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authorTakashi Iwai <tiwai@suse.de>2011-04-21 22:26:38 +0400
committerChris Ball <cjb@laptop.org>2011-05-25 05:02:42 +0400
commit82b0e23a295cc58d1290017ee97a40956ad68d94 (patch)
treef3f140be979623ae8b83b79841eb842858ed054b /include/linux/mmc/sdhci.h
parentf06c9153f5ecd47dfed23f87b9d08e42ff0e4170 (diff)
downloadlinux-82b0e23a295cc58d1290017ee97a40956ad68d94.tar.xz
mmc: sdhci: Fix read-only detection with JMicron 388 chip
On HP laptops with JMicron 388 chip, the write-locked SD card isn't detected correctly as read-only in many cases. This is because the PRESENT_STATE register becomes unsable just after plugging, and it returns the WRITE_PROTECT bit wrongly at the first read. This patch fixes the read-only detection by adding a new sdhci quirk indicating to check the register more intensively with a relatively long delay. The patch is tested with 2.6.39-rc4 kernel. Cc: Aries Lee <arieslee@jmicron.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'include/linux/mmc/sdhci.h')
-rw-r--r--include/linux/mmc/sdhci.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 83bd9f76709a..92e1c9ad126c 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -85,6 +85,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_NO_HISPD_BIT (1<<29)
/* Controller treats ADMA descriptors with length 0000h incorrectly */
#define SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC (1<<30)
+/* The read-only detection via SDHCI_PRESENT_STATE register is unstable */
+#define SDHCI_QUIRK_UNSTABLE_RO_DETECT (1<<31)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */