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mmc: Add support for JMicron 388 SD/MMC controller

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JMicron 388 SD/MMC combo controller supports the 1.8V low-voltage for
SD, but MMC doesn't work with the low-voltage, resulting in an error
at probing.

This patch adds the support for multiple voltage mask per device type,
so that SD works with 1.8V while MMC forces 3.3V.  Here new ocr_avail_*
fields for each device are introduced, so that the actual OCR mask is
switched dynamically.

Also, the restriction of low-voltage in core/sd.c is removed when the
bit is allowed explicitly via ocr_avail_sd mask.

This patch was rewritten from scratch based on Aries' original code.

Signed-off-by: Aries Lee <arieslee@jmicron.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Takashi Iwai 2010-12-08 10:04:30 +01:00 • committed by Chris Ball
parent 150ee73d1b
commit 8f230f454f
8 changed files with 76 additions and 12 deletions
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4
include/linux/mmc/sdhci.h
View file

@ -139,6 +139,10 @@ struct sdhci_host {
unsigned int caps; /* Alternative capabilities */
unsigned int ocr_avail_sdio; /* OCR bit masks */
unsigned int ocr_avail_sd;
unsigned int ocr_avail_mmc;
unsigned long private[0] ____cacheline_aligned;
};
#endif /* __SDHCI_H */