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SubjectRe: [PATCH 1/3] drm: bridge: synopsys/dw-hdmi: Enable cec clock
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On 14/10/17 10:16, Hans Verkuil wrote:
> 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>

Tested-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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