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SubjectRe: [PATCH v3] drm: bridge: synopsys/dw-hdmi: Enable cec clock
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Hi,

On 11/20/2017 06:00 PM, Hans Verkuil wrote:
> I didn't see this merged for 4.15, is it too late to include this?
> All other changes needed to get CEC to work on rk3288 and rk3399 are all merged.

Sorry for the late reply. I was out last week.

Dave recently sent the second pull request for 4.15, so I think it would be hard to get it
in the merge window now. We could target it for the 4.15-rcs since it is preventing the
feature from working. Is it possible to rephrase the commit message a bit so that it's clear
that we need it for CEC to work?

Thanks,
Archit

>
> Regards,
>
> Hans
>
> On 10/26/2017 08:19 PM, Pierre-Hugues Husson wrote:
>> The documentation already mentions "cec" optional clock, but
>> currently the driver doesn't enable it.
>>
>> Changes:
>> v3:
>> - Drop useless braces
>>
>> 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 | 25 +++++++++++++++++++++++++
>> 1 file changed, 25 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> index bf14214fa464..d82b9747a979 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 +2383,26 @@ __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 +2539,8 @@ __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 +2564,8 @@ 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);
>>
>

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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