[PATCH 1/2] drm/i915: factor out intel_edp_panel_vdd_sanitize

[PATCH 1/2] drm/i915: factor out intel_edp_panel_vdd_sanitize

[Imre Deak]

This will be needed by an upcoming patch too that needs to sanitize the
VDD state during resume. The additional async disabling is only needed
for the resume path, here it doesn't make a difference since we enable
VDD right after the sanitize call.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c  | 59 ++++++++++++++++++++++++++++------------
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 2 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b5ec489..a40d914 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1234,6 +1234,19 @@ static void edp_panel_vdd_work(struct work_struct *__work)
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
 }
 
+static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
+{
+	unsigned long delay;
+
+	/*
+	 * Queue the timer to fire a long time from now (relative to the power
+	 * down delay) to keep the panel power up across a sequence of
+	 * operations.
+	 */
+	delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
+	schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
+}
+
 static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
 {
 	if (!is_edp(intel_dp))
@@ -1243,17 +1256,10 @@ static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
 
 	intel_dp->want_panel_vdd = false;
 
-	if (sync) {
+	if (sync)
 		edp_panel_vdd_off_sync(intel_dp);
-	} else {
-		/*
-		 * Queue the timer to fire a long
-		 * time from now (relative to the power down delay)
-		 * to keep the panel power up across a sequence of operations
-		 */
-		schedule_delayed_work(&intel_dp->panel_vdd_work,
-				      msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
-	}
+	else
+		edp_panel_vdd_schedule_off(intel_dp);
 }
 
 void intel_edp_panel_on(struct intel_dp *intel_dp)
@@ -4179,6 +4185,31 @@ intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
 	return downclock_mode;
 }
 
+void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
+	struct drm_device *dev = intel_encoder->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum intel_display_power_domain power_domain;
+
+	if (intel_encoder->type != INTEL_OUTPUT_EDP)
+		return;
+
+	if (!edp_have_panel_vdd(intel_dp))
+		return;
+	/*
+	 * The VDD bit needs a power domain reference, so if the bit is
+	 * already enabled when we boot or resume, grab this reference and
+	 * schedule a vdd off, so we don't hold on to the reference
+	 * indefinitely.
+	 */
+	DRM_DEBUG_KMS("VDD left on by BIOS, adjusting state tracking\n");
+	power_domain = intel_display_port_power_domain(intel_encoder);
+	intel_display_power_get(dev_priv, power_domain);
+
+	edp_panel_vdd_schedule_off(intel_dp);
+}
+
 static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 				     struct intel_connector *intel_connector,
 				     struct edp_power_seq *power_seq)
@@ -4199,13 +4230,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	if (!is_edp(intel_dp))
 		return true;
 
-	/* The VDD bit needs a power domain reference, so if the bit is already
-	 * enabled when we boot, grab this reference. */
-	if (edp_have_panel_vdd(intel_dp)) {
-		enum intel_display_power_domain power_domain;
-		power_domain = intel_display_port_power_domain(intel_encoder);
-		intel_display_power_get(dev_priv, power_domain);
-	}
+	intel_edp_panel_vdd_sanitize(intel_encoder);
 
 	/* Cache DPCD and EDID for edp. */
 	intel_edp_panel_vdd_on(intel_dp);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 5f7c7bd..150c09b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -855,6 +855,7 @@ bool intel_dp_is_edp(struct drm_device *dev, enum port port);
 void intel_edp_backlight_on(struct intel_dp *intel_dp);
 void intel_edp_backlight_off(struct intel_dp *intel_dp);
 void intel_edp_panel_vdd_on(struct intel_dp *intel_dp);
+void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder);
 void intel_edp_panel_on(struct intel_dp *intel_dp);
 void intel_edp_panel_off(struct intel_dp *intel_dp);
 void intel_edp_psr_enable(struct intel_dp *intel_dp);
-- 
1.8.4

[PATCH 2/2] drm/i915: fix VDD state tracking after system resume

[Imre Deak]

Just like during booting the BIOS can leave the VDD bit enabled after
system resume. So apply the same state sanitization there too. This
fixes a problem where after resume the port power domain refcount gets
unbalanced.

Reported-by: Jarkko Nikula <jarkko.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 065984d..8989069 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12875,6 +12875,12 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 	/* HW state is read out, now we need to sanitize this mess. */
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
 			    base.head) {
+		/*
+		 * Do the following only during resume, since at driver
+		 * loading it's done early when initializing the encoder.
+		 */
+		if (force_restore)
+			intel_edp_panel_vdd_sanitize(encoder);
 		intel_sanitize_encoder(encoder);
 	}
 
-- 
1.8.4

Re: [PATCH 1/2] drm/i915: factor out intel_edp_panel_vdd_sanitize

[Ville Syrjälä]

On Fri, Jun 27, 2014 at 09:35:13PM +0300, Imre Deak wrote:
> This will be needed by an upcoming patch too that needs to sanitize the
> VDD state during resume. The additional async disabling is only needed
> for the resume path, here it doesn't make a difference since we enable
> VDD right after the sanitize call.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c  | 59 ++++++++++++++++++++++++++++------------
>  drivers/gpu/drm/i915/intel_drv.h |  1 +
>  2 files changed, 43 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index b5ec489..a40d914 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1234,6 +1234,19 @@ static void edp_panel_vdd_work(struct work_struct *__work)
>  	drm_modeset_unlock(&dev->mode_config.connection_mutex);
>  }
>  
> +static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
> +{
> +	unsigned long delay;
> +
> +	/*
> +	 * Queue the timer to fire a long time from now (relative to the power
> +	 * down delay) to keep the panel power up across a sequence of
> +	 * operations.
> +	 */
> +	delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
> +	schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
> +}
> +
>  static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
>  {
>  	if (!is_edp(intel_dp))
> @@ -1243,17 +1256,10 @@ static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
>  
>  	intel_dp->want_panel_vdd = false;
>  
> -	if (sync) {
> +	if (sync)
>  		edp_panel_vdd_off_sync(intel_dp);
> -	} else {
> -		/*
> -		 * Queue the timer to fire a long
> -		 * time from now (relative to the power down delay)
> -		 * to keep the panel power up across a sequence of operations
> -		 */
> -		schedule_delayed_work(&intel_dp->panel_vdd_work,
> -				      msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
> -	}
> +	else
> +		edp_panel_vdd_schedule_off(intel_dp);
>  }
>  
>  void intel_edp_panel_on(struct intel_dp *intel_dp)
> @@ -4179,6 +4185,31 @@ intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
>  	return downclock_mode;
>  }
>  
> +void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder)
> +{
> +	struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
> +	struct drm_device *dev = intel_encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	enum intel_display_power_domain power_domain;
> +
> +	if (intel_encoder->type != INTEL_OUTPUT_EDP)
> +		return;

I'd move the intel_dp assignment after the encoder type check to avoid
anyone thinking that they're allowed to dereference it before we're
sure about the type.

Apart from that both patches are:
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +
> +	if (!edp_have_panel_vdd(intel_dp))
> +		return;
> +	/*
> +	 * The VDD bit needs a power domain reference, so if the bit is
> +	 * already enabled when we boot or resume, grab this reference and
> +	 * schedule a vdd off, so we don't hold on to the reference
> +	 * indefinitely.
> +	 */
> +	DRM_DEBUG_KMS("VDD left on by BIOS, adjusting state tracking\n");
> +	power_domain = intel_display_port_power_domain(intel_encoder);
> +	intel_display_power_get(dev_priv, power_domain);
> +
> +	edp_panel_vdd_schedule_off(intel_dp);
> +}
> +
>  static bool intel_edp_init_connector(struct intel_dp *intel_dp,
>  				     struct intel_connector *intel_connector,
>  				     struct edp_power_seq *power_seq)
> @@ -4199,13 +4230,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
>  	if (!is_edp(intel_dp))
>  		return true;
>  
> -	/* The VDD bit needs a power domain reference, so if the bit is already
> -	 * enabled when we boot, grab this reference. */
> -	if (edp_have_panel_vdd(intel_dp)) {
> -		enum intel_display_power_domain power_domain;
> -		power_domain = intel_display_port_power_domain(intel_encoder);
> -		intel_display_power_get(dev_priv, power_domain);
> -	}
> +	intel_edp_panel_vdd_sanitize(intel_encoder);
>  
>  	/* Cache DPCD and EDID for edp. */
>  	intel_edp_panel_vdd_on(intel_dp);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 5f7c7bd..150c09b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -855,6 +855,7 @@ bool intel_dp_is_edp(struct drm_device *dev, enum port port);
>  void intel_edp_backlight_on(struct intel_dp *intel_dp);
>  void intel_edp_backlight_off(struct intel_dp *intel_dp);
>  void intel_edp_panel_vdd_on(struct intel_dp *intel_dp);
> +void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder);
>  void intel_edp_panel_on(struct intel_dp *intel_dp);
>  void intel_edp_panel_off(struct intel_dp *intel_dp);
>  void intel_edp_psr_enable(struct intel_dp *intel_dp);
> -- 
> 1.8.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC