diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.19.8/0721-drm-amd-display-Clip-all-remaining-regamma-points-af.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.19.8/0721-drm-amd-display-Clip-all-remaining-regamma-points-af.patch | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0721-drm-amd-display-Clip-all-remaining-regamma-points-af.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0721-drm-amd-display-Clip-all-remaining-regamma-points-af.patch new file mode 100644 index 00000000..1ce63278 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0721-drm-amd-display-Clip-all-remaining-regamma-points-af.patch @@ -0,0 +1,91 @@ +From 87e43eda8a0e9ddb9909d80523ae201f8a359e6f Mon Sep 17 00:00:00 2001 +From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> +Date: Tue, 9 Oct 2018 12:59:46 -0400 +Subject: [PATCH 0721/2940] drm/amd/display: Clip all remaining regamma points + after first clipped point + +[Why] +All values computed in the gamma curve after the first upperbound +clipped point will need to be clipped anyways. We can avoid +unnecessary computations and potential fixed point +overflow by instead clipping these values to 1 automatically. + +[How] +Track if upper-bound clipping has been done, and clip all values after +this threshold is reached without computing the output gamma +point. + +Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> +Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com> +Acked-by: Leo Li <sunpeng.li@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + .../amd/display/modules/color/color_gamma.c | 44 +++++++++++-------- + 1 file changed, 26 insertions(+), 18 deletions(-) + +diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +index 81b842270db9..7480f072c375 100644 +--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c ++++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +@@ -820,6 +820,7 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma, + struct fixed31_32 clip = dc_fixpt_one; + struct fixed31_32 output; + bool use_eetf = false; ++ bool is_clipped = false; + struct fixed31_32 sdr_white_level = dc_fixpt_from_int(fs_params->sdr_white_level); + + if (fs_params == NULL || fs_params->max_content == 0 || +@@ -844,25 +845,32 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma, + rgb += 32; // first 32 points have problems with fixed point, too small + coord_x += 32; + for (i = 32; i <= hw_points_num; i++) { +- if (use_eetf) { +- /*max content is equal 1 */ +- scaledX1 = dc_fixpt_div(coord_x->x, +- dc_fixpt_div(max_content, sdr_white_level)); +- hermite_spline_eetf(scaledX1, max_display, min_display, +- max_content, &scaledX); +- } else +- scaledX = dc_fixpt_div(coord_x->x, +- dc_fixpt_div(max_display, sdr_white_level)); +- +- if (dc_fixpt_lt(scaledX, clip)) { +- if (dc_fixpt_lt(scaledX, dc_fixpt_zero)) +- output = dc_fixpt_zero; +- else +- output = calculate_gamma22(scaledX); ++ if (!is_clipped) { ++ if (use_eetf) { ++ /*max content is equal 1 */ ++ scaledX1 = dc_fixpt_div(coord_x->x, ++ dc_fixpt_div(max_content, sdr_white_level)); ++ hermite_spline_eetf(scaledX1, max_display, min_display, ++ max_content, &scaledX); ++ } else ++ scaledX = dc_fixpt_div(coord_x->x, ++ dc_fixpt_div(max_display, sdr_white_level)); ++ ++ if (dc_fixpt_lt(scaledX, clip)) { ++ if (dc_fixpt_lt(scaledX, dc_fixpt_zero)) ++ output = dc_fixpt_zero; ++ else ++ output = calculate_gamma22(scaledX); + +- rgb->r = output; +- rgb->g = output; +- rgb->b = output; ++ rgb->r = output; ++ rgb->g = output; ++ rgb->b = output; ++ } else { ++ is_clipped = true; ++ rgb->r = clip; ++ rgb->g = clip; ++ rgb->b = clip; ++ } + } else { + rgb->r = clip; + rgb->g = clip; +-- +2.17.1 + |