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SubjectRe: [PATCH 1/3] drm: bridge: synopsys/dw-hdmi: Enable cec clock
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On 10/14/2017 12:53 AM, Pierre-Hugues Husson wrote:
> The documentation already mentions "cec" optional clock, but
> currently the driver doesn't enable it.
>
> Signed-off-by: Pierre-Hugues Husson <phh@phh.me>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Thanks!

Hans

> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index bf14214fa464..5007cdf43131 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 +2383,18 @@ __dw_hdmi_probe(struct platform_device *pdev,
> goto err_isfr;
> }
>
> + hdmi->cec_clk = devm_clk_get(hdmi->dev, "cec");
> + if (IS_ERR(hdmi->cec_clk)) {
> + hdmi->cec_clk = NULL;
> + } else {
> + ret = clk_prepare_enable(hdmi->cec_clk);
> + if (ret) {
> + dev_err(hdmi->dev, "Cannot enable HDMI cec clock: %d\n",
> + ret);
> + goto err_res;
> + }
> + }
> +
> /* Product and revision IDs */
> hdmi->version = (hdmi_readb(hdmi, HDMI_DESIGN_ID) << 8)
> | (hdmi_readb(hdmi, HDMI_REVISION_ID) << 0);
> @@ -2518,6 +2531,8 @@ __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 +2556,8 @@ 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);
>

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