[v10 07/12] drm: Add HLG EOTF

Uma Shankar
2019-05-14T17:36:29Z

From: Ville Syrjälä <ville.syrjala@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

v5: Addressed Jonas Karlman's review comment and dropped the i915
tag from header.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@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 73b7905..bc46041 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3851,7 +3851,8 @@ 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 7edafcf..3d7f10f 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