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mmc: sdhci-esdhc-imx: fix strobe DLL lock wrong clock issue 

When enable DDR, the clock factor definition is changed.
e.g. original 200Mhz will become 100Mhz once MIX_CTRL_DDREN bit is set
So we need to update the clock setting then the strobe dll can lock
the correct clock rate.

Additionally we also need disable the clock before locking strobe dll.

Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Dong Aisheng 2016-07-12 15:46:20 +08:00 committed by Ulf Hansson
parent da0295ff1d
commit 7ac6da2623
1 changed files with 7 additions and 0 deletions
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7
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -853,6 +853,11 @@ static void esdhc_set_strobe_dll(struct sdhci_host *host)
u32 v;
if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) {
/* disable clock before enabling strobe dll */
writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
host->ioaddr + ESDHC_VENDOR_SPEC);
/* force a reset on strobe dll */
writel(ESDHC_STROBE_DLL_CTRL_RESET,
host->ioaddr + ESDHC_STROBE_DLL_CTRL);
@ -914,6 +919,8 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
imx_data->is_ddr = 1;
/* update clock after enable DDR for strobe DLL lock */
host->ops->set_clock(host, host->clock);
esdhc_set_strobe_dll(host);
break;
}