Call mmc_gpio_get_cd() to query card presence from cd-gpio before
asking SDHCI. The rationale behind this change is that flag
SDHCI_QUIRK_BROKEN_CARD_DETECTION is designed for SDHCI controller to
tell that SDHCI_PRESENT_STATE is broken, and it should be used for this
case only. So when cd-gpio is being used, the controller should set
the flag to tell that SDHCI_PRESENT_STATE is not available.
However, the existing code will skip checking cd-gpio as long as flag
SDHCI_QUIRK_BROKEN_CARD_DETECTION is set. Change the querying order
between cd-gpio and SDHCI to support the rationale above.
Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 29 ++++++++++++++++-------------
1 file changed, 16 insertions(+), 13 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 0d2dbf8..037bd55 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1258,7 +1258,7 @@ static int sdhci_set_power(struct sdhci_host *host, unsigned short power)
static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct sdhci_host *host;
- bool present;
+ int present;
unsigned long flags;
u32 tuning_opcode;
@@ -1287,18 +1287,21 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
host->mrq = mrq;
- /* If polling, assume that the card is always present. */
- if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
- present = true;
- else
- present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
- SDHCI_CARD_PRESENT;
-
- /* If we're using a cd-gpio, testing the presence bit might fail. */
- if (!present) {
- int ret = mmc_gpio_get_cd(host->mmc);
- if (ret > 0)
- present = true;
+ /*
+ * Firstly check card presence from cd-gpio. The return could
+ * be one of the following possibilities:
+ * negative: cd-gpio is not available
+ * zero: cd-gpio is used, and card is removed
+ * one: cd-gpio is used, and card is present
+ */
+ present = mmc_gpio_get_cd(host->mmc);
+ if (present < 0) {
+ /* If polling, assume that the card is always present. */
+ if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
+ present = 1;
+ else
+ present = sdhci_readl(host, SDHCI_PRESENT_STATE) &
+ SDHCI_CARD_PRESENT;
}
if (!present || host->flags & SDHCI_DEVICE_DEAD) {
--
1.7.9.5
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