>-----Original Message-----
>From: Alexandru-Cosmin Gheorghe [mailto:Alexandru-
>cosmin.gheor...@arm.com]
>Sent: Tuesday, August 21, 2018 3:00 PM
>To: Shankar, Uma <uma.shan...@intel.com>
>Cc: intel-gfx@lists.freedesktop.org; dri-de...@lists.freedesktop.org;
>dcasta...@chromium.org; emil.l.veli...@gmail.com; seanp...@chromium.org;
>Syrjala, Ville <ville.syrj...@intel.com>; Lankhorst, Maarten
><maarten.lankho...@intel.com>; n...@arm.com
>Subject: Re: [RFC v4 1/8] drm: Add Enhanced Gamma LUT precision structure
>
>Hi Uma,
>
>On Fri, Aug 17, 2018 at 07:48:44PM +0530, Uma Shankar wrote:
>> Existing LUT precision structure is having only 16 bit precision. This
>> is not enough for upcoming enhanced hardwares and advance usecases
>> like HDR processing. Hence added a new structure with 32 bit precision
>> values. Also added the code, for extracting the same from values
>> passed from userspace.
>>
>> v4: Rebase
>>
>> Signed-off-by: Uma Shankar <uma.shan...@intel.com>
>> ---
>> drivers/gpu/drm/drm_plane.c | 19 +++++++++++++++++++
>> include/uapi/drm/drm_mode.h | 15 +++++++++++++++
>> 2 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
>> index 6153cbd..cd71fd0 100644
>> --- a/drivers/gpu/drm/drm_plane.c
>> +++ b/drivers/gpu/drm/drm_plane.c
>> @@ -430,6 +430,25 @@ void drm_plane_force_disable(struct drm_plane
>> *plane) } EXPORT_SYMBOL(drm_plane_force_disable);
>>
>> +/*
>> + * Added to accommodate enhanced LUT precision.
>> + * Max LUT precision is 32 bits.
>> + */
>> +uint32_t drm_color_lut_extract_ext(uint32_t user_input, uint32_t
>> +bit_precision)
>
>You should declare this function in a header file as well.
Thanks Alexandru for the review. Sure, will fix that and resend.
>With that fixed
>Reviewed-by: Alexandru Gheorghe <alexandru-cosmin.gheor...@arm.com>
>
>
>> +{
>> + uint32_t val = user_input;
>> + uint32_t max = 0xffffffff >> (32 - bit_precision);
>> +
>> + /* Round only if we're not using full precision. */
>> + if (bit_precision < 32) {
>> + val += 1UL << (32 - bit_precision - 1);
>> + val >>= 32 - bit_precision;
>> + }
>> +
>> + return clamp_val(val, 0, max);
>> +}
>> +EXPORT_SYMBOL(drm_color_lut_extract_ext);
>> +
>> /**
>> * drm_mode_plane_set_obj_prop - set the value of a property
>> * @plane: drm plane object to set property value for diff --git
>> a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index
>> 8d67243..874407b 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -629,6 +629,21 @@ struct drm_color_lut {
>> __u16 reserved;
>> };
>>
>> +/*
>> + * Creating 32 bit palette entries for better data
>> + * precision. This will be required for HDR and
>> + * similar color processing usecases.
>> + */
>> +struct drm_color_lut_ext {
>> + /*
>> + * Data is U0.32 fixed point format.
>> + */
>> + __u32 red;
>> + __u32 green;
>> + __u32 blue;
>> + __u32 reserved;
>> +};
>> +
>> #define DRM_MODE_PAGE_FLIP_EVENT 0x01 #define
>> DRM_MODE_PAGE_FLIP_ASYNC 0x02 #define
>> DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
>> --
>> 1.9.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-de...@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
>--
>Cheers,
>Alex G
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
