Adrian Hunter wrote:
Matt Fleming wrote:
On Fri, Aug 27, 2010 at 08:05:13PM +0100, Chris Ball wrote:
Hi,
On Fri, Dec 04, 2009 at 03:55:09PM +0800, r66093@xxxxxxxxxxxxx wrote:
From: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
Add callback function to check if the card has been removed.
in order to check if the card has been removed, the function mmc_send_status will send commad CMD13 to card and ask the card to send its status register to driver, which will generate interrupt repeatly and make the system bad.
Therefore, get_cd callback is used to detect the card if the driver has.
Signed-off-by: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 5 ++++-
drivers/mmc/core/sd.c | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 06084db..c5c676d 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -494,7 +494,10 @@ static void mmc_detect(struct mmc_host *host)
/*
* Just check if our card has been removed.
*/
- err = mmc_send_status(host->card, NULL);
+ if (host->ops->get_cd)
+ err = !host->ops->get_cd(host);
+ else
+ err = mmc_send_status(host->card, NULL);
mmc_release_host(host);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index cd81c39..3cf1f38 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -548,7 +548,10 @@ static void mmc_sd_detect(struct mmc_host *host)
/*
* Just check if our card has been removed.
*/
- err = mmc_send_status(host->card, NULL);
+ if (host->ops->get_cd)
+ err = !host->ops->get_cd(host);
+ else
+ err = mmc_send_status(host->card, NULL);
mmc_release_host(host);
--
1.6.4
This patchset wasn't replied to -- any comments on it from the list?
I think this change makes sense, although it needs to be a bit smarter
with error handling because the get_cd() functions can return -ENOSYS if
they are not implemented (but the function pointer is still valid).
int err = 0;
if (host->ops->get_cd) {
err = host->ops->get_cd(host);
if (err >= 0)
err = !err;
}
if (!host->ops->get_cd || err < 0)
err = mmc_send_status(host->card, NULL);
Thoughts?
I am not sure it won't cause problems.
If you change the card then card detect will return true because
there is a card but send status will fail because the card is not
initialised. So the two do not seem equivalent.
But maybe the following?
int err = 0;
if (host->ops->get_cd)
err = !host->ops->get_cd(host);
if (!err)
err = mmc_send_status(host->card, NULL);
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