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From:   Guillaume Ranquet <granquet@baylibre.com>
Date:   Fri, 14 Oct 2022 17:15:58 +0200
Subject: [PATCH v2 05/12] drm/mediatek: hdmi: make the cec dev optional
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To:     Chunfeng Yun <chunfeng.yun@mediatek.com>,
        David Airlie <airlied@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Jitao shi <jitao.shi@mediatek.com>, CK Hu <ck.hu@mediatek.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc:     Guillaume Ranquet <granquet@baylibre.com>, stuart.lee@mediatek.com,
        linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        linux-kernel@vger.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        mac.shen@mediatek.com, linux-mediatek@lists.infradead.org,
        dri-devel@lists.freedesktop.org
Precedence: bulk

Make cec device optional in order to support newer versions of the
hdmi IP which doesn't require it

Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c        |  8 +++--
 drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 54 ++++++++++++++++++++----------
 drivers/gpu/drm/mediatek/mtk_hdmi_common.h |  1 +
 3 files changed, 42 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 73bda2849196..85c6ebca36dd 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -927,10 +927,11 @@ void mtk_hdmi_clk_disable_audio_mt8183(struct mtk_hdmi *hdmi)
 static enum drm_connector_status
 mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
 {
-	bool connected;
+	bool connected = true;
 
 	mutex_lock(&hdmi->update_plugged_status_lock);
-	connected = mtk_cec_hpd_high(hdmi->cec_dev);
+	if (hdmi->cec_dev)
+		connected = mtk_cec_hpd_high(hdmi->cec_dev);
 	if (hdmi->plugged_cb && hdmi->codec_dev)
 		hdmi->plugged_cb(hdmi->codec_dev, connected);
 	mutex_unlock(&hdmi->update_plugged_status_lock);
@@ -1025,7 +1026,8 @@ static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
 			return ret;
 	}
 
-	mtk_cec_set_hpd_event(hdmi->cec_dev, mtk_hdmi_hpd_event, hdmi->dev);
+	if (hdmi->cec_dev)
+		mtk_cec_set_hpd_event(hdmi->cec_dev, mtk_hdmi_hpd_event, hdmi->dev);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
index 3f08d37b1af0..3635ca66817b 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.c
@@ -137,28 +137,18 @@ void mtk_hdmi_send_infoframe(struct mtk_hdmi *hdmi, u8 *buffer_spd, size_t bufsz
 	mtk_hdmi_setup_spd_infoframe(hdmi, buffer_spd, bufsz_spd, "mediatek", "On-chip HDMI");
 }
 
-int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
-			    const char *const *clk_names, size_t num_clocks)
+static int mtk_hdmi_get_cec_dev(struct mtk_hdmi *hdmi, struct device *dev, struct device_node *np)
 {
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	struct device_node *cec_np, *remote, *i2c_np;
+	int ret;
+	struct device_node *cec_np;
 	struct platform_device *cec_pdev;
 	struct regmap *regmap;
-	struct resource *mem;
-	int ret;
-
-	ret = mtk_hdmi_get_all_clk(hdmi, np, clk_names, num_clocks);
-	if (ret) {
-		dev_err(dev, "Failed to get all clks\n");
-		return ret;
-	}
 
 	/* The CEC module handles HDMI hotplug detection */
 	cec_np = of_get_compatible_child(np->parent, "mediatek,mt8173-cec");
 	if (!cec_np) {
 		dev_err(dev, "Failed to find CEC node\n");
-		return -EINVAL;
+		return -ENOTSUPP;
 	}
 
 	cec_pdev = of_find_device_by_node(cec_np);
@@ -168,7 +158,6 @@ int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
 		return -EPROBE_DEFER;
 	}
 	of_node_put(cec_np);
-	hdmi->cec_dev = &cec_pdev->dev;
 	/*
 	 * The mediatek,syscon-hdmi property contains a phandle link to the
 	 * MMSYS_CONFIG device and the register offset of the HDMI_SYS_CFG
@@ -177,12 +166,41 @@ int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
 	regmap = syscon_regmap_lookup_by_phandle(np, "mediatek,syscon-hdmi");
 	ret = of_property_read_u32_index(np, "mediatek,syscon-hdmi", 1, &hdmi->sys_offset);
 	if (IS_ERR(regmap))
-		ret = PTR_ERR(regmap);
+		return PTR_ERR(regmap);
 	if (ret) {
-		dev_err(dev, "Failed to get system configuration registers: %d\n", ret);
-		goto put_device;
+		dev_err(dev,
+				"Failed to get system configuration registers: %d\n", ret);
+		return ret;
 	}
+
 	hdmi->sys_regmap = regmap;
+	hdmi->cec_dev = &cec_pdev->dev;
+
+	return 0;
+}
+
+int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, struct platform_device *pdev,
+			    const char *const *clk_names, size_t num_clocks)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *remote, *i2c_np;
+	struct resource *mem;
+	int ret;
+
+	ret = mtk_hdmi_get_all_clk(hdmi, np, clk_names, num_clocks);
+	if (ret) {
+		dev_err(dev, "Failed to get all clks\n");
+		return ret;
+	}
+
+	ret = mtk_hdmi_get_cec_dev(hdmi, dev, np);
+	if (ret) {
+		if (ret == -ENOTSUPP)
+			dev_info(dev, "No CEC node found, continuing without");
+		else
+			goto put_device;
+	}
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_common.h b/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
index 7452bea91f9e..921bde150e11 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi_common.h
@@ -31,6 +31,7 @@
 struct mtk_hdmi_conf {
 	bool tz_disabled;
 	bool cea_modes_only;
+	bool has_cec;
 	unsigned long max_mode_clock;
 	const struct drm_bridge_funcs *bridge_funcs;
 	void (*mtk_hdmi_output_init)(struct mtk_hdmi *hdmi);

-- 
b4 0.11.0-dev