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sunxi: mmc: increase status register polling rate for data transfers

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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@ed-chemnitz.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Tobias Doerffel 2016-07-08 12:40:14 +02:00 committed by Hans de Goede
parent 320e0570e6
commit 26c0c15786
1 changed files with 5 additions and 5 deletions
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10
drivers/mmc/sunxi_mmc.c
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@ -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)