diff options
Diffstat (limited to 'drivers/serial/serial_mtk.c')
| -rw-r--r-- | drivers/serial/serial_mtk.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/serial/serial_mtk.c b/drivers/serial/serial_mtk.c index 3f569c68f22..becf9317076 100644 --- a/drivers/serial/serial_mtk.c +++ b/drivers/serial/serial_mtk.c @@ -10,6 +10,7 @@ #include <config.h> #include <div64.h> #include <dm.h> +#include <dm/device.h> #include <dm/device_compat.h> #include <errno.h> #include <log.h> @@ -76,15 +77,19 @@ struct mtk_serial_regs { * driver * @regs: Register base of the serial port * @clk: The baud clock device + * @clk_bus: The bus clock device * @fixed_clk_rate: Fallback fixed baud clock rate if baud clock * device is not specified * @force_highspeed: Force using high-speed mode + * @upstream_highspeed_logic: Apply upstream high-speed logic */ struct mtk_serial_priv { struct mtk_serial_regs __iomem *regs; struct clk clk; + struct clk clk_bus; u32 fixed_clk_rate; bool force_highspeed; + bool upstream_highspeed_logic; }; static void _mtk_serial_setbrg(struct mtk_serial_priv *priv, int baud, @@ -111,7 +116,12 @@ static void _mtk_serial_setbrg(struct mtk_serial_priv *priv, int baud, goto set_baud; } - if (priv->force_highspeed) + /* + * Upstream linux use highspeed for anything >= 115200 and lowspeed + * for < 115200. Simulate this if we are using the upstream compatible. + */ + if (priv->force_highspeed || + (priv->upstream_highspeed_logic && baud >= 115200)) goto use_hs3; if (baud <= 115200) { @@ -220,6 +230,10 @@ static int mtk_serial_probe(struct udevice *dev) writel(UART_MCRVAL, &priv->regs->mcr); writel(UART_FCRVAL, &priv->regs->fcr); + clk_enable(&priv->clk); + if (priv->clk_bus.dev) + clk_enable(&priv->clk_bus); + return 0; } @@ -250,7 +264,11 @@ static int mtk_serial_of_to_plat(struct udevice *dev) } } + clk_get_by_name(dev, "bus", &priv->clk_bus); + priv->force_highspeed = dev_read_bool(dev, "mediatek,force-highspeed"); + priv->upstream_highspeed_logic = + device_is_compatible(dev, "mediatek,mt6577-uart"); return 0; } |