Re: [PATCH v2 1/1] drm/mediatek: Filter modes according to hardware capability

["CK Hu (胡俊光)" <ck.hu@mediatek.com>]

+ Jason

On Wed, 2024-11-27 at 15:28 +0100, Michał Kopeć wrote:
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> 
> (Re-sending because Shawn's @google email is inactive)
> 
> Hi Shawn,
> 
> I'm a new owner of the Chromebook Ciri (MT8188) and have run into an
> issue which I believe is related to this patch.
> 
> I'm attempting to use a 3440x1440 144Hz monitor over DisplayPort, but
> the available resolutions are limited to 2560x1440@120Hz. I found this
> patch, then I confirmed with the monitor's EDID that i am indeed
> reaching data rates above 8250 (though minimally) in higher resolution
> modes.
> 
> I wanted to ask about this comment:
> 
>  > The proposed formula is only one way to estimate whether our SoC
>  > supports the mode setting. The basic idea behind it is just to check
>  > if the data rate requirement is too high (directly proportional to
>  > pixel clock, inversely proportional to vbp). Please adjust the
>  > function if it doesn't fit your situation in the future.
> 
> - Can you confirm if the reference number 8250 is the hard limit of the
> hardware?
> - Could you suggest other formulae that could work for my use case? I'd
> be happy to implement and test on my end but as I don't have access to
> MTK documentation, I don't know the actual limits of the hardware and
> how to deal with them
> 
> Regards,
> Michał Kopeć
> 
> 
> 
>