
--- /dev/null
+++ b/drivers/gpu/drm/i915/dvo_ns2501.c
@@ -0,0 +1,588 @@
+/*
+ *
+ * Copyright (c) 2012 Gilles Dartiguelongue, Thomas Richter
+ *
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "dvo.h"
+#include "i915_reg.h"
+#include "i915_drv.h"
+
+#define NS2501_VID 0x1305
+#define NS2501_DID 0x6726
+
+#define NS2501_VID_LO 0x00
+#define NS2501_VID_HI 0x01
+#define NS2501_DID_LO 0x02
+#define NS2501_DID_HI 0x03
+#define NS2501_REV 0x04
+#define NS2501_RSVD 0x05
+#define NS2501_FREQ_LO 0x06
+#define NS2501_FREQ_HI 0x07
+
+#define NS2501_REG8 0x08
+#define NS2501_8_VEN (1<<5)
+#define NS2501_8_HEN (1<<4)
+#define NS2501_8_DSEL (1<<3)
+#define NS2501_8_BPAS (1<<2)
+#define NS2501_8_RSVD (1<<1)
+#define NS2501_8_PD (1<<0)
+
+#define NS2501_REG9 0x09
+#define NS2501_9_VLOW (1<<7)
+#define NS2501_9_MSEL_MASK (0x7<<4)
+#define NS2501_9_TSEL (1<<3)
+#define NS2501_9_RSEN (1<<2)
+#define NS2501_9_RSVD (1<<1)
+#define NS2501_9_MDI (1<<0)
+
+#define NS2501_REGC 0x0c
+
+struct ns2501_priv {
+ //I2CDevRec d;
+ bool quiet;
+ int reg_8_shadow;
+ int reg_8_set;
+ // Shadow registers for i915
+ int dvoc;
+ int pll_a;
+ int srcdim;
+ int fw_blc;
+};
+
+#define NSPTR(d) ((NS2501Ptr)(d->DriverPrivate.ptr))
+
+/*
+ * For reasons unclear to me, the ns2501 at least on the Fujitsu/Siemens
+ * laptops does not react on the i2c bus unless
+ * both the PLL is running and the display is configured in its native
+ * resolution.
+ * This function forces the DVO on, and stores the registers it touches.
+ * Afterwards, registers are restored to regular values.
+ *
+ * This is pretty much a hack, though it works.
+ * Without that, ns2501_readb and ns2501_writeb fail
+ * when switching the resolution.
+ */
+
+static void enable_dvo(struct intel_dvo_device *dvo)
+{
+ struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ DRM_DEBUG_KMS("%s: Trying to re-enable the DVO\n", __FUNCTION__);
+
+ ns->dvoc = I915_READ(DVO_C);
+ ns->pll_a = I915_READ(_DPLL_A);
+ ns->srcdim = I915_READ(DVOC_SRCDIM);
+ ns->fw_blc = I915_READ(FW_BLC);
+
+ I915_WRITE(DVOC, 0x10004084);
+ I915_WRITE(_DPLL_A, 0xd0820000);
+ I915_WRITE(DVOC_SRCDIM, 0x400300); // 1024x768
+ I915_WRITE(FW_BLC, 0x1080304);
+
+ I915_WRITE(DVOC, 0x90004084);
+}
+
+/*
+ * Restore the I915 registers modified by the above
+ * trigger function.
+ */
+static void restore_dvo(struct intel_dvo_device *dvo)
+{
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
+
+ I915_WRITE(DVOC, ns->dvoc);
+ I915_WRITE(_DPLL_A, ns->pll_a);
+ I915_WRITE(DVOC_SRCDIM, ns->srcdim);
+ I915_WRITE(FW_BLC, ns->fw_blc);
+}
+
+/*
+** Read a register from the ns2501.
+** Returns true if successful, false otherwise.
+** If it returns false, it might be wise to enable the
+** DVO with the above function.
+*/
+static bool ns2501_readb(struct intel_dvo_device *dvo, int addr, uint8_t * ch)
+{
+ struct ns2501_priv *ns = dvo->dev_priv;
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ u8 out_buf[2];
+ u8 in_buf[2];
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = dvo->slave_addr,
+ .flags = 0,
+ .len = 1,
+ .buf = out_buf,
+ },
+ {
+ .addr = dvo->slave_addr,
+ .flags = I2C_M_RD,
+ .len = 1,
+ .buf = in_buf,
+ }
+ };
+
+ out_buf[0] = addr;
+ out_buf[1] = 0;
+
+ if (i2c_transfer(adapter, msgs, 2) == 2) {
+ *ch = in_buf[0];
+ return true;
+ };
+
+ if (!ns->quiet) {
+ DRM_DEBUG_KMS
+ ("Unable to read register 0x%02x from %s:0x%02x.\n", addr,
+ adapter->name, dvo->slave_addr);
+ }
+
+ return false;
+}
+
+/*
+** Write a register to the ns2501.
+** Returns true if successful, false otherwise.
+** If it returns false, it might be wise to enable the
+** DVO with the above function.
+*/
+static bool ns2501_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
+{
+ struct ns2501_priv *ns = dvo->dev_priv;
+ struct i2c_adapter *adapter = dvo->i2c_bus;
+ uint8_t out_buf[2];
+
+ struct i2c_msg msg = {
+ .addr = dvo->slave_addr,
+ .flags = 0,
+ .len = 2,
+ .buf = out_buf,
+ };
+
+ out_buf[0] = addr;
+ out_buf[1] = ch;
+
+ if (i2c_transfer(adapter, &msg, 1) == 1) {
+ return true;
+ }
+
+ if (!ns->quiet) {
+ DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d\n",
+ addr, adapter->name, dvo->slave_addr);
+ }
+
+ return false;
+}
+
+/* National Semiconductor 2501 driver for chip on i2c bus
+ * scan for the chip on the bus.
+ * Hope the VBIOS initialized the PLL correctly so we can
+ * talk to it. If not, it will not be seen and not detected.
+ * Bummer!
+ */
+static bool ns2501_init(struct intel_dvo_device *dvo,
+ struct i2c_adapter *adapter)
+{
+ /* this will detect the NS2501 chip on the specified i2c bus */
+ struct ns2501_priv *ns;
+ unsigned char ch;
+
+ ns = kzalloc(sizeof(struct ns2501_priv), GFP_KERNEL);
+ if (ns == NULL)
+ return false;
+
+ dvo->i2c_bus = adapter;
+ dvo->dev_priv = ns;
+ ns->quiet = true;
+
+ if (!ns2501_readb(dvo, NS2501_VID_LO, &ch))
+ goto out;
+
+ if (ch != (NS2501_VID & 0xff)) {
+ DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",
+ ch, adapter->name, dvo->slave_addr);
+ goto out;
+ }
+
+ if (!ns2501_readb(dvo, NS2501_DID_LO, &ch))
+ goto out;
+
+ if (ch != (NS2501_DID & 0xff)) {
+ DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",
+ ch, adapter->name, dvo->slave_addr);
+ goto out;
+ }
+ ns->quiet = false;
+ ns->reg_8_set = 0;
+ ns->reg_8_shadow =
+ NS2501_8_PD | NS2501_8_BPAS | NS2501_8_VEN | NS2501_8_HEN;
+
+ DRM_DEBUG_KMS("init ns2501 dvo controller successfully!\n");
+ return true;
+
+out:
+ kfree(ns);
+ return false;
+}
+
+static enum drm_connector_status ns2501_detect(struct intel_dvo_device *dvo)
+{
+ /*
+ * This is a Laptop display, it doesn't have hotplugging.
+ * Even if not, the detection bit of the 2501 is unreliable as
+ * it only works for some display types.
+ * It is even more unreliable as the PLL must be active for
+ * allowing reading from the chiop.
+ */
+ return connector_status_connected;
+}
+
+static enum drm_mode_status ns2501_mode_valid(struct intel_dvo_device *dvo,
+ struct drm_display_mode *mode)
+{
+ DRM_DEBUG_KMS
+ ("%s: is mode valid (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d)\n",
+ __FUNCTION__, mode->hdisplay, mode->htotal, mode->vdisplay,
+ mode->vtotal);
+
+ /*
+ * Currently, these are all the modes I have data from.
+ * More might exist. Unclear how to find the native resolution
+ * of the panel in here so we could always accept it
+ * by disabling the scaler.
+ */
+ if ((mode->hdisplay == 800 && mode->vdisplay == 600) ||
+ (mode->hdisplay == 640 && mode->vdisplay == 480) ||
+ (mode->hdisplay == 1024 && mode->vdisplay == 768)) {
+ return MODE_OK;
+ } else {
+ return MODE_ONE_SIZE; /* Is this a reasonable error? */
+ }
+}
+
+static void ns2501_mode_set(struct intel_dvo_device *dvo,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ bool ok;
+ bool restore = false;
+ struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
+
+ DRM_DEBUG_KMS
+ ("%s: set mode (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d).\n",
+ __FUNCTION__, mode->hdisplay, mode->htotal, mode->vdisplay,
+ mode->vtotal);
+
+ /*
+ * Where do I find the native resolution for which scaling is not required???
+ *
+ * First trigger the DVO on as otherwise the chip does not appear on the i2c
+ * bus.
+ */
+ do {
+ ok = true;
+
+ if (mode->hdisplay == 800 && mode->vdisplay == 600) {
+ /* mode 277 */
+ ns->reg_8_shadow &= ~NS2501_8_BPAS;
+ DRM_DEBUG_KMS("%s: switching to 800x600\n",
+ __FUNCTION__);
+
+ /*
+ * No, I do not know where this data comes from.
+ * It is just what the video bios left in the DVO, so
+ * I'm just copying it here over.
+ * This also means that I cannot support any other modes
+ * except the ones supported by the bios.
+ */
+ ok &= ns2501_writeb(dvo, 0x11, 0xc8); // 0xc7 also works.
+ ok &= ns2501_writeb(dvo, 0x1b, 0x19);
+ ok &= ns2501_writeb(dvo, 0x1c, 0x62); // VBIOS left 0x64 here, but 0x62 works nicer
+ ok &= ns2501_writeb(dvo, 0x1d, 0x02);
+
+ ok &= ns2501_writeb(dvo, 0x34, 0x03);
+ ok &= ns2501_writeb(dvo, 0x35, 0xff);
+
+ ok &= ns2501_writeb(dvo, 0x80, 0x27);
+ ok &= ns2501_writeb(dvo, 0x81, 0x03);
+ ok &= ns2501_writeb(dvo, 0x82, 0x41);
+ ok &= ns2501_writeb(dvo, 0x83, 0x05);
+
+ ok &= ns2501_writeb(dvo, 0x8d, 0x02);
+ ok &= ns2501_writeb(dvo, 0x8e, 0x04);
+ ok &= ns2501_writeb(dvo, 0x8f, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0x90, 0xfe); /* vertical. VBIOS left 0xff here, but 0xfe works better */
+ ok &= ns2501_writeb(dvo, 0x91, 0x07);
+ ok &= ns2501_writeb(dvo, 0x94, 0x00);
+ ok &= ns2501_writeb(dvo, 0x95, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0x96, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0x99, 0x00);
+ ok &= ns2501_writeb(dvo, 0x9a, 0x88);
+
+ ok &= ns2501_writeb(dvo, 0x9c, 0x23); /* Looks like first and last line of the image. */
+ ok &= ns2501_writeb(dvo, 0x9d, 0x00);
+ ok &= ns2501_writeb(dvo, 0x9e, 0x25);
+ ok &= ns2501_writeb(dvo, 0x9f, 0x03);
+
+ ok &= ns2501_writeb(dvo, 0xa4, 0x80);
+
+ ok &= ns2501_writeb(dvo, 0xb6, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0xb9, 0xc8); /* horizontal? */
+ ok &= ns2501_writeb(dvo, 0xba, 0x00); /* horizontal? */
+
+ ok &= ns2501_writeb(dvo, 0xc0, 0x05); /* horizontal? */
+ ok &= ns2501_writeb(dvo, 0xc1, 0xd7);
+
+ ok &= ns2501_writeb(dvo, 0xc2, 0x00);
+ ok &= ns2501_writeb(dvo, 0xc3, 0xf8);
+
+ ok &= ns2501_writeb(dvo, 0xc4, 0x03);
+ ok &= ns2501_writeb(dvo, 0xc5, 0x1a);
+
+ ok &= ns2501_writeb(dvo, 0xc6, 0x00);
+ ok &= ns2501_writeb(dvo, 0xc7, 0x73);
+ ok &= ns2501_writeb(dvo, 0xc8, 0x02);
+
+ } else if (mode->hdisplay == 640 && mode->vdisplay == 480) {
+ /* mode 274 */
+ DRM_DEBUG_KMS("%s: switching to 640x480\n",
+ __FUNCTION__);
+ /*
+ * No, I do not know where this data comes from.
+ * It is just what the video bios left in the DVO, so
+ * I'm just copying it here over.
+ * This also means that I cannot support any other modes
+ * except the ones supported by the bios.
+ */
+ ns->reg_8_shadow &= ~NS2501_8_BPAS;
+
+ ok &= ns2501_writeb(dvo, 0x11, 0xa0);
+ ok &= ns2501_writeb(dvo, 0x1b, 0x11);
+ ok &= ns2501_writeb(dvo, 0x1c, 0x54);
+ ok &= ns2501_writeb(dvo, 0x1d, 0x03);
+
+ ok &= ns2501_writeb(dvo, 0x34, 0x03);
+ ok &= ns2501_writeb(dvo, 0x35, 0xff);
+
+ ok &= ns2501_writeb(dvo, 0x80, 0xff);
+ ok &= ns2501_writeb(dvo, 0x81, 0x07);
+ ok &= ns2501_writeb(dvo, 0x82, 0x3d);
+ ok &= ns2501_writeb(dvo, 0x83, 0x05);
+
+ ok &= ns2501_writeb(dvo, 0x8d, 0x02);
+ ok &= ns2501_writeb(dvo, 0x8e, 0x10);
+ ok &= ns2501_writeb(dvo, 0x8f, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0x90, 0xff); /* vertical */
+ ok &= ns2501_writeb(dvo, 0x91, 0x07);
+ ok &= ns2501_writeb(dvo, 0x94, 0x00);
+ ok &= ns2501_writeb(dvo, 0x95, 0x00);
+
+ ok &= ns2501_writeb(dvo, 0x96, 0x05);
+
+ ok &= ns2501_writeb(dvo, 0x99, 0x00);
+ ok &= ns2501_writeb(dvo, 0x9a, 0x88);
+
+ ok &= ns2501_writeb(dvo, 0x9c, 0x24);
+ ok &= ns2501_writeb(dvo, 0x9d, 0x00);
+ ok &= ns2501_writeb(dvo, 0x9e, 0x25);
+ ok &= ns2501_writeb(dvo, 0x9f, 0x03);
+
+ ok &= ns2501_writeb(dvo, 0xa4, 0x84);
+
+ ok &= ns2501_writeb(dvo, 0xb6, 0x09);
+
+ ok &= ns2501_writeb(dvo, 0xb9, 0xa0); /* horizontal? */
+ ok &= ns2501_writeb(dvo, 0xba, 0x00); /* horizontal? */
+
+ ok &= ns2501_writeb(dvo, 0xc0, 0x05); /* horizontal? */
+ ok &= ns2501_writeb(dvo, 0xc1, 0x90);
+
+ ok &= ns2501_writeb(dvo, 0xc2, 0x00);
+ ok &= ns2501_writeb(dvo, 0xc3, 0x0f);
+
+ ok &= ns2501_writeb(dvo, 0xc4, 0x03);
+ ok &= ns2501_writeb(dvo, 0xc5, 0x16);
+
+ ok &= ns2501_writeb(dvo, 0xc6, 0x00);
+ ok &= ns2501_writeb(dvo, 0xc7, 0x02);
+ ok &= ns2501_writeb(dvo, 0xc8, 0x02);
+
+ } else if (mode->hdisplay == 1024 && mode->vdisplay == 768) {
+ /* mode 280 */
+ DRM_DEBUG_KMS("%s: switching to 1024x768\n",
+ __FUNCTION__);
+ /*
+ * This might or might not work, actually. I'm silently
+ * assuming here that the native panel resolution is
+ * 1024x768. If not, then this leaves the scaler disabled
+ * generating a picture that is likely not the expected.
+ *
+ * Problem is that I do not know where to take the panel
+ * dimensions from.
+ *
+ * Enable the bypass, scaling not required.
+ *
+ * The scaler registers are irrelevant here....
+ *
+ */
+ ns->reg_8_shadow |= NS2501_8_BPAS;
+ ok &= ns2501_writeb(dvo, 0x37, 0x44);
+ } else {
+ /*
+ * Data not known. Bummer!
+ * Hopefully, the code should not go here
+ * as mode_OK delivered no other modes.
+ */
+ ns->reg_8_shadow |= NS2501_8_BPAS;
+ }
+ ok &= ns2501_writeb(dvo, NS2501_REG8, ns->reg_8_shadow);
+
+ if (!ok) {
+ if (restore)
+ restore_dvo(dvo);
+ enable_dvo(dvo);
+ restore = true;
+ }
+ } while (!ok);
+ /*
+ * Restore the old i915 registers before
+ * forcing the ns2501 on.
+ */
+ if (restore)
+ restore_dvo(dvo);
+}
+
+/* set the NS2501 power state */
+static bool ns2501_get_hw_state(struct intel_dvo_device *dvo)
+{
+ unsigned char ch;
+
+ if (!ns2501_readb(dvo, NS2501_REG8, &ch))
+ return false;
+
+ if (ch & NS2501_8_PD)
+ return true;
+ else
+ return false;
+}
+
+/* set the NS2501 power state */
+static void ns2501_dpms(struct intel_dvo_device *dvo, bool enable)
+{
+ bool ok;
+ bool restore = false;
+ struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);
+ unsigned char ch;
+
+ DRM_DEBUG_KMS("%s: Trying set the dpms of the DVO to %i\n",
+ __FUNCTION__, enable);
+
+ ch = ns->reg_8_shadow;
+
+ if (enable)
+ ch |= NS2501_8_PD;
+ else
+ ch &= ~NS2501_8_PD;
+
+ if (ns->reg_8_set == 0 || ns->reg_8_shadow != ch) {
+ ns->reg_8_set = 1;
+ ns->reg_8_shadow = ch;
+
+ do {
+ ok = true;
+ ok &= ns2501_writeb(dvo, NS2501_REG8, ch);
+ ok &=
+ ns2501_writeb(dvo, 0x34,
+ enable ? 0x03 : 0x00);
+ ok &=
+ ns2501_writeb(dvo, 0x35,
+ enable ? 0xff : 0x00);
+ if (!ok) {
+ if (restore)
+ restore_dvo(dvo);
+ enable_dvo(dvo);
+ restore = true;
+ }
+ } while (!ok);
+
+ if (restore)
+ restore_dvo(dvo);
+ }
+}
+
+static void ns2501_dump_regs(struct intel_dvo_device *dvo)
+{
+ uint8_t val;
+
+ ns2501_readb(dvo, NS2501_FREQ_LO, &val);
+ DRM_LOG_KMS("NS2501_FREQ_LO: 0x%02x\n", val);
+ ns2501_readb(dvo, NS2501_FREQ_HI, &val);
+ DRM_LOG_KMS("NS2501_FREQ_HI: 0x%02x\n", val);
+ ns2501_readb(dvo, NS2501_REG8, &val);
+ DRM_LOG_KMS("NS2501_REG8: 0x%02x\n", val);
+ ns2501_readb(dvo, NS2501_REG9, &val);
+ DRM_LOG_KMS("NS2501_REG9: 0x%02x\n", val);
+ ns2501_readb(dvo, NS2501_REGC, &val);
+ DRM_LOG_KMS("NS2501_REGC: 0x%02x\n", val);
+}
+
+static void ns2501_destroy(struct intel_dvo_device *dvo)
+{
+ struct ns2501_priv *ns = dvo->dev_priv;
+
+ if (ns) {
+ kfree(ns);
+ dvo->dev_priv = NULL;
+ }
+}
+
+struct intel_dvo_dev_ops ns2501_ops = {
+ .init = ns2501_init,
+ .detect = ns2501_detect,
+ .mode_valid = ns2501_mode_valid,
+ .mode_set = ns2501_mode_set,
+ .dpms = ns2501_dpms,
+ .get_hw_state = ns2501_get_hw_state,
+ .dump_regs = ns2501_dump_regs,
+ .destroy = ns2501_destroy,
+};
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-14 19:36:03 +0000