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sdhci-of: avoid writing reserved bits into host control register

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SDHCI core tries to write HISPD bit into the host control register, but
the eSDHC controllers don't have that bit, and that causes all sorts of
misbehaviour when using 4-bit mode capable SD cards.

Signed-off-by: Anton Vorontsov <[email protected]>
Cc: Pierre Ossman <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: David Vrabel <[email protected]>
Cc: Ben Dooks <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Anton Vorontsov 2009-09-22 16:45:11 -07:00 • committed by Linus Torvalds
commit c085926985
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/host/sdhci-of.c
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@ -48,6 +48,8 @@ struct sdhci_of_host {
#define ESDHC_CLOCK_HCKEN 0x00000002
#define ESDHC_CLOCK_IPGEN 0x00000001
#define ESDHC_HOST_CONTROL_RES 0x05
static u32 esdhc_readl(struct sdhci_host *host, int reg)
{
return in_be32(host->ioaddr + reg);
@ -109,6 +111,10 @@ static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
int base = reg & ~0x3;
int shift = (reg & 0x3) * 8;
/* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
if (reg == SDHCI_HOST_CONTROL)
val &= ~ESDHC_HOST_CONTROL_RES;
clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
}