Hi Geert,
On Tuesday, July 11, 2017, Geert Uytterhoeven wrote:
> > zeroing out the bottom 2 bits of count for out math.
>
> s/out/our/
Thank you!
> > - buf8 = (u8 *)(buf + (count >> 2));
> > + buf8 = (u8 *)buf + (count & ~3);
> > count %= 4;
>
> While correct, this is IMHO still difficult to understand for the casual
> reader.
>
> Given the code before casts to "u32 *", and uses "count >>2", and the code
> after also casts to "u32 *", what about getting rid of all casts like:
>
> u32 data = 0;
> u32 *buf32 = buf;
>
> if (is_read)
> sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32,
> count >> 2);
> else
> sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32,
> count >> 2);
>
> /* if count was multiple of 4 */
> if (!(count & 0x3))
> return;
>
> buf32 += count >> 2;
> count %= 4;
>
> if (is_read) {
> sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1);
> memcpy(buf32, &data, count);
> } else {
> memcpy(&data, buf32, count);
> sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1);
> }
>
> return;
> }
>
Good idea. I just tried it and it seems to work. I'll resend a patch.
> u32 *buf32 = buf;
GCC didn't like this line without casting buf to a u32 *. It threw an
error, not just a warning. Go figure.
Question:
> u32 data = 0;
Any special reason why you are initializing this to 0????
Thank you,
Chris
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