linux-kernel - Re: [v1] drm/arm/mali-dp: Disable checking for required pixel clock rate

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Message-ID: <20190515154530.GX15144@e110455-lin.cambridge.arm.com>
Date:   Wed, 15 May 2019 16:45:31 +0100
From:   "liviu.dudau@....com" <liviu.dudau@....com>
To:     Wen He <wen.he_1@....com>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Leo Li <leoyang.li@....com>
Subject: Re: [v1] drm/arm/mali-dp: Disable checking for required pixel clock
 rate

Hi Wen,

On Wed, May 15, 2019 at 02:42:08AM +0000, Wen He wrote:
> Disable checking for required pixel clock rate if ARCH_LAYERSCPAE
> is enable.
> 
> Signed-off-by: Alison Wang <alison.wang@....com>
> Signed-off-by: Wen He <wen.he_1@....com>
> ---
> change in description:
> 	- This check that only supported one pixel clock required clock rate
> 	compare with dts node value. but we have supports 4 pixel clock
> 	for ls1028a board.

So, your DT says your pixel clock provider is a fixed clock? If you support
more than one rate, you should instead use a real provider for it. How do you
support the 4 pixel clocks?

Also, not sure what the paragraph above is meant to be. Should it be part of
the commit message?

Best regards,
Liviu


>  drivers/gpu/drm/arm/malidp_crtc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
> index 56aad288666e..bb79223d9981 100644
> --- a/drivers/gpu/drm/arm/malidp_crtc.c
> +++ b/drivers/gpu/drm/arm/malidp_crtc.c
> @@ -36,11 +36,13 @@ static enum drm_mode_status malidp_crtc_mode_valid(struct drm_crtc *crtc,
>  
>  	if (req_rate) {
>  		rate = clk_round_rate(hwdev->pxlclk, req_rate);
> +#ifndef CONFIG_ARCH_LAYERSCAPE
>  		if (rate != req_rate) {
>  			DRM_DEBUG_DRIVER("pxlclk doesn't support %ld Hz\n",
>  					 req_rate);
>  			return MODE_NOCLOCK;
>  		}
> +#endif
>  	}
>  
>  	return MODE_OK;
> -- 
> 2.17.1
> 

-- 
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