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From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Thu, 30 May 2024 02:12:30 +0300
Subject: [PATCH v3 7/7] drm/msm/hdmi: also send the SPD and HDMI Vendor
 Specific InfoFrames
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Message-Id: <20240530-bridge-hdmi-connector-v3-7-a1d184d68fe3@linaro.org>
References: <20240530-bridge-hdmi-connector-v3-0-a1d184d68fe3@linaro.org>
In-Reply-To: <20240530-bridge-hdmi-connector-v3-0-a1d184d68fe3@linaro.org>
To: Andrzej Hajda <andrzej.hajda@intel.com>, 
 Neil Armstrong <neil.armstrong@linaro.org>, Robert Foss <rfoss@kernel.org>, 
 Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, 
 Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@gmail.com>, 
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, 
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>, 
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, 
 Rob Clark <robdclark@gmail.com>, Abhinav Kumar <quic_abhinavk@quicinc.com>, 
 Sean Paul <sean@poorly.run>, Marijn Suijten <marijn.suijten@somainline.org>
Cc: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, 
 freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, 
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Extend the driver to send SPD and HDMI Vendor Specific InfoFrames.

While the HDMI block has special block to send HVS InfoFrame, use
GENERIC0 block instead. VENSPEC_INFO registers pack frame data in a way
that requires manual repacking in the driver, while GENERIC0 doesn't
have such format requirements. The msm-4.4 kernel uses GENERIC0 to send
HDR InfoFrame which we do not at this point anyway.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 93 ++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
index 3ac63edbf5bb..79ce3b6d1222 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_bridge.c
@@ -68,6 +68,8 @@ static void power_off(struct drm_bridge *bridge)
 }
 
 #define AVI_IFRAME_LINE_NUMBER 1
+#define SPD_IFRAME_LINE_NUMBER 1
+#define VENSPEC_IFRAME_LINE_NUMBER 3
 
 static int msm_hdmi_config_avi_infoframe(struct hdmi *hdmi,
 					 const u8 *buffer, size_t len)
@@ -141,6 +143,74 @@ static int msm_hdmi_config_audio_infoframe(struct hdmi *hdmi,
 	return 0;
 }
 
+static int msm_hdmi_config_spd_infoframe(struct hdmi *hdmi,
+					 const u8 *buffer, size_t len)
+{
+	u32 buf[7] = {};
+	u32 val;
+	int i;
+
+	if (len != HDMI_INFOFRAME_SIZE(SPD) || len - 3 > sizeof(buf)) {
+		DRM_DEV_ERROR(&hdmi->pdev->dev,
+			"failed to configure SPD infoframe\n");
+		return -EINVAL;
+	}
+
+	/* checksum gets written together with the body of the frame */
+	hdmi_write(hdmi, REG_HDMI_GENERIC1_HDR,
+		   buffer[0] |
+		   buffer[1] << 8 |
+		   buffer[2] << 16);
+
+	memcpy(buf, &buffer[3], len - 3);
+
+	for (i = 0; i < ARRAY_SIZE(buf); i++)
+		hdmi_write(hdmi, REG_HDMI_GENERIC1(i), buf[i]);
+
+	val = hdmi_read(hdmi, REG_HDMI_GEN_PKT_CTRL);
+	val |= HDMI_GEN_PKT_CTRL_GENERIC1_SEND |
+		 HDMI_GEN_PKT_CTRL_GENERIC1_CONT |
+		 HDMI_GEN_PKT_CTRL_GENERIC1_LINE(SPD_IFRAME_LINE_NUMBER);
+	hdmi_write(hdmi, REG_HDMI_GEN_PKT_CTRL, val);
+
+	return 0;
+}
+
+static int msm_hdmi_config_hdmi_infoframe(struct hdmi *hdmi,
+					  const u8 *buffer, size_t len)
+{
+	u32 buf[7] = {};
+	u32 val;
+	int i;
+
+	if (len < HDMI_INFOFRAME_HEADER_SIZE + HDMI_VENDOR_INFOFRAME_SIZE ||
+	    len - 3 > sizeof(buf)) {
+		DRM_DEV_ERROR(&hdmi->pdev->dev,
+			"failed to configure HDMI infoframe\n");
+		return -EINVAL;
+	}
+
+	/* checksum gets written together with the body of the frame */
+	hdmi_write(hdmi, REG_HDMI_GENERIC0_HDR,
+		   buffer[0] |
+		   buffer[1] << 8 |
+		   buffer[2] << 16);
+
+	memcpy(buf, &buffer[3], len - 3);
+
+	for (i = 0; i < ARRAY_SIZE(buf); i++)
+		hdmi_write(hdmi, REG_HDMI_GENERIC0(i), buf[i]);
+
+	val = hdmi_read(hdmi, REG_HDMI_GEN_PKT_CTRL);
+	val |= HDMI_GEN_PKT_CTRL_GENERIC0_SEND |
+		 HDMI_GEN_PKT_CTRL_GENERIC0_CONT |
+		 HDMI_GEN_PKT_CTRL_GENERIC0_UPDATE |
+		 HDMI_GEN_PKT_CTRL_GENERIC0_LINE(VENSPEC_IFRAME_LINE_NUMBER);
+	hdmi_write(hdmi, REG_HDMI_GEN_PKT_CTRL, val);
+
+	return 0;
+}
+
 static int msm_hdmi_bridge_clear_infoframe(struct drm_bridge *bridge,
 					   enum hdmi_infoframe_type type)
 {
@@ -175,6 +245,25 @@ static int msm_hdmi_bridge_clear_infoframe(struct drm_bridge *bridge,
 
 		break;
 
+	case HDMI_INFOFRAME_TYPE_SPD:
+		val = hdmi_read(hdmi, REG_HDMI_GEN_PKT_CTRL);
+		val &= ~(HDMI_GEN_PKT_CTRL_GENERIC1_SEND |
+			 HDMI_GEN_PKT_CTRL_GENERIC1_CONT |
+			 HDMI_GEN_PKT_CTRL_GENERIC1_LINE__MASK);
+		hdmi_write(hdmi, REG_HDMI_GEN_PKT_CTRL, val);
+
+		break;
+
+	case HDMI_INFOFRAME_TYPE_VENDOR:
+		val = hdmi_read(hdmi, REG_HDMI_GEN_PKT_CTRL);
+		val &= ~(HDMI_GEN_PKT_CTRL_GENERIC0_SEND |
+			 HDMI_GEN_PKT_CTRL_GENERIC0_CONT |
+			 HDMI_GEN_PKT_CTRL_GENERIC0_UPDATE |
+			 HDMI_GEN_PKT_CTRL_GENERIC0_LINE__MASK);
+		hdmi_write(hdmi, REG_HDMI_GEN_PKT_CTRL, val);
+
+		break;
+
 	default:
 		drm_dbg_driver(hdmi_bridge->base.dev, "Unsupported infoframe type %x\n", type);
 	}
@@ -196,6 +285,10 @@ static int msm_hdmi_bridge_write_infoframe(struct drm_bridge *bridge,
 		return msm_hdmi_config_avi_infoframe(hdmi, buffer, len);
 	case HDMI_INFOFRAME_TYPE_AUDIO:
 		return msm_hdmi_config_audio_infoframe(hdmi, buffer, len);
+	case HDMI_INFOFRAME_TYPE_SPD:
+		return msm_hdmi_config_spd_infoframe(hdmi, buffer, len);
+	case HDMI_INFOFRAME_TYPE_VENDOR:
+		return msm_hdmi_config_hdmi_infoframe(hdmi, buffer, len);
 	default:
 		drm_dbg_driver(hdmi_bridge->base.dev, "Unsupported infoframe type %x\n", type);
 		return 0;

-- 
2.39.2