From b76dfbef061acc29b74cc61e9fbbb60537edcc55 Mon Sep 17 00:00:00 2001 From: SivapiriyanKumarasamy Date: Tue, 9 Oct 2018 12:59:46 -0400 Subject: 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 Reviewed-by: Krunoslav Kovac Acked-by: Leo Li Signed-off-by: Alex Deucher --- .../drm/amd/display/modules/color/color_gamma.c | 44 +++++++++++++--------- 1 file changed, 26 insertions(+), 18 deletions(-) (limited to 'drivers/gpu/drm/amd/display/modules') 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; -- cgit v1.2.3