Re: [PATCH] mmc: tmio: introduce mask for 'always 1' bits

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Hello!

On 11/19/2018 04:13 PM, Wolfram Sang wrote:

> Some variants (namely Renesas SDHI) have bits in the STATS and IRQ_MASK
> registers which are 'always 1' and should be written as such. Introduce
> a seperate mask for this and apply it whenever such a register is

   Separate. :-)

> written.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
> ---
> 
> This is my response to BSP patches modifying all the register writes directly
> (BSP commits 2d339800bbc73d and f73d5eb86097df). This seems much more future
> proof to me.
> 
> Yamada-san: could you check if your HW has 'always 1' bits, too?
> 
> Tested on a R-Car M3-N. No regression and no performance impacts when reading
> large files from eMMC or UHS-SD cards.

[...]

MBR, Sergei



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