[v2,1/3] mmc: sdhci: let GPIO based card detection have higher precedence

Message ID 1436184981-16719-2-git-send-email-ivan.ivanov@linaro.org
State New
Headers show

Commit Message

Ivan T. Ivanov July 6, 2015, 12:16 p.m.
Controller could have BROKEN_CARD_DETECTION quirk set, but drivers
could use GPIO to detect card present state. Let, when defined, GPIO
take precedence, so drivers could properly detect card state and not
use polling.

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
---
 drivers/mmc/host/sdhci.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--
1.9.1

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Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index bc14452..dd91b24 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1601,15 +1601,21 @@  static int sdhci_do_get_cd(struct sdhci_host *host)
 	if (host->flags & SDHCI_DEVICE_DEAD)
 		return 0;

-	/* If polling/nonremovable, assume that the card is always present. */
-	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
-	    (host->mmc->caps & MMC_CAP_NONREMOVABLE))
+	/* If nonremovable, assume that the card is always present. */
+	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 		return 1;

-	/* Try slot gpio detect */
+	/*
+	 * Try slot gpio detect, if defined it take precedence
+	 * over build in controller functionality
+	 */
 	if (!IS_ERR_VALUE(gpio_cd))
 		return !!gpio_cd;

+	/* If polling, assume that the card is always present. */
+	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
+		return 1;
+
 	/* Host native card detect */
 	return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
 }