Hi Tobias,

On 07/05/2016 05:31 PM, 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@ed-chemnitz.de

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;

ERROR: space prohibited after that open parenthesis '(' #31: FILE: drivers/mmc/sunxi_mmc.c:272: + unsigned timeout_usecs = ( byte_cnt >> 8 ) * 1000;

ERROR: space prohibited before that close parenthesis ')' #31: FILE: drivers/mmc/sunxi_mmc.c:272: + unsigned timeout_usecs = ( byte_cnt >> 8 ) * 1000;

Best Regards, Jaehoon Chung

• 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)