linux-kernel - Re:Re: [PATCH 1/2] drm/rockchip: vop2: fix rk3588 dp+dsi maxclk verification

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Message-ID: <72672888.8f9.1932826549b.Coremail.andyshrk@163.com>
Date: Thu, 14 Nov 2024 08:50:20 +0800 (CST)
From: "Andy Yan" <andyshrk@....com>
To: "Quentin Schulz" <quentin.schulz@...rry.de>
Cc: "Heiko Stuebner" <heiko@...ech.de>, hjc@...k-chips.com, 
	andy.yan@...k-chips.com, dri-devel@...ts.freedesktop.org, 
	linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	"Heiko Stuebner" <heiko.stuebner@...rry.de>
Subject: Re:Re: [PATCH 1/2] drm/rockchip: vop2: fix rk3588 dp+dsi maxclk
 verification


Hi,

At 2024-05-06 15:44:36, "Quentin Schulz" <quentin.schulz@...rry.de> wrote:
>Hi Heiko,
>
>On 4/25/24 9:55 PM, Heiko Stuebner wrote:
>> From: Heiko Stuebner <heiko.stuebner@...rry.de>
>> 
>> The clock is in Hz while the value checked against is in kHz, so
>> actual frequencies will never be able to be below to max value.
>> Fix this by specifying the max-value in Hz too.
>> 
>> Fixes: 5a028e8f062f ("drm/rockchip: vop2: Add support for rk3588")
>> Signed-off-by: Heiko Stuebner <heiko.stuebner@...rry.de>
>> ---
>>   drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> index 9bee1fd88e6a2..523880a4e8e74 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
>> @@ -1719,7 +1719,7 @@ static unsigned long rk3588_calc_cru_cfg(struct vop2_video_port *vp, int id,
>>   		else
>>   			dclk_out_rate = v_pixclk >> 2;
>>   
>> -		dclk_rate = rk3588_calc_dclk(dclk_out_rate, 600000);
>> +		dclk_rate = rk3588_calc_dclk(dclk_out_rate, 600000000);
>>   		if (!dclk_rate) {
>>   			drm_err(vop2->drm, "DP dclk_out_rate out of range, dclk_out_rate: %ld KHZ\n",
>
>It seems the error message is incorrect as well and should be saying Hz 
>instead of KHz. (note also the lowercase z).

I think kHz is fine, we can find many siminary usage in drm:

drivers/gpu/drm/drm_vblank.c
656:    drm_dbg_core(dev, "crtc %u: clock %d kHz framedur %d linedur %d\n",
>
>>   				dclk_out_rate);
>> @@ -1736,7 +1736,7 @@ static unsigned long rk3588_calc_cru_cfg(struct vop2_video_port *vp, int id,
>>   		 * dclk_rate = N * dclk_core_rate N = (1,2,4 ),
>>   		 * we get a little factor here
>>   		 */
>> -		dclk_rate = rk3588_calc_dclk(dclk_out_rate, 600000);
>> +		dclk_rate = rk3588_calc_dclk(dclk_out_rate, 600000000);
>>   		if (!dclk_rate) {
>>   			drm_err(vop2->drm, "MIPI dclk out of range, dclk_out_rate: %ld KHZ\n",
>
>Ditto.
>
>Otherwise,
>
>Reviewed-by: Quentin Schulz <quentin.schulz@...rry.de>

Acked-by: Andy Yan<andyshrk@....com>

>
>Thanks!
>Quentin