linux-kernel - [PATCH v1 1/6] mmc: sdhci: Introduce couple of quirks to ignore particular state of CD GPIO

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Date:   Tue,  5 Oct 2021 13:24:25 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Raul E Rangel <rrangel@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: [PATCH v1 1/6] mmc: sdhci: Introduce couple of quirks to ignore particular state of CD GPIO

Some platforms may provide contradictory info in some states of CD GPIO line,
and hence that state or states should be ignored. Introduce couple of quirks
for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/mmc/host/sdhci.c | 13 ++++++++-----
 drivers/mmc/host/sdhci.h |  4 ++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 357b365bf0ec..a7960ee3ef4f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2395,7 +2395,7 @@ EXPORT_SYMBOL_GPL(sdhci_set_ios);
 static int sdhci_get_cd(struct mmc_host *mmc)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
-	int gpio_cd = mmc_gpio_get_cd(mmc);
+	int gpio_cd;
 
 	if (host->flags & SDHCI_DEVICE_DEAD)
 		return 0;
@@ -2405,11 +2405,14 @@ static int sdhci_get_cd(struct mmc_host *mmc)
 		return 1;
 
 	/*
-	 * Try slot gpio detect, if defined it take precedence
-	 * over build in controller functionality
+	 * Try slot GPIO detect, if defined it take precedence
+	 * over build in controller functionality.
 	 */
-	if (gpio_cd >= 0)
-		return !!gpio_cd;
+	gpio_cd = mmc_gpio_get_cd(mmc);
+	if (gpio_cd == 0 && !(host->quirks2 & SDHCI_QUIRK_CARD_DETECTION_IF_GPIO_LOW))
+		return 0;
+	if (gpio_cd > 0 && !(host->quirks2 & SDHCI_QUIRK_CARD_DETECTION_IF_GPIO_HIGH))
+		return 1;
 
 	/* If polling, assume that the card is always present. */
 	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index e8d04e42a5af..fb7910d22b18 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -464,6 +464,10 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN		(1<<15)
 /* Controller has CRC in 136 bit Command Response */
 #define SDHCI_QUIRK2_RSP_136_HAS_CRC			(1<<16)
+/* Controller requires additional card detection test on GPIO low */
+#define SDHCI_QUIRK_CARD_DETECTION_IF_GPIO_LOW		(1<<17)
+/* Controller requires additional card detection test on GPIO high */
+#define SDHCI_QUIRK_CARD_DETECTION_IF_GPIO_HIGH		(1<<18)
 /*
  * Disable HW timeout if the requested timeout is more than the maximum
  * obtainable timeout.
-- 
2.33.0