[v3,3/3] drm/bridge: analogix_dp: detect Sink PSR state after configuring the PSR
diff mbox

Message ID 1473414302-390-1-git-send-email-ykk@rock-chips.com
State New
Headers show

Commit Message

Yakir Yang Sept. 9, 2016, 9:45 a.m. UTC
Make sure the request PSR state takes effect in analogix_dp_send_psr_spd()
function, or print the sink PSR error state if we failed to apply the
requested PSR setting.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---
Changes in v3:
- Update commit message
- Add DP_TIMEOUT_PSR_LOOP_MS marcos
- Correct the return values of analogix_dp_send_psr_spd()

Changes in v2:
- A bunch of good fixes from Sean

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c |  6 ++----
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  5 +++--
 drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  | 25 ++++++++++++++++++++--
 3 files changed, 28 insertions(+), 8 deletions(-)

Comments

Sean Paul Sept. 12, 2016, 1:52 p.m. UTC | #1
On Fri, Sep 9, 2016 at 5:45 AM, Yakir Yang <ykk@rock-chips.com> wrote:
> Make sure the request PSR state takes effect in analogix_dp_send_psr_spd()
> function, or print the sink PSR error state if we failed to apply the
> requested PSR setting.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> ---
> Changes in v3:
> - Update commit message
> - Add DP_TIMEOUT_PSR_LOOP_MS marcos
> - Correct the return values of analogix_dp_send_psr_spd()
>
> Changes in v2:
> - A bunch of good fixes from Sean
>
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c |  6 ++----
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  5 +++--
>  drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  | 25 ++++++++++++++++++++--
>  3 files changed, 28 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 5fe3982..c0ce16a 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -116,8 +116,7 @@ int analogix_dp_enable_psr(struct device *dev)
>         psr_vsc.DB0 = 0;
>         psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
>
> -       analogix_dp_send_psr_spd(dp, &psr_vsc);
> -       return 0;
> +       return analogix_dp_send_psr_spd(dp, &psr_vsc);
>  }
>  EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
>
> @@ -139,8 +138,7 @@ int analogix_dp_disable_psr(struct device *dev)
>         psr_vsc.DB0 = 0;
>         psr_vsc.DB1 = 0;
>
> -       analogix_dp_send_psr_spd(dp, &psr_vsc);
> -       return 0;
> +       return analogix_dp_send_psr_spd(dp, &psr_vsc);
>  }
>  EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> index d564e90..a27f1e3 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> @@ -20,6 +20,7 @@
>  #define MAX_EQ_LOOP 5
>
>  #define DP_TIMEOUT_LOOP_MS                     msecs_to_jiffies(1)
> +#define DP_TIMEOUT_PSR_LOOP_MS                 msecs_to_jiffies(300)

Same comment here re: units.

300ms seems like a really long time. Why does it take this long?

Sean


>
>  /* DP_MAX_LANE_COUNT */
>  #define DPCD_ENHANCED_FRAME_CAP(x)             (((x) >> 7) & 0x1)
> @@ -248,8 +249,8 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp);
>  void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
>  void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
>  void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
> -                             struct edp_vsc_psr *vsc);
> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
> +                            struct edp_vsc_psr *vsc);
>  ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>                              struct drm_dp_aux_msg *msg);
>  #endif /* _ANALOGIX_DP_CORE_H */
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 15a4cf0..7fd4ed0 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -1004,10 +1004,12 @@ void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
>         writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
>  }
>
> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
> -                             struct edp_vsc_psr *vsc)
> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
> +                            struct edp_vsc_psr *vsc)
>  {
> +       unsigned long timeout;
>         unsigned int val;
> +       u8 sink;
>
>         /* don't send info frame */
>         val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
> @@ -1048,6 +1050,25 @@ void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>         val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>         val |= IF_EN;
>         writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
> +
> +       timeout = jiffies + DP_TIMEOUT_PSR_LOOP_MS;
> +       while (time_before(jiffies, timeout)) {
> +               val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
> +               if (val != 1) {
> +                       dev_err(dp->dev, "PSR_STATUS read failed ret=%d", val);
> +                       return -EBUSY;
> +               }
> +
> +               if ((vsc->DB1 && sink == DP_PSR_SINK_ACTIVE_RFB) ||
> +                   (!vsc->DB1 && sink == DP_PSR_SINK_INACTIVE))
> +                       return 0;
> +
> +               usleep_range(1000, 1500);
> +       }
> +
> +       dev_warn(dp->dev, "Failed to apply PSR, sink state was [%x]", sink);
> +
> +       return -ETIMEDOUT;
>  }
>
>  ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
> --
> 1.9.1
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
Yakir Yang Sept. 20, 2016, 2:22 a.m. UTC | #2
Hi Sean,

On 09/12/2016 09:52 PM, Sean Paul wrote:
> On Fri, Sep 9, 2016 at 5:45 AM, Yakir Yang <ykk@rock-chips.com> wrote:
>> Make sure the request PSR state takes effect in analogix_dp_send_psr_spd()
>> function, or print the sink PSR error state if we failed to apply the
>> requested PSR setting.
>>
>> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
>> ---
>> Changes in v3:
>> - Update commit message
>> - Add DP_TIMEOUT_PSR_LOOP_MS marcos
>> - Correct the return values of analogix_dp_send_psr_spd()
>>
>> Changes in v2:
>> - A bunch of good fixes from Sean
>>
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.c |  6 ++----
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  5 +++--
>>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  | 25 ++++++++++++++++++++--
>>   3 files changed, 28 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index 5fe3982..c0ce16a 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -116,8 +116,7 @@ int analogix_dp_enable_psr(struct device *dev)
>>          psr_vsc.DB0 = 0;
>>          psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
>>
>> -       analogix_dp_send_psr_spd(dp, &psr_vsc);
>> -       return 0;
>> +       return analogix_dp_send_psr_spd(dp, &psr_vsc);
>>   }
>>   EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
>>
>> @@ -139,8 +138,7 @@ int analogix_dp_disable_psr(struct device *dev)
>>          psr_vsc.DB0 = 0;
>>          psr_vsc.DB1 = 0;
>>
>> -       analogix_dp_send_psr_spd(dp, &psr_vsc);
>> -       return 0;
>> +       return analogix_dp_send_psr_spd(dp, &psr_vsc);
>>   }
>>   EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> index d564e90..a27f1e3 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> @@ -20,6 +20,7 @@
>>   #define MAX_EQ_LOOP 5
>>
>>   #define DP_TIMEOUT_LOOP_MS                     msecs_to_jiffies(1)
>> +#define DP_TIMEOUT_PSR_LOOP_MS                 msecs_to_jiffies(300)
> Same comment here re: units.
>
> 300ms seems like a really long time. Why does it take this long?

This magic number '300ms' just come from my test, I haven't found the 
description in eDP 1.4a Spec about what exact time should Sink take to 
entry PSR.

- Yakir

> Sean
>
>
>>   /* DP_MAX_LANE_COUNT */
>>   #define DPCD_ENHANCED_FRAME_CAP(x)             (((x) >> 7) & 0x1)
>> @@ -248,8 +249,8 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp);
>>   void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
>>   void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
>>   void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
>> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> -                             struct edp_vsc_psr *vsc);
>> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> +                            struct edp_vsc_psr *vsc);
>>   ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>>                               struct drm_dp_aux_msg *msg);
>>   #endif /* _ANALOGIX_DP_CORE_H */
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> index 15a4cf0..7fd4ed0 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> @@ -1004,10 +1004,12 @@ void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
>>          writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
>>   }
>>
>> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> -                             struct edp_vsc_psr *vsc)
>> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> +                            struct edp_vsc_psr *vsc)
>>   {
>> +       unsigned long timeout;
>>          unsigned int val;
>> +       u8 sink;
>>
>>          /* don't send info frame */
>>          val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> @@ -1048,6 +1050,25 @@ void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>>          val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>>          val |= IF_EN;
>>          writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +
>> +       timeout = jiffies + DP_TIMEOUT_PSR_LOOP_MS;
>> +       while (time_before(jiffies, timeout)) {
>> +               val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
>> +               if (val != 1) {
>> +                       dev_err(dp->dev, "PSR_STATUS read failed ret=%d", val);
>> +                       return -EBUSY;
>> +               }
>> +
>> +               if ((vsc->DB1 && sink == DP_PSR_SINK_ACTIVE_RFB) ||
>> +                   (!vsc->DB1 && sink == DP_PSR_SINK_INACTIVE))
>> +                       return 0;
>> +
>> +               usleep_range(1000, 1500);
>> +       }
>> +
>> +       dev_warn(dp->dev, "Failed to apply PSR, sink state was [%x]", sink);
>> +
>> +       return -ETIMEDOUT;
>>   }
>>
>>   ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>> --
>> 1.9.1
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>

Patch
diff mbox

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 5fe3982..c0ce16a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -116,8 +116,7 @@  int analogix_dp_enable_psr(struct device *dev)
 	psr_vsc.DB0 = 0;
 	psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
 
-	analogix_dp_send_psr_spd(dp, &psr_vsc);
-	return 0;
+	return analogix_dp_send_psr_spd(dp, &psr_vsc);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
 
@@ -139,8 +138,7 @@  int analogix_dp_disable_psr(struct device *dev)
 	psr_vsc.DB0 = 0;
 	psr_vsc.DB1 = 0;
 
-	analogix_dp_send_psr_spd(dp, &psr_vsc);
-	return 0;
+	return analogix_dp_send_psr_spd(dp, &psr_vsc);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
 
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index d564e90..a27f1e3 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -20,6 +20,7 @@ 
 #define MAX_EQ_LOOP 5
 
 #define DP_TIMEOUT_LOOP_MS			msecs_to_jiffies(1)
+#define DP_TIMEOUT_PSR_LOOP_MS			msecs_to_jiffies(300)
 
 /* DP_MAX_LANE_COUNT */
 #define DPCD_ENHANCED_FRAME_CAP(x)		(((x) >> 7) & 0x1)
@@ -248,8 +249,8 @@  void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp);
 void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
 void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
 void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
-void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
-			      struct edp_vsc_psr *vsc);
+int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
+			     struct edp_vsc_psr *vsc);
 ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
 			     struct drm_dp_aux_msg *msg);
 #endif /* _ANALOGIX_DP_CORE_H */
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 15a4cf0..7fd4ed0 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -1004,10 +1004,12 @@  void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
 	writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
 }
 
-void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
-			      struct edp_vsc_psr *vsc)
+int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
+			     struct edp_vsc_psr *vsc)
 {
+	unsigned long timeout;
 	unsigned int val;
+	u8 sink;
 
 	/* don't send info frame */
 	val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
@@ -1048,6 +1050,25 @@  void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
 	val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
 	val |= IF_EN;
 	writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
+
+	timeout = jiffies + DP_TIMEOUT_PSR_LOOP_MS;
+	while (time_before(jiffies, timeout)) {
+		val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
+		if (val != 1) {
+			dev_err(dp->dev, "PSR_STATUS read failed ret=%d", val);
+			return -EBUSY;
+		}
+
+		if ((vsc->DB1 && sink == DP_PSR_SINK_ACTIVE_RFB) ||
+		    (!vsc->DB1 && sink == DP_PSR_SINK_INACTIVE))
+			return 0;
+
+		usleep_range(1000, 1500);
+	}
+
+	dev_warn(dp->dev, "Failed to apply PSR, sink state was [%x]", sink);
+
+	return -ETIMEDOUT;
 }
 
 ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,