On 20/08/19 5:06 AM, Ben Chuang wrote: > From: Ben Chuang <[email protected]> > > 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: Ben Chuang <[email protected]> > Co-developed-by: Michael K Johnson <[email protected]> > Signed-off-by: Michael K Johnson <[email protected]>
Acked-by: Adrian Hunter <[email protected]> > --- > drivers/mmc/host/sdhci.c | 23 +++++++++++++++++++++++ > drivers/mmc/host/sdhci.h | 1 + > 2 files changed, 24 insertions(+) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index bed0760a6c2a..9106ebc7a422 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -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); > } > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index 199712e7adbb..72601a4d2e95 100644 > --- a/drivers/mmc/host/sdhci.h > +++ b/drivers/mmc/host/sdhci.h > @@ -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 > >
