Re: [PATCH] mmc: tmio: fix access width of Block Count Register

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On Thu, Feb 21, 2019 at 08:38:05PM +0100, Wolfram Sang wrote:
> From: Takeshi Saito <takeshi.saito.xv@xxxxxxxxxxx>
> 
> In R-Car Gen2 or later, the maximum number of transfer blocks are
> changed from 0xFFFF to 0xFFFFFFFF. Therefore, Block Count Register
> should use iowrite32().
> 
> If another system (U-boot, Hypervisor OS, etc) uses bit[31:16], this
> value will not be cleared. So, SD/MMC card initialization fails.
> 
> So, check for the bigger register and use apropriate write. Also, mark
> the register as extended on Gen2.
> 
> Signed-off-by: Takeshi Saito <takeshi.saito.xv@xxxxxxxxxxx>
> [wsa: use max_blk_count in if(), add Gen2, update commit message]
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxx

Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>



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