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SubjectRe: [PATCH 19/21] drm/i915: Asynchronous eDP panel power off
On Thu, Sep 29, 2011 at 06:09:51PM -0700, Keith Packard wrote:
> Using the same basic plan as the VDD force delayed power off, make
> turning the panel power off asynchronous.
>
> Signed-off-by: Keith Packard <keithp@keithp.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 71 +++++++++++++++++++++++++++++----------
> 1 files changed, 53 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 08817b0..7120ba7 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -62,8 +62,9 @@ struct intel_dp {
> int panel_power_up_delay;
> int panel_power_down_delay;
> struct drm_display_mode *panel_fixed_mode; /* for eDP */
> - struct delayed_work panel_vdd_work;
> + struct delayed_work panel_work;
> bool want_panel_vdd;
> + bool want_panel_power;
> unsigned long panel_off_jiffies;
> };
>
> @@ -906,7 +907,9 @@ static void ironlake_edp_panel_vdd_on(struct intel_dp *intel_dp)
> }
> }
>
> -static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
> +static void ironlake_edp_panel_off_sync(struct intel_dp *intel_dp);
> +
> +static void ironlake_edp_panel_vdd_off_sync(struct intel_dp *intel_dp)

If it's not too annoying to do, can you move this to the previous patch?
Dito for the s/panel_vdd_work/panel_work/.

> {
> struct drm_device *dev = intel_dp->base.base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -927,14 +930,15 @@ static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
> }
> }
>
> -static void ironlake_panel_vdd_work(struct work_struct *__work)
> +static void ironlake_panel_work(struct work_struct *__work)
> {
> struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
> - struct intel_dp, panel_vdd_work);
> + struct intel_dp, panel_work);
> struct drm_device *dev = intel_dp->base.base.dev;
>
> mutex_lock(&dev->struct_mutex);
> - ironlake_panel_vdd_off_sync(intel_dp);
> + ironlake_edp_panel_vdd_off_sync(intel_dp);
> + ironlake_edp_panel_off_sync(intel_dp);
> mutex_unlock(&dev->struct_mutex);
> }

Same comment as in the previous patch: I think the
intel_dp->want_panel_power check belongs into the work queue. We don't
want to hide the fact that we properly handle that race ;-)

>
> @@ -943,20 +947,20 @@ static void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
> if (!is_edp(intel_dp))
> return;
>
> - DRM_DEBUG_KMS("Turn eDP VDD off %d\n", intel_dp->want_panel_vdd);
> + DRM_DEBUG_KMS("Turn eDP VDD off %d\n", sync);
> WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");
>
> intel_dp->want_panel_vdd = false;
>
> if (sync) {
> - ironlake_panel_vdd_off_sync(intel_dp);
> + ironlake_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,
> + schedule_delayed_work(&intel_dp->panel_work,
> msecs_to_jiffies(intel_dp->panel_power_down_delay * 5));
> }
> }
> @@ -968,10 +972,16 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
> struct drm_i915_private *dev_priv = dev->dev_private;
> u32 pp, idle_on_mask = PP_ON | PP_SEQUENCE_STATE_ON_IDLE;
>
> - if (ironlake_edp_have_panel_power(intel_dp))
> + DRM_DEBUG_KMS("Turn eDP panel on\n");
> + if (ironlake_edp_have_panel_power(intel_dp)) {
> + DRM_DEBUG_KMS("eDP panel already on\n");
> return;
> + }
>
> ironlake_wait_panel_off(intel_dp);
> +
> + intel_dp->want_panel_power = true;
> +
> pp = I915_READ(PCH_PP_CONTROL);
> pp &= ~PANEL_UNLOCK_MASK;
> pp |= PANEL_UNLOCK_REGS;
> @@ -995,14 +1005,16 @@ static void ironlake_edp_panel_on (struct intel_dp *intel_dp)
> POSTING_READ(PCH_PP_CONTROL);
> }
>
> -static void ironlake_edp_panel_off(struct drm_encoder *encoder)
> +static void ironlake_edp_panel_off_sync(struct intel_dp *intel_dp)
> {
> - struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> - struct drm_device *dev = encoder->dev;
> + struct drm_device *dev = intel_dp->base.base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> u32 pp, idle_off_mask = PP_ON | PP_SEQUENCE_MASK |
> PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK;
>
> + if (intel_dp->want_panel_power || !ironlake_edp_have_panel_power(intel_dp))
> + return;
> +
> pp = I915_READ(PCH_PP_CONTROL);
> pp &= ~PANEL_UNLOCK_MASK;
> pp |= PANEL_UNLOCK_REGS;
> @@ -1026,6 +1038,28 @@ static void ironlake_edp_panel_off(struct drm_encoder *encoder)
> intel_dp->panel_off_jiffies = jiffies;
> }
>
> +static void ironlake_edp_panel_off(struct drm_encoder *encoder, bool sync)
> +{
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
> + DRM_DEBUG_KMS("Turn eDP panel off %d\n", sync);
> +
> + intel_dp->want_panel_power = false;
> +
> + if (sync)
> + ironlake_edp_panel_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_work,
> + msecs_to_jiffies(intel_dp->panel_power_down_delay * 5));
> + }
> +
> +}
> +
> static void ironlake_edp_backlight_on (struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -1121,7 +1155,7 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
>
> if (is_edp(intel_dp)) {
> ironlake_edp_backlight_off(dev);
> - ironlake_edp_panel_off(encoder);
> + ironlake_edp_panel_off(encoder, false);
> if (!is_pch_edp(intel_dp))
> ironlake_edp_pll_on(encoder);
> else
> @@ -1165,7 +1199,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
> intel_dp_sink_dpms(intel_dp, mode);
> intel_dp_link_down(intel_dp);
> if (is_edp(intel_dp))
> - ironlake_edp_panel_off(encoder);
> + ironlake_edp_panel_off(encoder, true);
> if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
> ironlake_edp_pll_off(encoder);
> } else {
> @@ -2016,8 +2050,9 @@ static void intel_dp_encoder_destroy(struct drm_encoder *encoder)
> i2c_del_adapter(&intel_dp->adapter);
> drm_encoder_cleanup(encoder);
> if (is_edp(intel_dp)) {
> - cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
> - ironlake_panel_vdd_off_sync(intel_dp);
> + cancel_delayed_work_sync(&intel_dp->panel_work);
> + ironlake_edp_panel_vdd_off_sync(intel_dp);
> + ironlake_edp_panel_off_sync(intel_dp);
> }
> kfree(intel_dp);
> }
> @@ -2157,8 +2192,8 @@ intel_dp_init(struct drm_device *dev, int output_reg)
>
> if (is_edp(intel_dp)) {
> intel_encoder->clone_mask = (1 << INTEL_EDP_CLONE_BIT);
> - INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
> - ironlake_panel_vdd_work);
> + INIT_DELAYED_WORK(&intel_dp->panel_work,
> + ironlake_panel_work);
> }
>
> intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
> --
> 1.7.6.3
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48


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