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drm/i915: Fix Limited Range Color Handling 

Some panels support limited range output (16-235) compared
to full range RGB values (0-255). Also userspace can control
the RGB range using "Broadcast RGB" property. Currently the
code to handle full range to limited range is broken. This
patch fixes the same by properly scaling down all the full
range co-efficients with limited range scaling factor.

v2: Fixed Ville's review comments.

v3: Changed input to const and used correct data types as
    suggested by Ville

v4: Fixed some missing data type corrections.

Signed-off-by: Johnson Lin <johnson.lin@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1517327489-26128-1-git-send-email-uma.shankar@intel.com
This commit is contained in:
Johnson Lin 2018-01-30 21:21:29 +05:30 committed by Ville Syrjälä
parent 4552f50a43
commit db9c06dfff
1 changed files with 14 additions and 15 deletions
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27
drivers/gpu/drm/i915/intel_color.c
View File

@ -84,26 +84,25 @@ static bool crtc_state_is_legacy_gamma(struct drm_crtc_state *state)
/*
* When using limited range, multiply the matrix given by userspace by
* the matrix that we would use for the limited range. We do the
* multiplication in U2.30 format.
* the matrix that we would use for the limited range.
*/
static void ctm_mult_by_limited(uint64_t *result, int64_t *input)
static void ctm_mult_by_limited(u64 *result, const u64 *input)
{
int i;
for (i = 0; i < 9; i++)
result[i] = 0;
for (i = 0; i < 3; i++) {
int64_t user_coeff = input[i * 3 + i];
uint64_t limited_coeff = CTM_COEFF_LIMITED_RANGE >> 2;
uint64_t abs_coeff = clamp_val(CTM_COEFF_ABS(user_coeff),
0,
for (i = 0; i < 9; i++) {
u64 user_coeff = input[i];
u32 limited_coeff = CTM_COEFF_LIMITED_RANGE;
u32 abs_coeff = clamp_val(CTM_COEFF_ABS(user_coeff), 0,
CTM_COEFF_4_0 - 1) >> 2;
result[i * 3 + i] = (limited_coeff * abs_coeff) >> 27;
if (CTM_COEFF_NEGATIVE(user_coeff))
result[i * 3 + i] |= CTM_COEFF_SIGN;
/*
* By scaling every co-efficient with limited range (16-235)
* vs full range (0-255) the final o/p will be scaled down to
* fit in the limited range supported by the panel.
*/
result[i] = mul_u32_u32(limited_coeff, abs_coeff) >> 30;
result[i] |= user_coeff & CTM_COEFF_SIGN;
}
}