[RFC PATCH v1 1/1] mmc: zynq_sdhci: Only evaluate card-stable signal if card was detected

[lukas.funke-oss at weidmueller.com]

From: Lukas Funke <lukas.funke at weidmueller.com>

On ZynqMp there seems to be a dependency between the card-stable bit and
the card-detect bit. The card-stable bit is set *if and only if*
the card-detect bit was set before, indicating that the signal was
stable and reliable during card insertion.

If the card-detect bit is *not* evaluated the corresponding check leads
to a timeout indicating that the card-detect was not stable.

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
---

 drivers/mmc/zynq_sdhci.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c
index 935540d171..d0bccd41cc 100644
--- a/drivers/mmc/zynq_sdhci.c
+++ b/drivers/mmc/zynq_sdhci.c
@@ -1168,11 +1168,14 @@ static int arasan_sdhci_probe(struct udevice *dev)
 	 */
 	if (IS_ENABLED(CONFIG_ARCH_ZYNQMP) || IS_ENABLED(CONFIG_ARCH_VERSAL)) {
 		u32 timeout = 1000000;
+		u32 value;
 
-		while (((sdhci_readl(host, SDHCI_PRESENT_STATE) &
-			 SDHCI_CARD_STATE_STABLE) == 0) && timeout) {
+		value = sdhci_readl(host, SDHCI_PRESENT_STATE);
+		while ((value & SDHCI_CARD_PRESENT) &&
+		       ((value & SDHCI_CARD_STATE_STABLE) == 0) && timeout) {
 			udelay(1);
 			timeout--;
+			value = sdhci_readl(host, SDHCI_PRESENT_STATE);
 		}
 		if (!timeout) {
 			dev_err(dev, "Sdhci card detect state not stable\n");
-- 
2.30.2