Re: [PATCH 05/19] drm/i915: add initial Runtime PM functions

[Imre Deak <imre.deak@intel.com>]

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On Thu, 2013-11-21 at 13:47 -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
> 
> This patch adds the initial infrastructure to allow a Runtime PM
> implementation that sets the device to its D3 state. The patch just
> adds the necessary callbacks and the initial infrastructure.
> 
> We still don't have any platform that actually uses this
> infrastructure, we still don't call get/put in all the places we need
> to, and we don't have any function to save/restore the state of the
> registers. This is not a problem since no platform uses the code added
> by this patch. We have a few people simultaneously working on runtime
> PM, so this initial code could help everybody make their plans.
> 
> V2: - Move some functions to intel_pm.c
>     - Remove useless pm_runtime_allow() call at init
>     - Remove useless pm_runtime_mark_last_busy() call at get
>     - Use pm_runtime_get_sync() instead of 2 calls
>     - Add a WARN to check if we're really awake
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_dma.c     |  6 ++++
>  drivers/gpu/drm/i915/i915_drv.c     | 42 ++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_drv.h     |  7 +++++
>  drivers/gpu/drm/i915/intel_drv.h    |  4 +++
>  drivers/gpu/drm/i915/intel_pm.c     | 56 +++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_uncore.c |  9 ++++++
>  6 files changed, 124 insertions(+)
> [...]
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 6bd0fc6..ef5e274 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -31,6 +31,7 @@
>  #include "../../../platform/x86/intel_ips.h"
>  #include <linux/module.h>
>  #include <drm/i915_powerwell.h>
> +#include <linux/pm_runtime.h>
>  
>  /**
>   * RC6 is a special power stage which allows the GPU to enter an very
> @@ -5878,6 +5879,61 @@ void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv)
>  	hsw_enable_package_c8(dev_priv);
>  }
>  
> +void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
> +{
> +	struct drm_device *dev = dev_priv->dev;
> +	struct device *device = &dev->pdev->dev;
> +
> +	if (!HAS_RUNTIME_PM(dev))
> +		return;
> +
> +	pm_runtime_get_sync(device);
> +	WARN(dev_priv->pm.suspended, "Device still suspended.\n");
> +}
> +
> +void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
> +{
> +	struct drm_device *dev = dev_priv->dev;
> +	struct device *device = &dev->pdev->dev;
> +
> +	if (!HAS_RUNTIME_PM(dev))
> +		return;
> +
> +	pm_runtime_mark_last_busy(device);
> +	pm_runtime_put_autosuspend(device);
> +}
> +
> +void intel_init_runtime_pm(struct drm_i915_private *dev_priv)
> +{
> +	struct drm_device *dev = dev_priv->dev;
> +	struct device *device = &dev->pdev->dev;
> +
> +	dev_priv->pm.suspended = false;
> +
> +	if (!HAS_RUNTIME_PM(dev))
> +		return;
> +
> +	pm_runtime_set_active(device);
> +	pm_runtime_enable(device);

This will generate a warning as you get here with an already enabled
state.

--Imre

> +	pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
> +	pm_runtime_mark_last_busy(device);
> +	pm_runtime_use_autosuspend(device);
> +}
> +
> +void intel_fini_runtime_pm(struct drm_i915_private *dev_priv)
> +{
> +	struct drm_device *dev = dev_priv->dev;
> +	struct device *device = &dev->pdev->dev;
> +
> +	if (!HAS_RUNTIME_PM(dev))
> +		return;
> +
> +	/* Make sure we're not suspended first. */
> +	pm_runtime_get_sync(device);
> +	pm_runtime_disable(device);
> +}
> +
>  /* Set up chip specific power management-related functions */
>  void intel_init_pm(struct drm_device *dev)
>  {
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index eac5661..ddd9084 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -346,6 +346,13 @@ hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
>  	}
>  }
>  
> +static void
> +assert_device_not_suspended(struct drm_i915_private *dev_priv)
> +{
> +	WARN(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended,
> +	     "Device suspended\n");
> +}
> +
>  #define REG_READ_HEADER(x) \
>  	unsigned long irqflags; \
>  	u##x val = 0; \
> @@ -438,6 +445,7 @@ gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace
>  	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
>  		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
>  	} \
> +	assert_device_not_suspended(dev_priv); \
>  	__raw_i915_write##x(dev_priv, reg, val); \
>  	if (unlikely(__fifo_ret)) { \
>  		gen6_gt_check_fifodbg(dev_priv); \
> @@ -453,6 +461,7 @@ hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace)
>  	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
>  		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
>  	} \
> +	assert_device_not_suspended(dev_priv); \
>  	hsw_unclaimed_reg_clear(dev_priv, reg); \
>  	__raw_i915_write##x(dev_priv, reg, val); \
>  	if (unlikely(__fifo_ret)) { \


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