[v7 6/9] drm/i915: Add HLG EOTF

[Uma Shankar]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

ADD HLG EOTF to the list of EOTF transfer functions supported.
Hybrid Log-Gamma (HLG) is a high dynamic range (HDR) standard.
HLG defines a nonlinear transfer function in which the lower
half of the signal values use a gamma curve and the upper half
of the signal values use a logarithmic curve.

v2: Rebase

v3: Fixed a warning message

v4: Addressed Shashank's review comments

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 3 ++-
 include/linux/hdmi.h       | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 51945f6..5e393fd 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3835,7 +3835,8 @@ static uint8_t eotf_supported(const u8 *edid_ext)
 	return edid_ext[2] &
 		(BIT(HDMI_EOTF_TRADITIONAL_GAMMA_SDR) |
 		 BIT(HDMI_EOTF_TRADITIONAL_GAMMA_HDR) |
-		 BIT(HDMI_EOTF_SMPTE_ST2084));
+		 BIT(HDMI_EOTF_SMPTE_ST2084) |
+		 BIT(HDMI_EOTF_BT_2100_HLG));
 }
 
 static uint8_t hdr_metadata_type(const u8 *edid_ext)
diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
index a23c5e7..bbf14b9 100644
--- a/include/linux/hdmi.h
+++ b/include/linux/hdmi.h
@@ -161,6 +161,7 @@ enum hdmi_eotf {
 	HDMI_EOTF_TRADITIONAL_GAMMA_SDR,
 	HDMI_EOTF_TRADITIONAL_GAMMA_HDR,
 	HDMI_EOTF_SMPTE_ST2084,
+	HDMI_EOTF_BT_2100_HLG,
 };
 
 struct hdmi_avi_infoframe {
-- 
1.9.1