Commit 17815f62 authored by Uma Shankar's avatar Uma Shankar
Browse files

drm/i915/xelpd: Enable Pipe Degamma 



Enable Pipe Degamma for XE_LPD. Extend the legacy implementation
to incorparate the extended lut size for XE_LPD.

v2: Added a helper for degamma lut size (Ville)

Signed-off-by: default avatarUma Shankar <uma.shankar@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207071135.3660332-3-uma.shankar@intel.com
parent e83c18cf

drivers/gpu/drm/i915/display/intel_color.c

+11 −3
Original line number Diff line number Diff line
@@ -808,6 +808,14 @@ static void bdw_load_luts(const struct intel_crtc_state *crtc_state) 
	}

}



static int glk_degamma_lut_size(struct drm_i915_private *i915)

{

	if (DISPLAY_VER(i915) >= 13)

		return 131;

	else

		return 35;

}



static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)

{

	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -827,8 +835,8 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state) 


	for (i = 0; i < lut_size; i++) {

		/*

		 * First 33 entries represent range from 0 to 1.0

		 * 34th and 35th entry will represent extended range

		 * First lut_size entries represent range from 0 to 1.0

		 * 3 additional lut entries will represent extended range

		 * inputs 3.0 and 7.0 respectively, currently clamped

		 * at 1.0. Since the precision is 16bit, the user

		 * value can be directly filled to register.
@@ -844,7 +852,7 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state) 
	}



	/* Clamp values > 1.0. */

	while (i++ < 35)

	while (i++ < glk_degamma_lut_size(dev_priv))

		intel_de_write_fw(dev_priv, PRE_CSC_GAMC_DATA(pipe), 1 << 16);



	intel_de_write_fw(dev_priv, PRE_CSC_GAMC_INDEX(pipe), 0);