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SubjectRe: [PATCH v9 6/9] i3c: master: Add driver for Cadence IP
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On 10/24/18 1:20 PM, Boris Brezillon wrote:
> Hi Arnd,
>
> On Mon, 22 Oct 2018 15:34:01 +0200
> Boris Brezillon <boris.brezillon@bootlin.com> wrote:
>
>
>> +
>> +static void cdns_i3c_master_rd_from_rx_fifo(struct cdns_i3c_master *master,
>> + u8 *bytes, int nbytes)
>> +{
>> + readsl(master->regs + RX_FIFO, bytes, nbytes / 4);
>
> Vitor reported a problem with readsl(): this function expects the 2nd
> argument to be aligned on 32-bit, which is not guaranteed here. Unless
> you see a better solution, I'll switch back to a loop doing:
>
> for (i = 0; i < nbytes; i += 4) {
> u32 tmp = __raw_readl(...);

Pls, do not use __raw io.

> memcpy(bytes + i, &tmp,
> nbytes - i > 4 ? 4 : nbytes - i);
> }
>
>> + if (nbytes & 3) {
>> + u32 tmp;
>> +
>> + readsl(master->regs + RX_FIFO, &tmp, 1);
>> + memcpy(bytes + (nbytes & ~3), &tmp, nbytes & 3);
>> + }
>> +}
>
> Regards,
>
> Boris
>

--
regards,
-grygorii

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