linux-kernel - Re: [PATCH v2 1/4] drm/rockchip/dsi: check phy_cfg

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Date:   Fri, 17 Mar 2017 09:19:06 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     John Keeping <john@...anate.com>
Cc:     linux-rockchip@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        Mark Yao <mark.yao@...k-chips.com>
Subject: Re: [PATCH v2 1/4] drm/rockchip/dsi: check phy_cfg_clk only for
 RK3399

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@...k-chips.com>
>> ---
>>
>> 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