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authorWu Fengguang <fengguang.wu@intel.com>2011-09-05 10:25:34 +0400
committerKeith Packard <keithp@keithp.com>2011-09-22 01:52:41 +0400
commite0dac65ed45e72fe34cc7ccc76de0ba220bd38bb (patch)
treef6f1628bb63a9db0b77318e0486e91d26c918ae0 /drivers/gpu/drm/i915/intel_modes.c
parent76adaa34db407f174dd06370cb60f6029c33b465 (diff)
downloadlinux-e0dac65ed45e72fe34cc7ccc76de0ba220bd38bb.tar.xz
drm/i915: pass ELD to HDMI/DP audio driver
Add ELD support for Intel Eaglelake, IbexPeak/Ironlake, SandyBridge/CougarPoint and IvyBridge/PantherPoint chips. ELD (EDID-Like Data) describes to the HDMI/DP audio driver the audio capabilities of the plugged monitor. It's built and passed to audio driver in 2 steps: (1) at get_modes time, parse EDID and save ELD to drm_connector.eld[] (2) at mode_set time, write drm_connector.eld[] to the Transcoder's hw ELD buffer and set the ELD_valid bit to inform HDMI/DP audio driver This patch is tested OK on G45/HDMI, IbexPeak/HDMI and IvyBridge/HDMI+DP. Test scheme: plug in the HDMI/DP monitor, and run cat /proc/asound/card0/eld* to check if the monitor name, HDMI/DP type, etc. show up correctly. Minor imperfection: the GEN5_AUD_CNTL_ST/DIP_Port_Select field always reads 0 (reserved). Without knowing the port number, I worked it around by setting the ELD_valid bit for ALL the three ports. It's tested to not be a problem, because the audio driver will find invalid ELD data and hence rightfully abort, even when it sees the ELD_valid indicator. Thanks to Zhenyu and Pierre-Louis for a lot of valuable help and testing. CC: Zhao Yakui <yakui.zhao@intel.com> CC: Wang Zhenyu <zhenyu.z.wang@intel.com> CC: Jeremy Bush <contractfrombelow@gmail.com> CC: Christopher White <c.white@pulseforce.com> CC: Pierre-Louis Bossart <pierre-louis.bossart@intel.com> CC: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_modes.c')
-rw-r--r--drivers/gpu/drm/i915/intel_modes.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index 3b26a3ba02dd..be2c6fe07d12 100644
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/fb.h>
+#include <drm/drm_edid.h>
#include "drmP.h"
#include "intel_drv.h"
#include "i915_drv.h"
@@ -74,6 +75,7 @@ int intel_ddc_get_modes(struct drm_connector *connector,
if (edid) {
drm_mode_connector_update_edid_property(connector, edid);
ret = drm_add_edid_modes(connector, edid);
+ drm_edid_to_eld(connector, edid);
connector->display_info.raw_edid = NULL;
kfree(edid);
}