| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20200831195316.GC6112@intel.com>
Date: Mon, 31 Aug 2020 22:53:16 +0300
From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
To: crj <algea.cao@...k-chips.com>
Cc: mripard@...nel.org, tzimmermann@...e.de,
linux-kernel@...r.kernel.org, airlied@...ux.ie,
dri-devel@...ts.freedesktop.org, maarten.lankhorst@...ux.intel.com,
daniel@...ll.ch, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] drm: Parse Colorimetry data block from EDID
On Fri, Aug 28, 2020 at 09:07:13AM +0800, crj wrote:
> Hi Ville Syrjälä,
>
> 在 2020/8/27 18:57, Ville Syrjälä 写道:
> > On Wed, Aug 26, 2020 at 10:23:28PM +0800, Algea Cao wrote:
> >> CEA 861.3 spec adds colorimetry data block for HDMI.
> >> Parsing the block to get the colorimetry data from
> >> panel.
> > And what exactly do you want to do with that data?
>
>
> We can get colorimetry data block from edid then support
>
> HDMI colorimetry such as BT2020.
But what do you want to do with it? The patch does nothing
functional.
>
> >> Signed-off-by: Algea Cao <algea.cao@...k-chips.com>
> >> ---
> >>
> >> drivers/gpu/drm/drm_edid.c | 45 +++++++++++++++++++++++++++++++++++++
> >> include/drm/drm_connector.h | 3 +++
> >> include/drm/drm_edid.h | 14 ++++++++++++
> >> 3 files changed, 62 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >> index 31496b6cfc56..67e607c04492 100644
> >> --- a/drivers/gpu/drm/drm_edid.c
> >> +++ b/drivers/gpu/drm/drm_edid.c
> >> @@ -3223,6 +3223,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
> >> #define VIDEO_BLOCK 0x02
> >> #define VENDOR_BLOCK 0x03
> >> #define SPEAKER_BLOCK 0x04
> >> +#define COLORIMETRY_DATA_BLOCK 0x5
> >> #define HDR_STATIC_METADATA_BLOCK 0x6
> >> #define USE_EXTENDED_TAG 0x07
> >> #define EXT_VIDEO_CAPABILITY_BLOCK 0x00
> >> @@ -4309,6 +4310,48 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
> >> mode->clock = clock;
> >> }
> >>
> >> +static bool cea_db_is_hdmi_colorimetry_data_block(const u8 *db)
> >> +{
> >> + if (cea_db_tag(db) != USE_EXTENDED_TAG)
> >> + return false;
> >> +
> >> + if (db[1] != COLORIMETRY_DATA_BLOCK)
> >> + return false;
> >> +
> >> + if (cea_db_payload_len(db) < 2)
> >> + return false;
> >> +
> >> + return true;
> >> +}
> >> +
> >> +static void
> >> +drm_parse_colorimetry_data_block(struct drm_connector *connector, const u8 *db)
> >> +{
> >> + struct drm_hdmi_info *info = &connector->display_info.hdmi;
> >> +
> >> + if (db[2] & DRM_EDID_CLRMETRY_xvYCC_601)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_xvYCC_601;
> >> + if (db[2] & DRM_EDID_CLRMETRY_xvYCC_709)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_xvYCC_709;
> >> + if (db[2] & DRM_EDID_CLRMETRY_sYCC_601)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_sYCC_601;
> >> + if (db[2] & DRM_EDID_CLRMETRY_ADBYCC_601)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_ADBYCC_601;
> >> + if (db[2] & DRM_EDID_CLRMETRY_ADB_RGB)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_ADB_RGB;
> >> + if (db[2] & DRM_EDID_CLRMETRY_BT2020_CYCC)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_CYCC;
> >> + if (db[2] & DRM_EDID_CLRMETRY_BT2020_YCC)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_YCC;
> >> + if (db[2] & DRM_EDID_CLRMETRY_BT2020_RGB)
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_RGB;
> >> + /* Byte 4 Bit 7: DCI-P3 */
> >> + if (db[3] & BIT(7))
> >> + info->colorimetry |= DRM_EDID_CLRMETRY_DCI_P3;
> >> +
> >> + DRM_DEBUG_KMS("Supported Colorimetry 0x%x\n", info->colorimetry);
> >> +}
> >> +
> >> static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
> >> {
> >> if (cea_db_tag(db) != USE_EXTENDED_TAG)
> >> @@ -4994,6 +5037,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> >> drm_parse_vcdb(connector, db);
> >> if (cea_db_is_hdmi_hdr_metadata_block(db))
> >> drm_parse_hdr_metadata_block(connector, db);
> >> + if (cea_db_is_hdmi_colorimetry_data_block(db))
> >> + drm_parse_colorimetry_data_block(connector, db);
> >> }
> >> }
> >>
> >> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> >> index af145608b5ed..d599c3b9e881 100644
> >> --- a/include/drm/drm_connector.h
> >> +++ b/include/drm/drm_connector.h
> >> @@ -207,6 +207,9 @@ struct drm_hdmi_info {
> >>
> >> /** @y420_dc_modes: bitmap of deep color support index */
> >> u8 y420_dc_modes;
> >> +
> >> + /* @colorimetry: bitmap of supported colorimetry modes */
> >> + u16 colorimetry;
> >> };
> >>
> >> /**
> >> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> >> index cfa4f5af49af..98fa78c2f82d 100644
> >> --- a/include/drm/drm_edid.h
> >> +++ b/include/drm/drm_edid.h
> >> @@ -229,6 +229,20 @@ struct detailed_timing {
> >> DRM_EDID_YCBCR420_DC_36 | \
> >> DRM_EDID_YCBCR420_DC_30)
> >>
> >> +/*
> >> + * Supported Colorimetry from colorimetry data block
> >> + * as per CEA 861-G spec
> >> + */
> >> +#define DRM_EDID_CLRMETRY_xvYCC_601 (1 << 0)
> >> +#define DRM_EDID_CLRMETRY_xvYCC_709 (1 << 1)
> >> +#define DRM_EDID_CLRMETRY_sYCC_601 (1 << 2)
> >> +#define DRM_EDID_CLRMETRY_ADBYCC_601 (1 << 3)
> >> +#define DRM_EDID_CLRMETRY_ADB_RGB (1 << 4)
> >> +#define DRM_EDID_CLRMETRY_BT2020_CYCC (1 << 5)
> >> +#define DRM_EDID_CLRMETRY_BT2020_YCC (1 << 6)
> >> +#define DRM_EDID_CLRMETRY_BT2020_RGB (1 << 7)
> >> +#define DRM_EDID_CLRMETRY_DCI_P3 (1 << 15)
> >> +
> >> /* ELD Header Block */
> >> #define DRM_ELD_HEADER_BLOCK_SIZE 4
> >>
> >> --
> >> 2.25.1
> >>
> >>
> >>
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@...ts.freedesktop.org
> >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
--
Ville Syrjälä
Intel
Powered by blists - more mailing lists