Re: [PATCH] drm/i915: Fix FB WM for HSW

From: Paulo Zanoni <przanoni@gmail.com>
To: ville.syrjala@linux.intel.com
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915: Fix FB WM for HSW
Date: Fri, 9 Aug 2013 15:19:32 -0300	[thread overview]
Message-ID: <CA+gsUGTed8eGyhrGMDZpjuycQ63de5uq7V1SWVk2+KA+35+eNA@mail.gmail.com> (raw)
In-Reply-To: <1376060529-10141-1-git-send-email-ville.syrjala@linux.intel.com>

2013/8/9  <ville.syrjala@linux.intel.com>:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Due to a misplaced memset(), we never actually enabled the FBC WM on HSW.
> Move the memset() to happen a bit earlier, so that it won't clobber
> results->enable_fbc_wm.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Yay! Thanks!

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index b0e4a0b..862e350 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2429,6 +2429,8 @@ static void hsw_compute_wm_results(struct drm_device *dev,
>                         break;
>         max_level = level - 1;
>
> +       memset(results, 0, sizeof(*results));
> +
>         /* The spec says it is preferred to disable FBC WMs instead of disabling
>          * a WM level. */
>         results->enable_fbc_wm = true;
> @@ -2439,7 +2441,6 @@ static void hsw_compute_wm_results(struct drm_device *dev,
>                 }
>         }
>
> -       memset(results, 0, sizeof(*results));
>         for (wm_lp = 1; wm_lp <= 3; wm_lp++) {
>                 const struct hsw_lp_wm_result *r;
>
> --
> 1.8.1.5
>
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-- 
Paulo Zanoni