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>

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 81b842270db9efa93b4e638c443e8bba41e1b6c4..7480f072c37531995741c0c0ef0f6c53b2eaf723 100644 (file)
--- 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;