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Subject[PATCH v2 10/22] mmc: tmio: support IP-builtin card detection logic
Date
A card detect GPIO is set up only for platforms with "cd-gpios"
DT property or TMIO_MMC_USE_GPIO_CD flag. However, the driver
core always uses mmc_gpio_get_cd, which just fails with -ENOSYS
if ctx->cd_gpio is unset.

The bit 5 of the status register provides the current signal level
of the CD line. Allow to use it if the GPIO is unused.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2: None

drivers/mmc/host/tmio_mmc_core.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 610f26f..b51bb06 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -1087,6 +1087,19 @@ static int tmio_mmc_get_ro(struct mmc_host *mmc)
return ret;
}

+static int tmio_mmc_get_cd(struct mmc_host *mmc)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ int ret;
+
+ ret = mmc_gpio_get_cd(mmc);
+ if (ret >= 0)
+ return ret;
+
+ return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
+ TMIO_STAT_SIGSTATE);
+}
+
static int tmio_multi_io_quirk(struct mmc_card *card,
unsigned int direction, int blk_size)
{
@@ -1102,7 +1115,7 @@ static const struct mmc_host_ops tmio_mmc_ops = {
.request = tmio_mmc_request,
.set_ios = tmio_mmc_set_ios,
.get_ro = tmio_mmc_get_ro,
- .get_cd = mmc_gpio_get_cd,
+ .get_cd = tmio_mmc_get_cd,
.enable_sdio_irq = tmio_mmc_enable_sdio_irq,
.multi_io_quirk = tmio_multi_io_quirk,
.hw_reset = tmio_mmc_hw_reset,
--
2.7.4
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