| Message ID | 20171120183451.18966-1-bjorn.andersson@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 11/20, Bjorn Andersson wrote: > Not all instances of the SDCC core supports changing signal voltage and > as such will not generate a power interrupt when the software attempts > to change the voltage. This results in probing the eMMC on some devices > to take over 2 minutes. > > Check that the SWITCHABLE_SIGNAL_VOLTAGE bit in MCI_GENERICS is set T in SWITCHABLE_SIGNAL_VOLTAGE here. > before waiting for the power interrupt. > > Cc: Sahitya Tummala <stummala@codeaurora.org> > Cc: Vijay Viswanath <vviswana@codeaurora.org> > Fixes: c0309b3803fe ("mmc: sdhci-msm: Add sdhci msm register write APIs which wait for pwr irq") > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> > --- > > The offending patch is part of your v4.15 pull request, so please pick > this up for the -rcs. > > drivers/mmc/host/sdhci-msm.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > index 3fb7d2eec93f..8f2dda73e6b4 100644 > --- a/drivers/mmc/host/sdhci-msm.c > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -29,6 +29,9 @@ > #define CORE_VERSION_MAJOR_MASK (0xf << CORE_VERSION_MAJOR_SHIFT) > #define CORE_VERSION_MINOR_MASK 0xff > > +#define CORE_MCI_GENERICS 0x70 > +#define SWICHABLE_SIGNALING_VOLTAGE BIT(29) But then the T isn't here.
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 3fb7d2eec93f..8f2dda73e6b4 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -29,6 +29,9 @@ #define CORE_VERSION_MAJOR_MASK (0xf << CORE_VERSION_MAJOR_SHIFT) #define CORE_VERSION_MINOR_MASK 0xff +#define CORE_MCI_GENERICS 0x70 +#define SWICHABLE_SIGNALING_VOLTAGE BIT(29) + #define CORE_HC_MODE 0x78 #define HC_MODE_EN 0x1 #define CORE_POWER 0x0 @@ -1028,11 +1031,22 @@ static void sdhci_msm_check_power_status(struct sdhci_host *host, u32 req_type) struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); bool done = false; + u32 val; pr_debug("%s: %s: request %d curr_pwr_state %x curr_io_level %x\n", mmc_hostname(host->mmc), __func__, req_type, msm_host->curr_pwr_state, msm_host->curr_io_level); + /* + * The power interrupt will not be generated for signal voltage + * switches if SWICHABLE_SIGNALING_VOLTAGE in MCI_GENERICS is not set + */ + val = readl(msm_host->core_mem + CORE_MCI_GENERICS); + if ((req_type & REQ_IO_HIGH || req_type & REQ_IO_LOW) && + !(val & SWICHABLE_SIGNALING_VOLTAGE)) { + return; + } + /* * The IRQ for request type IO High/LOW will be generated when - * there is a state change in 1.8V enable bit (bit 3) of
Not all instances of the SDCC core supports changing signal voltage and as such will not generate a power interrupt when the software attempts to change the voltage. This results in probing the eMMC on some devices to take over 2 minutes. Check that the SWITCHABLE_SIGNAL_VOLTAGE bit in MCI_GENERICS is set before waiting for the power interrupt. Cc: Sahitya Tummala <stummala@codeaurora.org> Cc: Vijay Viswanath <vviswana@codeaurora.org> Fixes: c0309b3803fe ("mmc: sdhci-msm: Add sdhci msm register write APIs which wait for pwr irq") Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> --- The offending patch is part of your v4.15 pull request, so please pick this up for the -rcs. drivers/mmc/host/sdhci-msm.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)