diff mbox series

[05/22] drm/rockchip: dw_hdmi: Add support for hclk

Message ID 20211220110630.3521121-6-s.hauer@pengutronix.de (mailing list archive)
State New
Headers show
Series drm/rockchip: RK356x VOP2 support | expand

Commit Message

Sascha Hauer Dec. 20, 2021, 11:06 a.m. UTC
The rk3568 HDMI has an additional clock that needs to be enabled for the
HDMI controller to work. The purpose of that clock is not clear. It is
named "hclk" in the downstream driver, so use the same name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 3d7c3f6fdf223..b9928e622adf5 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -76,6 +76,7 @@  struct rockchip_hdmi {
 	const struct rockchip_hdmi_chip_data *chip_data;
 	struct clk *ref_clk;
 	struct clk *grf_clk;
+	struct clk *hclk_clk;
 	struct dw_hdmi *hdmi;
 	struct regulator *avdd_0v9;
 	struct regulator *avdd_1v8;
@@ -226,6 +227,16 @@  static int rockchip_hdmi_parse_dt(struct rockchip_hdmi *hdmi)
 		return PTR_ERR(hdmi->grf_clk);
 	}
 
+	hdmi->hclk_clk = devm_clk_get(hdmi->dev, "hclk");
+	if (PTR_ERR(hdmi->hclk_clk) == -ENOENT) {
+		hdmi->hclk_clk = NULL;
+	} else if (PTR_ERR(hdmi->hclk_clk) == -EPROBE_DEFER) {
+		return -EPROBE_DEFER;
+	} else if (IS_ERR(hdmi->hclk_clk)) {
+		DRM_DEV_ERROR(hdmi->dev, "failed to get hclk_clk clock\n");
+		return PTR_ERR(hdmi->hclk_clk);
+	}
+
 	hdmi->avdd_0v9 = devm_regulator_get(hdmi->dev, "avdd-0v9");
 	if (IS_ERR(hdmi->avdd_0v9))
 		return PTR_ERR(hdmi->avdd_0v9);
@@ -593,6 +604,13 @@  static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 		goto err_clk;
 	}
 
+	ret = clk_prepare_enable(hdmi->hclk_clk);
+	if (ret) {
+		DRM_DEV_ERROR(hdmi->dev, "Failed to enable HDMI hclk clock: %d\n",
+			      ret);
+		goto err_clk;
+	}
+
 	if (hdmi->chip_data == &rk3568_chip_data) {
 		regmap_write(hdmi->regmap, RK3568_GRF_VO_CON1,
 			     HIWORD_UPDATE(RK3568_HDMI_SDAIN_MSK |