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mmc: sdhci: add quirk SDHCI_QUIRK_CLOCK_DIV_ZERO_BROKEN 

adds quirk for controllers whose clock divider zero is broken,
sdhci_set_clock function will incorporate this modification.

Signed-off-by: Suneel Garapati <suneel.garapati@xilinx.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Suneel Garapati 2015-06-09 13:01:50 +05:30 committed by Ulf Hansson
parent 6464b71409
commit d1955c3a9a
2 changed files with 5 additions and 0 deletions
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3
drivers/mmc/host/sdhci.c
View File

@ -1210,6 +1210,9 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
}
real_div = div;
div >>= 1;
if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
&& !div && host->max_clk <= 25000000)
div = 1;
}
} else {
/* Version 2.00 divisors must be a power of 2. */

2
drivers/mmc/host/sdhci.h
View File

@ -409,6 +409,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_SUPPORT_SINGLE (1<<13)
/* Controller broken with using ACMD23 */
#define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14)
/* Broken Clock divider zero in controller */
#define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (1<<15)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */