diff options
| author |   yangbo lu <yangbo.lu@nxp.com> | 2017-04-20 14:58:29 +0800 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2017-04-28 14:53:13 +0200 |
| commit | a627f025eb0534052ff451427c16750b3530634c (patch) | |
| tree | 60a8e75c77fff90b506ddebdfa72a36348d001a5 /drivers/mmc | |
| parent | mmc: sdhci-of-esdhc: poll ESDHC_CLOCK_STABLE bit with udelay (diff) | |
| download | linux-dev-a627f025eb0534052ff451427c16750b3530634c.tar.xz linux-dev-a627f025eb0534052ff451427c16750b3530634c.zip | |
mmc: sdhci-of-esdhc: limit SD clock for ls1012a/ls1046a
The ls1046a datasheet specified that the max SD clock frequency
for eSDHC SDR104/HS200 was 167MHz, and the ls1012a datasheet
specified it's 125MHz for ls1012a. So this patch is to add the
limitation.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-of-esdhc.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index 77dfc5915ddc..44b016baa585 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -457,6 +457,20 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock) if (esdhc->vendor_ver < VENDOR_V_23) pre_div = 2; + /* + * Limit SD clock to 167MHz for ls1046a according to its datasheet + */ + if (clock > 167000000 && + of_find_compatible_node(NULL, NULL, "fsl,ls1046a-esdhc")) + clock = 167000000; + + /* + * Limit SD clock to 125MHz for ls1012a according to its datasheet + */ + if (clock > 125000000 && + of_find_compatible_node(NULL, NULL, "fsl,ls1012a-esdhc")) + clock = 125000000; + /* Workaround to reduce the clock frequency for p1010 esdhc */ if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) { if (clock > 20000000) |