On 05/26/16 12:05, Tomi Valkeinen wrote:
> Hi Jyri, Daniel,
>
> On 26/05/16 11:35, Jyri Sarha wrote:
>> Add drm_crtc_enable_color_mgmt(), remove drm_helper_crtc_enable_color_mgmt()
>> and update drm/i915-driver (the only user of the old function).
>>
>> The new function is more flexible. It allows driver to enable only the
>> features it has without forcing to enable all three color management
>> properties: degamma lut, csc matrix (ctm), and gamma lut.
>>
>> Suggested-by: Daniel Vetter <daniel@xxxxxxxx>
>> Signed-off-by: Jyri Sarha <jsarha@xxxxxx>
>
>> +void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
>> + uint degamma_lut_size,
>> + bool has_ctm,
>> + uint gamma_lut_size)
>> +{
>> + struct drm_device *dev = crtc->dev;
>> + struct drm_mode_config *config = &dev->mode_config;
>> +
>> + if (degamma_lut_size) {
>> + drm_object_attach_property(&crtc->base,
>> + config->degamma_lut_property, 0);
>> + drm_object_attach_property(&crtc->base,
>> + config->degamma_lut_size_property,
>> + degamma_lut_size);
>> + }
>> +
>> + if (has_ctm)
>> + drm_object_attach_property(&crtc->base,
>> + config->ctm_property, 0);
>> +
>> + if (gamma_lut_size) {
>> + drm_object_attach_property(&crtc->base,
>> + config->gamma_lut_property, 0);
>> + drm_object_attach_property(&crtc->base,
>> + config->gamma_lut_size_property,
>> + gamma_lut_size);
>> + }
>> +}
>
> As I mentioned, I think it would make sense to call
> drm_mode_crtc_set_gamma_size() here. At least from omapdrm perspective.
>
> I had a look at i915, and that one looks a bit odd. It always sets
> drm_mode_crtc_set_gamma_size(256), but then only calls
> drm_helper_crtc_enable_color_mgmt() if
> INTEL_INFO(dev)->color.gamma_lut_size > 0, and gives gamma_lut_size as
> the size.
>
> Is there some legacy stuff at play here? drm_mode_crtc_set_gamma_size()
> should always be 256 (as X expects that), but the GAMMA_LUT property can
> give the real gamma lut size?
>
This indeed seems to be the case. If call drm_mode_crtc_set_gamma_size,
with 256, but set the gamma_lut_size_property to 1024, the X still works
but trough atomic API I can use the full length gamma table.
I wonder if should do yet one more patch-round?
BR,
Jyri
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