[Intel-gfx] [PATCH] drm/i915: Set legacy properties when using legacy gamma set IOCTL.

[Lionel Landwerlin]

Hi Paul,

Unfortunate that we've been writing the same patch at the same time :(
I think this we've got pretty much the same fix, but it probably needs 
to be done at the DRM level, because this can impact other drivers too.

Cheers,

-
Lionel

On 08/04/16 17:26, Bob Paauwe wrote:
> The i915 driver is now using atomic properties and atomic commit
> to handle the legacy set gamma IOCTL. However, if the driver is
> configured without atomic (nuclear_pageflip = false), it won't
> update the legacy properties for degamma_lut, gamma_lut and ctm
> leaving them out of sync with the atomic version of the properties.
>
> Until the driver is full atomic, make sure we update the non-atomic
> version of the properties.
>
> igt-testcase: kms_pipe_color / legacy-gamma-reset-pipeX
> Signed-off-by: Bob Paauwe <bob.j.paauwe at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_display.c | 38 +++++++++++++++++++++++++++++++++++-
>   1 file changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5155efb6..ff09a18 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13885,8 +13885,44 @@ out:
>   
>   #undef for_each_intel_crtc_masked
>   
> +/*
> + * TODO: Remove this once we have full atomic implmented.
> + */
> +static void intel_atomic_legacy_gamma_set(struct drm_crtc *crtc,
> +					  u16 *red, u16 *green, u16 *blue,
> +					  uint32_t start, uint32_t size)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_mode_config *config = &dev->mode_config;
> +	struct drm_crtc_state *state;
> +
> +	drm_atomic_helper_legacy_gamma_set(crtc, red, green, blue, start, size);
> +
> +	/*
> +	 * Make sure we update the legacy properties so this works when
> +	 * atomic is not enabled.
> +	 */
> +
> +	state = crtc->state;
> +
> +	drm_object_property_set_value(&crtc->base,
> +				      config->degamma_lut_property,
> +				      (state->degamma_lut) ?
> +				      state->degamma_lut->base.id : 0);
> +
> +	drm_object_property_set_value(&crtc->base,
> +				      config->ctm_property,
> +				      (state->ctm) ?
> +				      state->ctm->base.id : 0);
> +
> +	drm_object_property_set_value(&crtc->base,
> +				      config->gamma_lut_property,
> +				      (state->gamma_lut) ?
> +				      state->gamma_lut->base.id : 0);
> +}
> +
>   static const struct drm_crtc_funcs intel_crtc_funcs = {
> -	.gamma_set = drm_atomic_helper_legacy_gamma_set,
> +	.gamma_set = intel_atomic_legacy_gamma_set,
>   	.set_config = drm_atomic_helper_set_config,
>   	.set_property = drm_atomic_helper_crtc_set_property,
>   	.destroy = intel_crtc_destroy,