[PATCH v2] drm: bridge: synopsys/dw-hdmi: Enable cec clock

[PATCH v2] drm: bridge: synopsys/dw-hdmi: Enable cec clock

[Pierre-Hugues Husson]

The documentation already mentions "cec" optional clock, but
currently the driver doesn't enable it.

Changes:
v2:
- Separate ENOENT errors from others
- Propagate other errors (especially -EPROBE_DEFER)

Signed-off-by: Pierre-Hugues Husson <phh@phh.me>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index bf14214fa464..b31fc95d5fef 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -138,6 +138,7 @@ struct dw_hdmi {
 	struct device *dev;
 	struct clk *isfr_clk;
 	struct clk *iahb_clk;
+	struct clk *cec_clk;
 	struct dw_hdmi_i2c *i2c;
 
 	struct hdmi_data_info hdmi_data;
@@ -2382,6 +2383,27 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		goto err_isfr;
 	}
 
+	hdmi->cec_clk = devm_clk_get(hdmi->dev, "cec");
+	if (PTR_ERR(hdmi->cec_clk) == -ENOENT) {
+		hdmi->cec_clk = NULL;
+	} else if (IS_ERR(hdmi->cec_clk)) {
+		ret = PTR_ERR(hdmi->cec_clk);
+		if (ret != -EPROBE_DEFER) {
+			dev_err(hdmi->dev, "Cannot get HDMI cec clock: %d\n",
+					ret);
+		}
+
+		hdmi->cec_clk = NULL;
+		goto err_iahb;
+	} else {
+		ret = clk_prepare_enable(hdmi->cec_clk);
+		if (ret) {
+			dev_err(hdmi->dev, "Cannot enable HDMI cec clock: %d\n",
+					ret);
+			goto err_iahb;
+		}
+	}
+
 	/* Product and revision IDs */
 	hdmi->version = (hdmi_readb(hdmi, HDMI_DESIGN_ID) << 8)
 		      | (hdmi_readb(hdmi, HDMI_REVISION_ID) << 0);
@@ -2518,6 +2540,8 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		cec_notifier_put(hdmi->cec_notifier);
 
 	clk_disable_unprepare(hdmi->iahb_clk);
+	if (hdmi->cec_clk)
+		clk_disable_unprepare(hdmi->cec_clk);
 err_isfr:
 	clk_disable_unprepare(hdmi->isfr_clk);
 err_res:
@@ -2541,6 +2565,8 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
 
 	clk_disable_unprepare(hdmi->iahb_clk);
 	clk_disable_unprepare(hdmi->isfr_clk);
+	if (hdmi->cec_clk)
+		clk_disable_unprepare(hdmi->cec_clk);
 
 	if (hdmi->i2c)
 		i2c_del_adapter(&hdmi->i2c->adap);
-- 
2.14.1

[PATCH v2] drm: bridge: synopsys/dw-hdmi: Enable cec clock

[Heiko Stuebner]

Hi Pierre,

Am Freitag, 20. Oktober 2017, 21:18:38 CEST schrieb Pierre-Hugues Husson:
> The documentation already mentions "cec" optional clock, but
> currently the driver doesn't enable it.
> 
> Changes:
> v2:
> - Separate ENOENT errors from others
> - Propagate other errors (especially -EPROBE_DEFER)
> 
> Signed-off-by: Pierre-Hugues Husson <phh@phh.me>
> ---

it looks like you might be missing some important people in your recipient list.
get_maintainer.pl shows me:
- Archit Taneja <architt@codeaurora.org> (maintainer:DRM DRIVERS FOR BRIDGE CHIPS)
- Andrzej Hajda <a.hajda@samsung.com> (maintainer:DRM DRIVERS FOR BRIDGE CHIPS)
- dri-devel at lists.freedesktop.org (open list:DRM DRIVERS)

So these should definitly be included in your recipients, as they're the
ones that will apply your patch :-)

One further nit below.


>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index bf14214fa464..b31fc95d5fef 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -138,6 +138,7 @@ struct dw_hdmi {
>  	struct device *dev;
>  	struct clk *isfr_clk;
>  	struct clk *iahb_clk;
> +	struct clk *cec_clk;
>  	struct dw_hdmi_i2c *i2c;
>  
>  	struct hdmi_data_info hdmi_data;
> @@ -2382,6 +2383,27 @@ __dw_hdmi_probe(struct platform_device *pdev,
>  		goto err_isfr;
>  	}
>  
> +	hdmi->cec_clk = devm_clk_get(hdmi->dev, "cec");
> +	if (PTR_ERR(hdmi->cec_clk) == -ENOENT) {
> +		hdmi->cec_clk = NULL;
> +	} else if (IS_ERR(hdmi->cec_clk)) {
> +		ret = PTR_ERR(hdmi->cec_clk);
> +		if (ret != -EPROBE_DEFER) {
> +			dev_err(hdmi->dev, "Cannot get HDMI cec clock: %d\n",
> +					ret);
> +		}

braces around the single dev_err are not necessary.

Heiko