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mmc: sdhci: Fix read-only detection with JMicron 388 chip

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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>
This commit is contained in:
Takashi Iwai
2011-04-21 20:26:38 +02:00
committed by Chris Ball
parent f06c9153f5
commit 82b0e23a29
3 changed files with 31 additions and 4 deletions
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5
drivers/mmc/host/sdhci-pci.c
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@@ -327,6 +327,11 @@ static int jmicron_probe(struct sdhci_pci_chip *chip)
return ret;
}
/* quirk for unsable RO-detection on JM388 chips */
if (chip->pdev->device == PCI_DEVICE_ID_JMICRON_JMB388_SD ||
chip->pdev->device == PCI_DEVICE_ID_JMICRON_JMB388_ESD)
chip->quirks |= SDHCI_QUIRK_UNSTABLE_RO_DETECT;
return 0;
}