Re: [PATCH v3 3/3] drm/omapdrm: Implement gamma_lut atomic crtc property

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

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On 24/05/16 12:16, Jyri Sarha wrote:
> Implement gamma_lut atomic crtc property, set crtc gamma size to 256
> for all crtcs and use drm_atomic_helper_legacy_gamma_set() as
> gamma_set func. The tv-out crtc has 1024 element gamma table (with
> 10bit precision) in HW, but current Xorg server does not accept
> anything else but 256 elements so that is used for all CRTCs. The dss
> dispc API converts table of any length for HW and uses linear
> interpolation in the process.
> 
> Signed-off-by: Jyri Sarha <jsarha@ti.com>
> ---
>  drivers/gpu/drm/omapdrm/omap_crtc.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
> index 075f2bb..d5210fe 100644
> --- a/drivers/gpu/drm/omapdrm/omap_crtc.c
> +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
> @@ -384,6 +384,15 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc,
>  
>  	WARN_ON(omap_crtc->vblank_irq.registered);
>  
> +	if (crtc->state->color_mgmt_changed) {
> +		struct drm_color_lut *lut = (struct drm_color_lut *)
> +			crtc->state->gamma_lut->data;

'gamma_lut' here is NULL when removing gamma table, which crashes the
driver at the moment

 Tomi


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