On 28 January 2014 11:51, Jaehoon Chung <jh80.ch...@samsung.com> wrote:
> Dear, Ulf.
>
> On 01/28/2014 07:32 PM, Ulf Hansson wrote:
>> On 28 January 2014 09:24, Jaehoon Chung <jh80.ch...@samsung.com> wrote:
>>> Some SoC is used the broken card-detection.
>>> And it should be also used the "non-removable".
>>> Even if card is "non-removable", it didn't always use the cd-gpio.
>>>
>>> If it's used only broken-cd, then card-detect interrupt is polling.
>>>
>>> Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
>>> ---
>>> drivers/mmc/core/core.c | 4 ++--
>>> drivers/mmc/core/host.c | 6 +++---
>>> 2 files changed, 5 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>>> index 098374b..df732aa 100644
>>> --- a/drivers/mmc/core/core.c
>>> +++ b/drivers/mmc/core/core.c
>>> @@ -2460,8 +2460,8 @@ void mmc_rescan(struct work_struct *work)
>>> */
>>> mmc_bus_put(host);
>>>
>>> - if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->get_cd &&
>>> - host->ops->get_cd(host) == 0) {
>>> + if (host->ops->get_cd && host->ops->get_cd(host) == 0 &&
>>> + !(host->caps & MMC_CAP_NONREMOVABLE)) {
>>
>> What's the difference here?
>
> eMMC is non-removable card. So i added the "non-removable" property at dt
> file.
> Then first checking !(host->caps & MMC_CAP_NONREMOVABLE), and didn't call
> get_cd().
> In case of dw-mmc.c, after calling get_cd(), CARD_PRESENT bit is set at
> dw_mci_get_cd().
> I didn't check other driver how it work.
> If you didn't this change, i will change the dw-mmc controller.
Thanks for the clarification.
I would then suggest you to change in dw-mmc instead, since I think
using the MMC_CAP_NONREMOVABLE flag, indicates that the .get_cd
callback is not needed.
Kind regards
Ulf Hansson
>
>>
>>> mmc_claim_host(host);
>>> mmc_power_off(host);
>>> mmc_release_host(host);
>>> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
>>> index 4b81c93..52a64fe 100644
>>> --- a/drivers/mmc/core/host.c
>>> +++ b/drivers/mmc/core/host.c
>>> @@ -356,6 +356,9 @@ int mmc_of_parse(struct mmc_host *host)
>>> * configuration is performed.
>>> */
>>>
>>> + if (of_find_property(np, "broken-cd", &len))
>>> + host->caps |= MMC_CAP_NEEDS_POLL;
>>> +
>>
>> No. There are no meaning in using MMC_CAP_NEEDS_POLL in conjunction
>> with MMC_CAP_NONREMOVABLE.
>>
>> Using MMC_CAP_NONREMOVABLE, will allow mmc_rescan to detect a card -
>> only for one iteration. Thus MMC_CAP_NEEDS_POLL will have no effect.
>
> Sorry. You're right. It's no meaning. I will maintain the original code.
>
> Best Regards,
> Jaehoon Chung
>>
>> Kind regards
>> Uffe
>>
>>
>>> /* Parse Card Detection */
>>> if (of_find_property(np, "non-removable", &len)) {
>>> host->caps |= MMC_CAP_NONREMOVABLE;
>>> @@ -364,9 +367,6 @@ int mmc_of_parse(struct mmc_host *host)
>>>
>>> explicit_inv_cd = of_property_read_bool(np, "cd-inverted");
>>>
>>> - if (of_find_property(np, "broken-cd", &len))
>>> - host->caps |= MMC_CAP_NEEDS_POLL;
>>> -
>>> gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags);
>>> if (gpio == -EPROBE_DEFER)
>>> return gpio;
>>> --
>>> 1.7.9.5
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>
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