From: Russell King <rmk+kernel@arm.linux.org.uk>
To: alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org,
linux-arm-kernel@lists.infradead.org
Cc: Fabio Estevam <fabio.estevam@freescale.com>,
David Airlie <airlied@linux.ie>, Mark Brown <broonie@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Yakir Yang <ykk@rock-chips.com>
Subject: [PATCH RFC 07/11] drm/edid: add function to help find SADs
Date: Mon, 30 Mar 2015 20:40:32 +0100 [thread overview]
Message-ID: <E1YcfY0-0002vI-0F@rmk-PC.arm.linux.org.uk> (raw)
In-Reply-To: <20150330193911.GM24899@n2100.arm.linux.org.uk>
Add a function to find the start of the SADs in the ELD. This
complements the helper to retrieve the SAD count.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
include/drm/drm_edid.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 87d85e81d3a7..c44ad513e0f7 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -346,6 +346,25 @@ static inline int drm_eld_mnl(const uint8_t *eld)
}
/**
+ * drm_eld_sad - Get ELD SAD structures.
+ * @eld: pointer to an eld memory structure with sad_count set
+ */
+static inline const uint8_t *drm_eld_sad(const uint8_t *eld)
+{
+ unsigned int ver, mnl;
+
+ ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
+ if (ver != 2 && ver != 31)
+ return NULL;
+
+ mnl = drm_eld_mnl(eld);
+ if (mnl > 16)
+ return NULL;
+
+ return eld + DRM_ELD_CEA_SAD(mnl, 0);
+}
+
+/**
* drm_eld_sad_count - Get ELD SAD count.
* @eld: pointer to an eld memory structure with sad_count set
*/
--
1.8.3.1
next prev parent reply other threads:[~2015-03-30 19:40 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-30 19:39 [RFC 0/11] dw_hdmi cleanups, audio preparation, helpers and ahb audio support Russell King - ARM Linux
2015-03-30 19:40 ` [PATCH RFC 01/11] drm: bridge/dw_hdmi: clean up hdmi_set_clk_regenerator() Russell King
2015-03-31 6:55 ` Yang Kuankuan
2015-03-31 10:35 ` Russell King - ARM Linux
2015-04-01 1:54 ` Yakir
2015-03-30 19:40 ` [PATCH RFC 02/11] drm: bridge/dw_hdmi: use drm_hdmi_avi_infoframe_from_display_mode() Russell King
2015-03-31 9:02 ` Yang Kuankuan
2015-03-31 11:57 ` Russell King - ARM Linux
2015-04-01 1:31 ` Yakir
2015-03-30 19:40 ` [PATCH RFC 03/11] drm: bridge/dw_hdmi: simplify hdmi_config_AVI() a little Russell King
2015-03-30 19:40 ` [PATCH RFC 04/11] drm: bridge/dw_hdmi: remove mhsyncpolarity/mvsyncpolarity/minterlaced Russell King
2015-03-30 19:40 ` [PATCH RFC 05/11] drm: bridge/dw_hdmi: introduce interface to setting sample rate Russell King
2015-03-30 19:40 ` [PATCH RFC 06/11] drm: bridge/dw_hdmi: introduce interfaces to enable and disable audio Russell King
2015-03-31 7:45 ` Yang Kuankuan
2015-03-31 9:15 ` Philipp Zabel
2015-03-30 19:40 ` Russell King [this message]
2015-04-01 11:47 ` [PATCH RFC 07/11] drm/edid: add function to help find SADs Jani Nikula
2015-04-01 11:56 ` Russell King - ARM Linux
2015-04-02 10:52 ` [PATCH] drm/edid: add #defines for ELD versions Jani Nikula
2015-03-30 19:40 ` [PATCH RFC 08/11] sound/core: add DRM ELD helper Russell King
2015-03-31 9:12 ` Philipp Zabel
2015-03-30 19:40 ` [PATCH RFC 09/11] sound/core: add IEC958 channel status helper Russell King
2015-03-31 8:30 ` Yang Kuankuan
2015-03-31 9:13 ` Russell King - ARM Linux
2015-04-01 2:04 ` Yakir
2015-04-01 7:58 ` Russell King - ARM Linux
2015-03-31 9:10 ` Philipp Zabel
2015-03-31 9:16 ` Russell King - ARM Linux
2015-03-30 19:40 ` [PATCH RFC 10/11] drm: bridge/dw_hdmi-ahb-audio: add audio driver Russell King
2015-03-30 19:40 ` [PATCH RFC 11/11] drm: bridge/dw_hdmi-ahb-audio: parse ELD from HDMI driver Russell King
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