[U-Boot] [RESEND PATCH] sunxi: mmc: increase status register polling rate for data transfers
Hans de Goede
hdegoede at redhat.com
Sat Jul 9 12:23:56 CEST 2016
Hi,
On 08-07-16 12:40, Tobias Doerffel wrote:
> With a recent bunch of SD3.0 cards in our A20-based board we
> experienced data transfer rates of about 250 KiB/s instead of 10 MiB/s
> with previous cards from the same vendor (both 4 GB/class 10). By
> increasing status register polling rate from 1 kHz to 1 MHz we were
> able to reach the original transfer rates again. With the old cards
> we now even reach about 16 MiB/s.
>
> Signed-off-by: Tobias Doerffel <tobias.doerffel at ed-chemnitz.de>
Thanks, this tremendously speeds up boot on some of my boards, good stuff!
I've merge this locally and it should show up in u-boot-sunxi/next later
today.
Regards,
Hans
> ---
> drivers/mmc/sunxi_mmc.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
> index ce2dc4a..36da3b3 100644
> --- a/drivers/mmc/sunxi_mmc.c
> +++ b/drivers/mmc/sunxi_mmc.c
> @@ -269,18 +269,18 @@ static int mmc_trans_data_by_cpu(struct mmc *mmc, struct mmc_data *data)
> unsigned i;
> unsigned *buff = (unsigned int *)(reading ? data->dest : data->src);
> unsigned byte_cnt = data->blocksize * data->blocks;
> - unsigned timeout_msecs = byte_cnt >> 8;
> - if (timeout_msecs < 2000)
> - timeout_msecs = 2000;
> + unsigned timeout_usecs = (byte_cnt >> 8) * 1000;
> + if (timeout_usecs < 2000000)
> + timeout_usecs = 2000000;
>
> /* Always read / write data through the CPU */
> setbits_le32(&mmchost->reg->gctrl, SUNXI_MMC_GCTRL_ACCESS_BY_AHB);
>
> for (i = 0; i < (byte_cnt >> 2); i++) {
> while (readl(&mmchost->reg->status) & status_bit) {
> - if (!timeout_msecs--)
> + if (!timeout_usecs--)
> return -1;
> - udelay(1000);
> + udelay(1);
> }
>
> if (reading)
>
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