linux-kernel - [PATCH v2 8/8] drm/bridge: dw-hdmi-i2s: add .get

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Date:   Mon, 12 Aug 2019 14:07:26 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v2 8/8] drm/bridge: dw-hdmi-i2s: add .get_eld support

Provide the eld to the generic hdmi-codec driver.
This will let the driver enforce the maximum channel number and set the
channel allocation depending on the hdmi sink.

Cc: Jonas Karlman <jonas@...boo.se>
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h     |  1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 11 +++++++++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c           |  1 +
 3 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
index 63b5756f463b..cb07dc0da5a7 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
@@ -14,6 +14,7 @@ struct dw_hdmi_audio_data {
 
 struct dw_hdmi_i2s_audio_data {
 	struct dw_hdmi *hdmi;
+	u8 *eld;
 
 	void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
 	u8 (*read)(struct dw_hdmi *hdmi, int offset);
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
index b8ece9c1ba2c..62e737b81462 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 
 #include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_crtc.h>
 
 #include <sound/hdmi-codec.h>
 
@@ -121,6 +122,15 @@ static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
 	dw_hdmi_audio_disable(hdmi);
 }
 
+static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf,
+			       size_t len)
+{
+	struct dw_hdmi_i2s_audio_data *audio = data;
+
+	memcpy(buf, audio->eld, min(sizeof(MAX_ELD_BYTES), len));
+	return 0;
+}
+
 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 				  struct device_node *endpoint)
 {
@@ -144,6 +154,7 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
 	.hw_params	= dw_hdmi_i2s_hw_params,
 	.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
+	.get_eld	= dw_hdmi_i2s_get_eld,
 	.get_dai_id	= dw_hdmi_i2s_get_dai_id,
 };
 
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index bed4bb017afd..8df69c9dbfad 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2797,6 +2797,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		struct dw_hdmi_i2s_audio_data audio;
 
 		audio.hdmi	= hdmi;
+		audio.eld	= hdmi->connector.eld;
 		audio.write	= hdmi_writeb;
 		audio.read	= hdmi_readb;
 		hdmi->enable_audio = dw_hdmi_i2s_audio_enable;
-- 
2.21.0