[Intel-gfx] [PATCH] drm/i915: only apply GAMMA_MODE IPS WA on HSW

[Damien Lespiau]

On Wed, Jan 08, 2014 at 05:26:31PM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> The WA is mentioned in HSW's GAMMA_MODE register documentation, but
> not on on BDW's documentation, so let's assume it is not needed there.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

It looks that way indeed (not tested either).

Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>

-- 
Damien

> ---
>  drivers/gpu/drm/i915/intel_display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Not tested.
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index bf4c6b5..3d98bcd 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3496,7 +3496,7 @@ static void intel_crtc_load_lut(struct drm_crtc *crtc)
>  	/* Workaround : Do not read or write the pipe palette/gamma data while
>  	 * GAMMA_MODE is configured for split gamma and IPS_CTL has IPS enabled.
>  	 */
> -	if (intel_crtc->config.ips_enabled &&
> +	if (IS_HASWELL(dev) && intel_crtc->config.ips_enabled &&
>  	    ((I915_READ(GAMMA_MODE(pipe)) & GAMMA_MODE_MODE_MASK) ==
>  	     GAMMA_MODE_MODE_SPLIT)) {
>  		hsw_disable_ips(intel_crtc);
> -- 
> 1.8.4.2
> 
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