Commit 1beabbdb authored by Ben Chuang's avatar Ben Chuang Committed by Ulf Hansson
Browse files

mmc: sdhci: Add PLL Enable support to internal clock setup



The GL9750 and GL9755 chipsets, and possibly others, require PLL Enable
setup as part of the internal clock setup as described in 3.2.1 Internal
Clock Setup Sequence of SD Host Controller Simplified Specification
Version 4.20.

Signed-off-by: default avatarBen Chuang <ben.chuang@genesyslogic.com.tw>
Co-developed-by: default avatarMichael K Johnson <johnsonm@danlj.org>
Signed-off-by: default avatarMichael K Johnson <johnsonm@danlj.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 4a9e0d1a
......@@ -1653,6 +1653,29 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
udelay(10);
}
if (host->version >= SDHCI_SPEC_410 && host->v4_mode) {
clk |= SDHCI_CLOCK_PLL_EN;
clk &= ~SDHCI_CLOCK_INT_STABLE;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
/* Wait max 150 ms */
timeout = ktime_add_ms(ktime_get(), 150);
while (1) {
bool timedout = ktime_after(ktime_get(), timeout);
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
if (clk & SDHCI_CLOCK_INT_STABLE)
break;
if (timedout) {
pr_err("%s: PLL clock never stabilised.\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
return;
}
udelay(10);
}
}
clk |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}
......
......@@ -114,6 +114,7 @@
#define SDHCI_DIV_HI_MASK 0x300
#define SDHCI_PROG_CLOCK_MODE 0x0020
#define SDHCI_CLOCK_CARD_EN 0x0004
#define SDHCI_CLOCK_PLL_EN 0x0008
#define SDHCI_CLOCK_INT_STABLE 0x0002
#define SDHCI_CLOCK_INT_EN 0x0001
......
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