Re: Fwd: [PATCH 2/2] drm/i915: Drop the forcewake count inc/dec around register read on VLV

["S, Deepak" <deepak.s@intel.com>]

On Wed, Jan 29, 2014 at 9:55 AM, ville syrjala
>
>
> ---------- Forwarded message ----------
> From: ** <ville.syrjala@linux.intel.com
> <mailto:ville.syrjala@linux.intel.com>>
> Date: Mon, Feb 24, 2014 at 8:32 PM
> Subject: [Intel-gfx] [PATCH 2/2] drm/i915: Drop the forcewake count
> inc/dec around register read on VLV
> To: intel-gfx@lists.freedesktop.org <mailto:intel-gfx@lists.freedesktop.org>
>
>
> From: Ville Syrjälä <ville.syrjala@linux.intel.com
> <mailto:ville.syrjala@linux.intel.com>>
>
> VLV is the only platform where we increment/decrement the forcewake
> count around register access. Drop the inc/dec on VLV to make the
> forcewake code a bit more unified.
>
> The inc/dec are not necessary since we hold the uncore lock around
> the whole operation.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com
> <mailto:ville.syrjala@linux.intel.com>>
> ---
>   drivers/gpu/drm/i915/intel_uncore.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c
> b/drivers/gpu/drm/i915/intel_uncore.c
> index 09fa555..dacb751 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -502,22 +502,22 @@ gen6_read##x(struct drm_i915_private *dev_priv,
> off_t reg, bool trace) { \
>   static u##x \
>   vlv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
>          unsigned fwengine = 0; \
> -       unsigned *fwcount; \
> +       unsigned fwcount; \
>          REG_READ_HEADER(x); \
>          if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) {   \
>                  fwengine = FORCEWAKE_RENDER;            \
> -               fwcount = &dev_priv->uncore.fw_rendercount;    \
> +               fwcount = dev_priv->uncore.fw_rendercount;    \
>          }                                               \
>          else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) {       \
>                  fwengine = FORCEWAKE_MEDIA;             \
> -               fwcount = &dev_priv->uncore.fw_mediacount;     \
> +               fwcount = dev_priv->uncore.fw_mediacount;     \
>          }  \
>          if (fwengine != 0) {            \
> -               if ((*fwcount)++ == 0) \
> +               if (fwcount == 0) \
>                          (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
>
> fwengine); \
>                  val = __raw_i915_read##x(dev_priv, reg); \
> -               if (--(*fwcount) == 0) \
> +               if (fwcount == 0) \
>                          (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
>                                                          fwengine); \
>          } else { \
> --
> 1.8.3.2
>
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>
Reviewed-by: Deepak S <deepak.s@intel.com>