From: Pranay Samala <[email protected]> Implement plane post-CSC LUT support for SDR planes.
v2: - Restructure loop to match HDR function pattern Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Pranay Samala <[email protected]> Co-developed-by: Chaitanya Kumar Borah <[email protected]> Signed-off-by: Chaitanya Kumar Borah <[email protected]> --- drivers/gpu/drm/i915/display/intel_color.c | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c index 360046979556..be2e1d8ce0e6 100644 --- a/drivers/gpu/drm/i915/display/intel_color.c +++ b/drivers/gpu/drm/i915/display/intel_color.c @@ -4082,6 +4082,45 @@ xelpd_load_hdr_post_csc_lut(struct intel_display *display, intel_de_write_dsb(display, dsb, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0), 0); } +static void +xelpd_load_sdr_post_csc_lut(struct intel_display *display, + struct intel_dsb *dsb, + enum pipe pipe, + enum plane_id plane, + const struct drm_color_lut32 *post_csc_lut) +{ + int i, lut_size = 32; + u32 lut_val; + + /* + * First 3 planes are HDR, so reduce by 3 to get to the right + * SDR plane offset + */ + plane = plane - 3; + + intel_de_write_dsb(display, dsb, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0), + PLANE_PAL_PREC_AUTO_INCREMENT); + + for (i = 0; i < lut_size + 3; i++) { + if (post_csc_lut) { + if (i < lut_size) + lut_val = drm_color_lut32_extract(post_csc_lut[i].green, 16); + /* else duplicate last lut_val */ + } else { + if (i < lut_size) + lut_val = (i * ((1 << 16) - 1)) / (lut_size - 1); + else + lut_val = 1 << 16; + } + + intel_de_write_dsb(display, dsb, + PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0), + lut_val); + } + + intel_de_write_dsb(display, dsb, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0), 0); +} + static void xelpd_program_plane_post_csc_lut(struct intel_dsb *dsb, const struct intel_plane_state *plane_state) @@ -4095,6 +4134,8 @@ xelpd_program_plane_post_csc_lut(struct intel_dsb *dsb, if (icl_is_hdr_plane(display, plane)) xelpd_load_hdr_post_csc_lut(display, dsb, pipe, plane, post_csc_lut); + else + xelpd_load_sdr_post_csc_lut(display, dsb, pipe, plane, post_csc_lut); } static void -- 2.25.1
