On Mon, 15 Sep 2014, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> Originally the irq safe spinlock was required because of asle
> interrupts. But since
>
> commit 7bd688cd66db93f6430f6e2b3145ee5686daa315
> Author: Jani Nikula <jani.nikula@xxxxxxxxx>
> Date: Fri Nov 8 16:48:56 2013 +0200
>
> drm/i915: handle backlight through chip specific functions
I think
commit 91a60f20712179e56b7a6c3d332a5f6f9a54aa11
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Thu Oct 31 18:55:48 2013 +0200
drm/i915: move opregion asle request handling to a work queue
is probably more accurate.
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> there's no need for this any more. So switch to the simpler mutex.
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_dma.c | 2 +-
> drivers/gpu/drm/i915/i915_drv.h | 2 +-
> drivers/gpu/drm/i915/intel_panel.c | 30 ++++++++++++------------------
> 3 files changed, 14 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 1403b01e8216..0bc1583114e7 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1614,7 +1614,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
>
> spin_lock_init(&dev_priv->irq_lock);
> spin_lock_init(&dev_priv->gpu_error.lock);
> - spin_lock_init(&dev_priv->backlight_lock);
> + mutex_init(&dev_priv->backlight_lock);
> spin_lock_init(&dev_priv->uncore.lock);
> spin_lock_init(&dev_priv->mm.object_stat_lock);
> spin_lock_init(&dev_priv->mmio_flip_lock);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 17dfce0f4e68..07dafa2c2d8c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1528,7 +1528,7 @@ struct drm_i915_private {
> struct intel_overlay *overlay;
>
> /* backlight registers and fields in struct intel_panel */
> - spinlock_t backlight_lock;
> + struct mutex backlight_lock;
>
> /* LVDS info */
> bool no_aux_handshake;
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index 18784470a760..f17ada3742de 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -538,14 +538,13 @@ static u32 intel_panel_get_backlight(struct intel_connector *connector)
> struct drm_device *dev = connector->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> u32 val;
> - unsigned long flags;
>
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
>
> val = dev_priv->display.get_backlight(connector);
> val = intel_panel_compute_brightness(connector, val);
>
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
>
> DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);
> return val;
> @@ -629,12 +628,11 @@ static void intel_panel_set_backlight(struct intel_connector *connector,
> struct intel_panel *panel = &connector->panel;
> enum pipe pipe = intel_get_pipe_from_connector(connector);
> u32 hw_level;
> - unsigned long flags;
>
> if (!panel->backlight.present || pipe == INVALID_PIPE)
> return;
>
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
>
> WARN_ON(panel->backlight.max == 0);
>
> @@ -644,7 +642,7 @@ static void intel_panel_set_backlight(struct intel_connector *connector,
> if (panel->backlight.enabled)
> intel_panel_actually_set_backlight(connector, hw_level);
>
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
> }
>
> /* set backlight brightness to level in range [0..max], assuming hw min is
> @@ -658,12 +656,11 @@ void intel_panel_set_backlight_acpi(struct intel_connector *connector,
> struct intel_panel *panel = &connector->panel;
> enum pipe pipe = intel_get_pipe_from_connector(connector);
> u32 hw_level;
> - unsigned long flags;
>
> if (!panel->backlight.present || pipe == INVALID_PIPE)
> return;
>
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
>
> WARN_ON(panel->backlight.max == 0);
>
> @@ -679,7 +676,7 @@ void intel_panel_set_backlight_acpi(struct intel_connector *connector,
> if (panel->backlight.enabled)
> intel_panel_actually_set_backlight(connector, hw_level);
>
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
> }
>
> static void pch_disable_backlight(struct intel_connector *connector)
> @@ -733,7 +730,6 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> enum pipe pipe = intel_get_pipe_from_connector(connector);
> - unsigned long flags;
>
> if (!panel->backlight.present || pipe == INVALID_PIPE)
> return;
> @@ -749,14 +745,14 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
> return;
> }
>
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
>
> if (panel->backlight.device)
> panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
> panel->backlight.enabled = false;
> dev_priv->display.disable_backlight(connector);
>
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
> }
>
> static void bdw_enable_backlight(struct intel_connector *connector)
> @@ -937,14 +933,13 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> enum pipe pipe = intel_get_pipe_from_connector(connector);
> - unsigned long flags;
>
> if (!panel->backlight.present || pipe == INVALID_PIPE)
> return;
>
> DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
>
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
>
> WARN_ON(panel->backlight.max == 0);
>
> @@ -962,7 +957,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
> if (panel->backlight.device)
> panel->backlight.device->props.power = FB_BLANK_UNBLANK;
>
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
> }
>
> #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
> @@ -1267,7 +1262,6 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_connector *intel_connector = to_intel_connector(connector);
> struct intel_panel *panel = &intel_connector->panel;
> - unsigned long flags;
> int ret;
>
> if (!dev_priv->vbt.backlight.present) {
> @@ -1280,9 +1274,9 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
> }
>
> /* set level and max in panel struct */
> - spin_lock_irqsave(&dev_priv->backlight_lock, flags);
> + mutex_lock(&dev_priv->backlight_lock);
> ret = dev_priv->display.setup_backlight(intel_connector);
> - spin_unlock_irqrestore(&dev_priv->backlight_lock, flags);
> + mutex_unlock(&dev_priv->backlight_lock);
>
> if (ret) {
> DRM_DEBUG_KMS("failed to setup backlight for connector %s\n",
> --
> 1.9.3
>
--
Jani Nikula, Intel Open Source Technology Center
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