RE: [PATCH RFC/RFT 1/2] mmc: tmio: Add 64-bit read/write support for SD_BUF0 in polling mode

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Hi Wolfram Sang,

Thanks for the feedback.

> -----Original Message-----
> From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
> Sent: 21 July 2025 12:25
> Subject: Re: [PATCH RFC/RFT 1/2] mmc: tmio: Add 64-bit read/write support for SD_BUF0 in polling mode
> 
> 
> > Maybe I can guard these functions/caller using CONFIG_ARM64 as it is
> > applicable only to GEN3 Platforms. Similar issue seen on [1]??
> >
> > [1] https://lkml.iu.edu/hypermail/linux/kernel/2209.2/04657.html
> 
> Maybe just use 64BIT as the guard? Seems a tad more precise to me.
> 
> Other than that, looks good to me:
> 
> Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
> 
> Wasn't able to test this yet, though, sorry. I hope for tomorrow, but no promises.

Ok, will guard like this in next version.

#ifdef CONFIG_64BIT
static inline void sd_ctrl_read64_rep(struct tmio_mmc_host *host, int addr,
				      u64 *buf, int count)
{
	ioread64_rep(host->ctl + (addr << host->bus_shift), buf, count);
}

static inline void sd_ctrl_write64_rep(struct tmio_mmc_host *host, int addr,
				       const u64 *buf, int count)
{
	iowrite64_rep(host->ctl + (addr << host->bus_shift), buf, count);
}
#else
static inline void sd_ctrl_read64_rep(struct tmio_mmc_host *host, int addr,
				      u64 *buf, int count)
{
}

static inline void sd_ctrl_write64_rep(struct tmio_mmc_host *host, int addr,
				       const u64 *buf, int count)
{
}
#endif


Cheers,
Biju





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