[PATCH] drm/radeon: add HDMI/DP sink description to ELD like data

[Stefan Bruens]

Provide monitor name and product/manufacturer id to alsa hda driver. The output
matches the fglrx settings, short of the port_id. As the latter is not standardized,
leave it out for now.

Corresponding alsa code is already in place.

Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
---
The fglrx register settings where retrieved using Rafal Mileckis gdb script.
After applying the patch fglrx and radeon register settings for sink info match,
short of the port_id.

Regarding port id, see comment by Takashi Iwai, 14 Nov 2013:
http://www.spinics.net/linux/fedora/alsa-user/msg12453.html
and RFC by Stephen Warren (NVidia), 25 May 2011:
http://lists.freedesktop.org/pipermail/xorg/2011-May/052893.html

 drivers/gpu/drm/radeon/dce6_afmt.c      | 67 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/radeon/evergreen_hdmi.c |  2 +
 2 files changed, 69 insertions(+)

diff --git a/drivers/gpu/drm/radeon/dce6_afmt.c b/drivers/gpu/drm/radeon/dce6_afmt.c
index 0a65dc7..1adf95a 100644
--- a/drivers/gpu/drm/radeon/dce6_afmt.c
+++ b/drivers/gpu/drm/radeon/dce6_afmt.c
@@ -273,6 +273,73 @@ void dce6_afmt_write_sad_regs(struct drm_encoder *encoder)
 	kfree(sads);
 }
 
+void dce6_afmt_write_sinkinfo(struct drm_encoder *encoder)
+{
+	struct radeon_device *rdev = encoder->dev->dev_private;
+	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+	struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+	struct drm_connector *connector;
+	u32 tmp = 0, offset;
+	char description[18];
+	uint8_t *eld;
+
+	if (!dig || !dig->afmt || !dig->afmt->pin)
+		return;
+
+	offset = dig->afmt->pin->offset;
+
+	list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) {
+		if (connector->encoder == encoder)
+			break;
+	}
+
+	if (!connector) {
+		DRM_ERROR("Couldn't find encoder's connector\n");
+		return;
+	}
+
+	if (!connector->eld[0]) {
+		DRM_ERROR("Connector has no ELD\n");
+		return;
+	}
+
+	eld = connector->eld;
+
+	tmp = MANUFACTURER_ID(eld[16]<<8 | eld[17]) | PRODUCT_ID(eld[18]<<8 | eld[19]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO0, tmp);
+
+	tmp = SINK_DESCRIPTION_LEN(strlen(&eld[20])) + 1;
+	tmp = (tmp > 19) ? 19 : tmp;
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO1, tmp);
+
+	strncpy(description, &eld[20], 18);
+
+	tmp = PORT_ID0(0x1);
+	//WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO2, tmp);
+
+	tmp = PORT_ID1(0x100);
+	//WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO3, tmp);
+
+	tmp = DESCRIPTION0(description[0]) | DESCRIPTION1(description[1]) |
+	      DESCRIPTION2(description[2]) | DESCRIPTION3(description[3]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO4, tmp);
+
+	tmp = DESCRIPTION4(description[4]) | DESCRIPTION5(description[5]) |
+	      DESCRIPTION6(description[6]) | DESCRIPTION7(description[7]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO5, tmp);
+
+	tmp = DESCRIPTION8(description[8]) | DESCRIPTION9(description[9]) |
+	      DESCRIPTION10(description[10]) | DESCRIPTION11(description[11]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO6, tmp);
+
+	tmp = DESCRIPTION12(description[12]) | DESCRIPTION13(description[13]) |
+	      DESCRIPTION14(description[14]) | DESCRIPTION15(description[15]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO7, tmp);
+
+	tmp = DESCRIPTION16(description[16]) | DESCRIPTION17(description[17]);
+	WREG32_ENDPOINT(offset, AZ_F0_CODEC_PIN_CONTROL_SINK_INFO8, tmp);
+}
+
 static int dce6_audio_chipset_supported(struct radeon_device *rdev)
 {
 	return !ASIC_IS_NODCE(rdev);
diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index 1ec0e6e..b04ec3b 100644
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -37,6 +37,7 @@ extern void dce6_afmt_write_sad_regs(struct drm_encoder *encoder);
 extern void dce6_afmt_select_pin(struct drm_encoder *encoder);
 extern void dce6_afmt_write_latency_fields(struct drm_encoder *encoder,
 					   struct drm_display_mode *mode);
+extern void dce6_afmt_write_sinkinfo(struct drm_encoder *encoder);
 
 /*
  * update the N and CTS parameters for a given pixel clock rate
@@ -425,6 +426,7 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
 		dce6_afmt_select_pin(encoder);
 		dce6_afmt_write_sad_regs(encoder);
 		dce6_afmt_write_latency_fields(encoder, mode);
+		dce6_afmt_write_sinkinfo(encoder);
 	} else {
 		evergreen_hdmi_write_sad_regs(encoder);
 		dce4_afmt_write_latency_fields(encoder, mode);
-- 
1.8.4.5


-- 
Stefan Brüns  /  Bergstraße 21  /  52062 Aachen
home: +49 241 53809034     mobile: +49 151 50412019