Hello Jaehoon,
On Fri, January 20, 2012 8:48 am, Jaehoon Chung wrote:
...
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index 4d41fa9..109d0f0 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -392,13 +392,22 @@ int mmc_switch(struct mmc_card *card, u8 set, u8
> index, u8 value,
> (index << 16) |
> (value << 8) |
> set;
> - cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
> + cmd.flags = MMC_CMD_AC;
> + if (index == EXT_CSD_BKOPS_START &&
> + card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
> + cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
> + else
> + cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
It is not good to use conditional on 'index', because this function
(mmc_switch)
is generic and in case you want functionality like here "in some cases cmd
should not wait for PROG_DONE" it is better to use different approach:
1. Use internal function with additional parameter wait_for_prog_done:
int __mmc_switch(struct mmc_card *card, u8 set, u8 index,
unsigned int timeout_ms, u8 wait_for_prog_done)
{
...
if(wait_for_prog_done)
cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
else
cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
...
}
2. implement mmc_switch through __mmc_switch()
int mmc_switch(struct mmc_card *card, u8 set, u8 index,
unsigned int timeout_ms)
{
return __mmc_switch(card, set, index, timeout_ms, 0);
}
3. when you need to start bkops, use: __mmc_switch(card, set, index,
timeout_ms, 1);
Does it make sense?
--
Konstantin Dorfman
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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