On 03/11/14 12:13, Johan Rudholm wrote:
> 2014-11-03 10:21 GMT+01:00 Adrian Hunter <[email protected]>:
>> On 24/10/14 15:46, Johan Rudholm wrote:
>>> The steps performed in mmc_do_hw_reset for eMMC:s after the hardware
>>> reset are very similar to those performed by mmc_power_up, so do a call
>>
>> They perform different functions. mmc_power_up() does nothing if the card
>> is powered up. To share the common code you need to create a function for
>> the common functionality which is setting the initial state e.g.
>>
>> int mmc_set_initial_state(struct mmc_host *host)
>> {
>> ...
>> }
>>
>> And call that from mmc_do_hw_reset and mmc_power_up.
>
> Thank you for the comment. What do you think of doing a complete
> mmc_power_cycle after having performed a (successful) reset? In this
> way we can simplify the SD card reset and we don't have to break out
> the common code from mmc_power_up. Naming discussion apart, something
> like this:
I would keep the concept of hw_reset separate from how that is
implemented i.e. whether it has anything to do with power.
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 486cda8..941f631 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2236,12 +2236,15 @@ static void mmc_hw_reset_for_init(struct mmc_host
> *host)
> static int mmc_do_reset(struct mmc_host *host, int check)
> {
> int ret;
> + struct mmc_card *card = host->card;
>
> if (!host->bus_ops || !host->bus_ops->power_reset ||
> host->bus_ops->power_reset(host,
> MMC_POWER_RESET_TEST))
> return -EOPNOTSUPP;
>
> ret = host->bus_ops->power_reset(host, check);
> + if (!ret && card)
> + mmc_power_cycle(host, card->ocr);
>
> pr_warning("%s: tried to reset card (%d)\n", mmc_hostname(host), ret);
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index ac5192c..900133a 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1794,8 +1794,6 @@ static int mmc_power_reset(struct mmc_host
> *host, int test)
> }
> }
>
> - mmc_power_up(host, card->ocr);
> -
> mmc_host_clk_release(host);
>
> return 0;
> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> index 9ad46b2..d5b8ee7 100644
> --- a/drivers/mmc/core/sd.c
> +++ b/drivers/mmc/core/sd.c
> @@ -1187,8 +1187,6 @@ static int mmc_sd_power_reset(struct mmc_host
> *host, int test)
> if (test == MMC_POWER_RESET_TEST)
> return 0;
>
> - mmc_power_cycle(host, card->ocr);
> -
> return 0;
> }
>
> //Johan
>
>
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