Re: [PATCH v5 10/36] drm/bridge: analogix_dp: Retry bridge enable when it failed

Archit Taneja
2018-03-14T06:07:36Z

On Saturday 10 March 2018 03:53 AM, Enric Balletbo i Serra wrote:
> From: zain wang <wzz@rock-chips.com>
>
> When we enable bridge failed, we have to retry it, otherwise we would get
> the abnormal display.
>

Reviewed-by: Archit Taneja <architt@codeaurora.org>

Thanks,
Archit

> Cc: Stéphane Marchesin <marcheu@chromium.org>
> Signed-off-by: zain wang <wzz@rock-chips.com>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 65 +++++++++++++++++-----
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 3 +-
> drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 5 +-
> 3 files changed, 56 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index ea7a80a989c6..c81733b8185e 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -43,8 +43,10 @@ struct bridge_init {
> struct device_node *node;
> };
>
> -static void analogix_dp_init_dp(struct analogix_dp_device *dp)
> +static int analogix_dp_init_dp(struct analogix_dp_device *dp)
> {
> + int ret;
> +
> analogix_dp_reset(dp);
>
> analogix_dp_swreset(dp);
> @@ -56,10 +58,13 @@ static void analogix_dp_init_dp(struct analogix_dp_device *dp)
> analogix_dp_enable_sw_function(dp);
>
> analogix_dp_config_interrupt(dp);
> - analogix_dp_init_analog_func(dp);
> + ret = analogix_dp_init_analog_func(dp);
> + if (ret)
> + return ret;
>
> analogix_dp_init_hpd(dp);
> analogix_dp_init_aux(dp);
> + return 0;
> }
>
> static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
> @@ -918,7 +923,7 @@ static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
> return IRQ_HANDLED;
> }
>
> -static void analogix_dp_commit(struct analogix_dp_device *dp)
> +static int analogix_dp_commit(struct analogix_dp_device *dp)
> {
> int ret;
>
> @@ -928,11 +933,10 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
> DRM_ERROR("failed to disable the panel\n");
> }
>
> - ret = readx_poll_timeout(analogix_dp_train_link, dp, ret, !ret, 100,
> - DP_TIMEOUT_TRAINING_US * 5);
> + ret = analogix_dp_train_link(dp);
> if (ret) {
> dev_err(dp->dev, "unable to do link train, ret=%d\n", ret);
> - return;
> + return ret;
> }
>
> analogix_dp_enable_scramble(dp, 1);
> @@ -953,6 +957,7 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
> dp->psr_enable = analogix_dp_detect_sink_psr(dp);
> if (dp->psr_enable)
> analogix_dp_enable_sink_psr(dp);
> + return 0;
> }
>
> /*
> @@ -1149,12 +1154,9 @@ static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge)
> DRM_ERROR("failed to setup the panel ret = %d\n", ret);
> }
>
> -static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> +static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
> {
> - struct analogix_dp_device *dp = bridge->driver_private;
> -
> - if (dp->dpms_mode == DRM_MODE_DPMS_ON)
> - return;
> + int ret;
>
> pm_runtime_get_sync(dp->dev);
>
> @@ -1162,11 +1164,46 @@ static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> dp->plat_data->power_on(dp->plat_data);
>
> phy_power_on(dp->phy);
> - analogix_dp_init_dp(dp);
> +
> + ret = analogix_dp_init_dp(dp);
> + if (ret)
> + goto out_dp_init;
> +
> + ret = analogix_dp_commit(dp);
> + if (ret)
> + goto out_dp_init;
> +
> enable_irq(dp->irq);
> - analogix_dp_commit(dp);
> + return 0;
>
> - dp->dpms_mode = DRM_MODE_DPMS_ON;
> +out_dp_init:
> + phy_power_off(dp->phy);
> + if (dp->plat_data->power_off)
> + dp->plat_data->power_off(dp->plat_data);
> + pm_runtime_put_sync(dp->dev);
> +
> + return ret;
> +}
> +
> +static void analogix_dp_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct analogix_dp_device *dp = bridge->driver_private;
> + int timeout_loop = 0;
> +
> + if (dp->dpms_mode == DRM_MODE_DPMS_ON)
> + return;
> +
> + while (timeout_loop < MAX_PLL_LOCK_LOOP) {
> + if (analogix_dp_set_bridge(dp) == 0) {
> + dp->dpms_mode = DRM_MODE_DPMS_ON;
> + return;
> + }
> + dev_err(dp->dev, "failed to set bridge, retry: %d\n",
> + timeout_loop);
> + timeout_loop++;
> + usleep_range(10, 11);
> + }
> + dev_err(dp->dev, "too many times retry set bridge, give it up\n");
> }
>
> static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> index 403ff853464b..769255dc6e99 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> @@ -19,6 +19,7 @@
> #define DP_TIMEOUT_LOOP_COUNT 100
> #define MAX_CR_LOOP 5
> #define MAX_EQ_LOOP 5
> +#define MAX_PLL_LOCK_LOOP 5
>
> /* Training takes 22ms if AUX channel comm fails. Use this as retry interval */
> #define DP_TIMEOUT_TRAINING_US 22000
> @@ -197,7 +198,7 @@ void analogix_dp_set_pll_power_down(struct analogix_dp_device *dp, bool enable);
> void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp,
> enum analog_power_block block,
> bool enable);
> -void analogix_dp_init_analog_func(struct analogix_dp_device *dp);
> +int analogix_dp_init_analog_func(struct analogix_dp_device *dp);
> void analogix_dp_init_hpd(struct analogix_dp_device *dp);
> void analogix_dp_force_hpd(struct analogix_dp_device *dp);
> enum dp_irq_type analogix_dp_get_irq_type(struct analogix_dp_device *dp);
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index e78c861b9e06..b47c5af43560 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -333,7 +333,7 @@ void analogix_dp_set_analog_power_down(struct analogix_dp_device *dp,
> }
> }
>
> -void analogix_dp_init_analog_func(struct analogix_dp_device *dp)
> +int analogix_dp_init_analog_func(struct analogix_dp_device *dp)
> {
> u32 reg;
> int timeout_loop = 0;
> @@ -355,7 +355,7 @@ void analogix_dp_init_analog_func(struct analogix_dp_device *dp)
> timeout_loop++;
> if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
> dev_err(dp->dev, "failed to get pll lock status\n");
> - return;
> + return -ETIMEDOUT;
> }
> usleep_range(10, 20);
> }
> @@ -366,6 +366,7 @@ void analogix_dp_init_analog_func(struct analogix_dp_device *dp)
> reg &= ~(SERDES_FIFO_FUNC_EN_N | LS_CLK_DOMAIN_FUNC_EN_N
> | AUX_FUNC_EN_N);
> writel(reg, dp->reg_base + ANALOGIX_DP_FUNC_EN_2);
> + return 0;
> }
>
> void analogix_dp_clear_hotplug_interrupts(struct analogix_dp_device *dp)
>
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