Attachment 35459 Details for Bug 26864 – Add one function to check whether the audio is supported in HDMI sink

[patch] Add one function to check whether the audio is supported in HDMI sink

0001-drm-i915-Add-one-function-to-check-whether-Audio-is.patch (text/plain), 2.14 KB, created by ykzhao on 2010-05-06 08:34:51 UTC

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Creator: ykzhao

Created: 2010-05-06 08:34:51 UTC

Size: 2.14 KB

patch

obsolete

>From 5edcc0842ae58ba4e460efefabe074bf3e78c4a1 Mon Sep 17 00:00:00 2001
>From: Zhao Yakui <yakui.zhao@intel.com>
>Date: Thu, 6 May 2010 23:28:34 +0800
>Subject: [PATCH] drm/i915: check whether Audio is supported on HDMI sink
>
>Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
>---
> drivers/gpu/drm/drm_edid.c |   32 ++++++++++++++++++++++++++++++++
> include/drm/drm_crtc.h     |    1 +
> 2 files changed, 33 insertions(+), 0 deletions(-)
>
>diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>index bfd0e4a..607061e 100644
>--- a/drivers/gpu/drm/drm_edid.c
>+++ b/drivers/gpu/drm/drm_edid.c
>@@ -1322,6 +1322,38 @@ end:
> }
> EXPORT_SYMBOL(drm_detect_hdmi_monitor);
> 
>+bool drm_audio_is_supported(struct edid *edid)
>+{
>+#define HDMI_BASIC_AUDIO (1<<6)
>+	char *edid_ext = NULL;
>+	int i, hdmi_id, edid_ext_num;
>+	bool audio_is_supported = false;
>+
>+	if (!drm_detect_hdmi_monitor(edid))
>+		goto end;
>+
>+	/* Chose real EDID extension number */
>+	edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?
>+		       MAX_EDID_EXT_NUM : edid->extensions;
>+
>+	/* Find CEA extension */
>+	for (i = 0; i < edid_ext_num; i++) {
>+		edid_ext = (char *)edid + EDID_LENGTH * (i + 1);
>+		/* This block is CEA extension */
>+		if (edid_ext[0] == 0x02)
>+			break;
>+	}
>+
>+	if (i == edid_ext_num)
>+		goto end;
>+
>+	if (edid_ext[3] & HDMI_BASIC_AUDIO)
>+		audio_is_supported = true;
>+
>+end:
>+	return audio_is_supported;
>+}
>+EXPORT_SYMBOL(drm_audio_is_supported);
> /**
>  * drm_add_edid_modes - add modes from EDID data, if available
>  * @connector: connector we're probing
>diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
>index fdf43ab..0e3face 100644
>--- a/include/drm/drm_crtc.h
>+++ b/include/drm/drm_crtc.h
>@@ -791,6 +791,7 @@ extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
> extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
> 				    void *data, struct drm_file *file_priv);
> extern bool drm_detect_hdmi_monitor(struct edid *edid);
>+extern bool drm_audio_is_supported(struct edid *edid);
> extern int drm_mode_page_flip_ioctl(struct drm_device *dev,
> 				    void *data, struct drm_file *file_priv);
> extern struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
>-- 
>1.5.4.5
>

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