[PATCH 2/3] drm/tiny: ili9486: Do not assume 8-bit only SPI controllers
Carlo Caione
carlo at caione.org
Fri Nov 18 11:02:32 PST 2022
On 18/11/2022 16:44, Mark Brown wrote:
>> The problem arrives when your controller does support 16-bits, so
>> your data is not swapped, but you still put the data on the bus
>> with 8-bit transfers.
>
> Why would you need to use 8 bit transfers if the controller supports
> 16 bits?
No idea why this driver is forcing 8-bit transfers when the controller
supports 16-bits (this is what this patch is fixing).
My theory is that this driver was written with the Raspberry Pi HATs in
mind and (AFAICT) the RPi has an 8-bit only SPI controller so the driver
author didn't bother with anything different.
--
Carlo Caione
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