Re: [PATCH v2 1/4] drm/rockchip/dsi: check phy_cfg_clk only for RK3399

[Chris Zhong]

Hi John

On 03/16/2017 06:55 PM, John Keeping wrote:
> On Thu, 16 Mar 2017 11:31:44 +0800, Chris Zhong wrote:
>
> > For RK3399, the phy_cfg_clk is a required clock, if phy_cfg_clk is
> > disabled, MIPI phy can not work. Let's return a error if there is no
> > phy_cfg_clk in dts property, when the pdata match RK3399.
> >
> > Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>
> > ---
> >
> > Changes in v2: None
> >
> >   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 10 ++++------
> >   1 file changed, 4 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > index f84f9ae..11c4166 100644
> > --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> > @@ -1227,15 +1227,13 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
> >   		clk_disable_unprepare(dsi->pclk);
> >   	}
> >   
> > -	dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
> > -	if (IS_ERR(dsi->phy_cfg_clk)) {
> > -		ret = PTR_ERR(dsi->phy_cfg_clk);
> > -		if (ret != -ENOENT) {
> > +	if (pdata == &rk3399_mipi_dsi_drv_data) {
> This will get messy if the next SOC also needs phy_cfg_clk.  Can we do
> something like:
>
> 	if (pdata->flags & DW_MIPI_NEEDS_PHY_CFG_CLK) {
> 		...
Thanks, good idea. I think RK3368 mipi-dsi driver is on the way. :)


> > +		dsi->phy_cfg_clk = devm_clk_get(dev, "phy_cfg");
> > +		if (IS_ERR(dsi->phy_cfg_clk)) {
> > +			ret = PTR_ERR(dsi->phy_cfg_clk);
> >   			dev_err(dev, "Unable to get phy_cfg_clk: %d\n", ret);
> >   			return ret;
> >   		}
> > -		dsi->phy_cfg_clk = NULL;
> > -		dev_dbg(dev, "have not phy_cfg_clk\n");
> >   	}
> >   
> >   	ret = clk_prepare_enable(dsi->pllref_clk);

--
Chris Zhong