diff options
| author | Arnd Hannemann <arnd@arndnet.de> | 2010-08-24 17:27:01 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-10-29 00:29:13 +0200 |
| commit | 777271d0f33da306575ef776c75f66fc27246bf0 (patch) | |
| tree | 24ee153012443783166946cac260c6ccc67de1b2 | |
| parent | 998283e2e359249133f2f47db26669a55ff25c98 (diff) | |
mmc: Allow the platform to specify the sh_mmcif get_cd handler
In some platforms (e.g. AP4EVB) the card detect pin of a slot is not
directly connected to the sh_mmcif controller, so that polling needs
to be used. To overcome the overhead induced by querying the controller
on each poll cycle, card detection can be handled in the platform code
more efficiently.
This patch exposes a get_cd hook for that purpose.
Signed-off-by: Arnd Hannemann <arnd@arndnet.de>
Tested-by: Yusuke Goda <yusuke.goda.sx@renesas.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
| -rw-r--r-- | drivers/mmc/host/sh_mmcif.c | 12 | ||||
| -rw-r--r-- | include/linux/mmc/sh_mmcif.h | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c index 0f06b800281..ddd09840520 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -710,9 +710,21 @@ static void sh_mmcif_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) host->bus_width = ios->bus_width; } +static int sh_mmcif_get_cd(struct mmc_host *mmc) +{ + struct sh_mmcif_host *host = mmc_priv(mmc); + struct sh_mmcif_plat_data *p = host->pd->dev.platform_data; + + if (!p->get_cd) + return -ENOSYS; + else + return p->get_cd(host->pd); +} + static struct mmc_host_ops sh_mmcif_ops = { .request = sh_mmcif_request, .set_ios = sh_mmcif_set_ios, + .get_cd = sh_mmcif_get_cd, }; static void sh_mmcif_detect(struct mmc_host *mmc) diff --git a/include/linux/mmc/sh_mmcif.h b/include/linux/mmc/sh_mmcif.h index d4a2ebbdab4..d19e2114fd8 100644 --- a/include/linux/mmc/sh_mmcif.h +++ b/include/linux/mmc/sh_mmcif.h @@ -34,6 +34,7 @@ struct sh_mmcif_plat_data { void (*set_pwr)(struct platform_device *pdev, int state); void (*down_pwr)(struct platform_device *pdev); + int (*get_cd)(struct platform_device *pdef); u8 sup_pclk; /* 1 :SH7757, 0: SH7724/SH7372 */ unsigned long caps; u32 ocr; |