[PATCH 1/4][SRU][Jammy] drm/i915/xelpd: Enable Pipe color support for D13 platform

[AceLan Kao]

From: Uma Shankar <uma.shankar at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1967274

Enable pipe color support for Display 13 platforms. Currently
limit to just 10bit gamma and later extend it for logarithmic
gamma, once the new UAPI is agreed by community and implemented
by a userspace consumer.

v2: Updated dev_priv to i915 (Ville)

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211207071135.3660332-2-uma.shankar@intel.com
(cherry picked from commit e83c18cffaedb1cd5da935b06d49308f92ea50cb)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index afcb4bf3826c..88f17960f700 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1572,6 +1572,8 @@ static int glk_color_check(struct intel_crtc_state *crtc_state)
 
 static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
 {
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 	u32 gamma_mode = 0;
 
 	if (crtc_state->hw.degamma_lut)
@@ -1584,6 +1586,13 @@ static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
 	if (!crtc_state->hw.gamma_lut ||
 	    crtc_state_is_legacy_gamma(crtc_state))
 		gamma_mode |= GAMMA_MODE_MODE_8BIT;
+	/*
+	 * Enable 10bit gamma for D13
+	 * ToDo: Extend to Logarithmic Gamma once the new UAPI
+	 * is acccepted and implemented by a userspace consumer
+	 */
+	else if (DISPLAY_VER(i915) >= 13)
+		gamma_mode |= GAMMA_MODE_MODE_10BIT;
 	else
 		gamma_mode |= GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED;
 
-- 
2.25.1