[PATCH v3 16/43] drm/bridge: analogix_dp: Retry bridge enable when it failed

Thierry Escande
2018-01-30T20:37:24Z

From: zain wang <wzz@rock-chips.com>

When we enable bridge failed, we have to retry it, otherwise we would get
the abnormal display.

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>
---
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 179c2106b8a2..ba2506e17f6d 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)
@@ -922,7 +927,7 @@ 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;

@@ -932,11 +937,10 @@ 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);
@@ -957,6 +961,7 @@ 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;
}

/*
@@ -1150,12 +1155,9 @@ 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);

@@ -1163,11 +1165,46 @@ 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)
--
2.14.1