Re: [PATCH v2] drm/i915: FIFO space query code refactor

Mika Kuoppala
2015-02-20T09:34:39Z

Dave Gordon <david.s.gordon@intel.com> writes:

> When querying the GTFIFOCTL register to check the FIFO space, the read value
> must be masked. The operation is repeated explicitly in several places. This
> change refactors the read-and-mask code into a function call.
>
> v2: rebased on top of Mika's forcewake patch set, specifically:
> [PATCH 8/8] drm/i915: Enum forcewake domains and domain identifiers
>
> Change-Id: Id1a9f3785cb20b82d4caa330c37b31e4e384a3ef
> Signed-off-by: Dave Gordon <david.s.gordon@intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

> ---
> drivers/gpu/drm/i915/intel_uncore.c | 19 ++++++++++++-------
> 1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index 66365e7..a0331a7 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -205,6 +205,13 @@ static void fw_domains_put_with_fifo(struct drm_i915_private *dev_priv,
> gen6_gt_check_fifodbg(dev_priv);
> }
>
> +static inline u32 fifo_free_entries(struct drm_i915_private *dev_priv)
> +{
> + u32 count = __raw_i915_read32(dev_priv, GTFIFOCTL);
> +
> + return count & GT_FIFO_FREE_ENTRIES_MASK;
> +}
> +
> static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
> {
> int ret = 0;
> @@ -212,16 +219,15 @@ static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
> /* On VLV, FIFO will be shared by both SW and HW.
> * So, we need to read the FREE_ENTRIES everytime */
> if (IS_VALLEYVIEW(dev_priv->dev))
> - dev_priv->uncore.fifo_count =
> - __raw_i915_read32(dev_priv, GTFIFOCTL) &
> - GT_FIFO_FREE_ENTRIES_MASK;
> + dev_priv->uncore.fifo_count = fifo_free_entries(dev_priv);
>
> if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
> int loop = 500;
> - u32 fifo = __raw_i915_read32(dev_priv, GTFIFOCTL) & GT_FIFO_FREE_ENTRIES_MASK;
> + u32 fifo = fifo_free_entries(dev_priv);
> +
> while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
> udelay(10);
> - fifo = __raw_i915_read32(dev_priv, GTFIFOCTL) & GT_FIFO_FREE_ENTRIES_MASK;
> + fifo = fifo_free_entries(dev_priv);
> }
> if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
> ++ret;
> @@ -277,8 +283,7 @@ void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore)
>
> if (IS_GEN6(dev) || IS_GEN7(dev))
> dev_priv->uncore.fifo_count =
> - __raw_i915_read32(dev_priv, GTFIFOCTL) &
> - GT_FIFO_FREE_ENTRIES_MASK;
> + fifo_free_entries(dev_priv);
> }
>
> spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
> --
> 1.7.9.5
>
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