On 11/26/2017 01:48 AM, Pierre-Hugues Husson wrote:
> Support the "cec" optional clock. The documentation already mentions "cec"
> optional clock and it is used by several boards, but currently the driver
> doesn't enable it, thus preventing cec from working on those boards.
>
> And even worse: a /dev/cecX device will appear for those boards, but it
> won't be functioning without configuring this clock.
Thanks for the updating the commit message. I will queue this to drm-misc-fixes once
it's updated with the 4.15-rc1 tag.
Thanks,
Archit
>
> Changes:
> v4:
> - Change commit message to stress the importance of this patch
>
> v3:
> - Drop useless braces
>
> v2:
> - Separate ENOENT errors from others
> - Propagate other errors (especially -EPROBE_DEFER)
>
> Signed-off-by: Pierre-Hugues Husson <phh at 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);
>
--
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