| Message ID | 7ab490e5b311f6cb057c4663d69ef7cbe3318dae.1563266066.git.baolin.wang@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v3] mmc: host: sdhci-sprd: Fix the incorrect soft reset operation when runtime resuming | expand |
On 16/07/19 11:39 AM, Baolin Wang wrote: > In sdhci_runtime_resume_host() function, we will always do software reset > for all, which will cause Spreadtrum host controller work abnormally after > resuming. > > Thus for Spreadtrum platform that do not power down the SD/eMMC card during > runtime suspend, we should not do software reset for all. To fix this > issue, adding a specific reset operation that add one condition to validate > the MMC_CAP_AGGRESSIVE_PM to decide if we can do software reset for all or > just reset command and data lines. > > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > --- > Changes from v2: > - Simplify the sdhci_sprd_reset() by issuing sdhci_reset(). > > Changes from v1: > - Add a specific reset operation instead of changing the core to avoid > affecting other hardware. > --- > drivers/mmc/host/sdhci-sprd.c | 19 ++++++++++++++++++- > 1 file changed, 18 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c > index 603a5d9..bc9393c 100644 > --- a/drivers/mmc/host/sdhci-sprd.c > +++ b/drivers/mmc/host/sdhci-sprd.c > @@ -373,6 +373,23 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) > return 1 << 31; > } > > +static void sdhci_sprd_reset(struct sdhci_host *host, u8 mask) > +{ > + struct mmc_host *mmc = host->mmc; > + > + /* > + * When try to reset controller after runtime suspend, we should not > + * reset for all if the SD/eMMC card is not power down, just reset > + * command and data lines instead. Otherwise will meet some strange > + * behaviors for Spreadtrum host controller. > + */ > + if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) && > + !(mmc->caps & MMC_CAP_AGGRESSIVE_PM)) MMC_CAP_AGGRESSIVE_PM does not necessarily mean that the card will have been runtime suspended. What about checking if the card power is on? i.e. if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) && mmc->ios.power_mode == MMC_POWER_ON) > + mask = SDHCI_RESET_CMD | SDHCI_RESET_DATA; > + > + sdhci_reset(host, mask); > +} > + > static struct sdhci_ops sdhci_sprd_ops = { > .read_l = sdhci_sprd_readl, > .write_l = sdhci_sprd_writel, > @@ -381,7 +398,7 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) > .get_max_clock = sdhci_sprd_get_max_clock, > .get_min_clock = sdhci_sprd_get_min_clock, > .set_bus_width = sdhci_set_bus_width, > - .reset = sdhci_reset, > + .reset = sdhci_sprd_reset, > .set_uhs_signaling = sdhci_sprd_set_uhs_signaling, > .hw_reset = sdhci_sprd_hw_reset, > .get_max_timeout_count = sdhci_sprd_get_max_timeout_count, >
On Tue, 16 Jul 2019 at 18:40, Adrian Hunter <adrian.hunter@intel.com> wrote: > > On 16/07/19 11:39 AM, Baolin Wang wrote: > > In sdhci_runtime_resume_host() function, we will always do software reset > > for all, which will cause Spreadtrum host controller work abnormally after > > resuming. > > > > Thus for Spreadtrum platform that do not power down the SD/eMMC card during > > runtime suspend, we should not do software reset for all. To fix this > > issue, adding a specific reset operation that add one condition to validate > > the MMC_CAP_AGGRESSIVE_PM to decide if we can do software reset for all or > > just reset command and data lines. > > > > Signed-off-by: Baolin Wang <baolin.wang@linaro.org> > > --- > > Changes from v2: > > - Simplify the sdhci_sprd_reset() by issuing sdhci_reset(). > > > > Changes from v1: > > - Add a specific reset operation instead of changing the core to avoid > > affecting other hardware. > > --- > > drivers/mmc/host/sdhci-sprd.c | 19 ++++++++++++++++++- > > 1 file changed, 18 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c > > index 603a5d9..bc9393c 100644 > > --- a/drivers/mmc/host/sdhci-sprd.c > > +++ b/drivers/mmc/host/sdhci-sprd.c > > @@ -373,6 +373,23 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) > > return 1 << 31; > > } > > > > +static void sdhci_sprd_reset(struct sdhci_host *host, u8 mask) > > +{ > > + struct mmc_host *mmc = host->mmc; > > + > > + /* > > + * When try to reset controller after runtime suspend, we should not > > + * reset for all if the SD/eMMC card is not power down, just reset > > + * command and data lines instead. Otherwise will meet some strange > > + * behaviors for Spreadtrum host controller. > > + */ > > + if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) && > > + !(mmc->caps & MMC_CAP_AGGRESSIVE_PM)) > > MMC_CAP_AGGRESSIVE_PM does not necessarily mean that the card will have been > runtime suspended. > > What about checking if the card power is on? i.e. Yes, you are totally correct. I'll fix this in next version. Thanks for your comments. > if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) && > mmc->ios.power_mode == MMC_POWER_ON) > > > + mask = SDHCI_RESET_CMD | SDHCI_RESET_DATA; > > + > > + sdhci_reset(host, mask); > > +} > > + > > static struct sdhci_ops sdhci_sprd_ops = { > > .read_l = sdhci_sprd_readl, > > .write_l = sdhci_sprd_writel, > > @@ -381,7 +398,7 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) > > .get_max_clock = sdhci_sprd_get_max_clock, > > .get_min_clock = sdhci_sprd_get_min_clock, > > .set_bus_width = sdhci_set_bus_width, > > - .reset = sdhci_reset, > > + .reset = sdhci_sprd_reset, > > .set_uhs_signaling = sdhci_sprd_set_uhs_signaling, > > .hw_reset = sdhci_sprd_hw_reset, > > .get_max_timeout_count = sdhci_sprd_get_max_timeout_count, > > > -- Baolin Wang Best Regards
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index 603a5d9..bc9393c 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -373,6 +373,23 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) return 1 << 31; } +static void sdhci_sprd_reset(struct sdhci_host *host, u8 mask) +{ + struct mmc_host *mmc = host->mmc; + + /* + * When try to reset controller after runtime suspend, we should not + * reset for all if the SD/eMMC card is not power down, just reset + * command and data lines instead. Otherwise will meet some strange + * behaviors for Spreadtrum host controller. + */ + if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) && + !(mmc->caps & MMC_CAP_AGGRESSIVE_PM)) + mask = SDHCI_RESET_CMD | SDHCI_RESET_DATA; + + sdhci_reset(host, mask); +} + static struct sdhci_ops sdhci_sprd_ops = { .read_l = sdhci_sprd_readl, .write_l = sdhci_sprd_writel, @@ -381,7 +398,7 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host) .get_max_clock = sdhci_sprd_get_max_clock, .get_min_clock = sdhci_sprd_get_min_clock, .set_bus_width = sdhci_set_bus_width, - .reset = sdhci_reset, + .reset = sdhci_sprd_reset, .set_uhs_signaling = sdhci_sprd_set_uhs_signaling, .hw_reset = sdhci_sprd_hw_reset, .get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
In sdhci_runtime_resume_host() function, we will always do software reset for all, which will cause Spreadtrum host controller work abnormally after resuming. Thus for Spreadtrum platform that do not power down the SD/eMMC card during runtime suspend, we should not do software reset for all. To fix this issue, adding a specific reset operation that add one condition to validate the MMC_CAP_AGGRESSIVE_PM to decide if we can do software reset for all or just reset command and data lines. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- Changes from v2: - Simplify the sdhci_sprd_reset() by issuing sdhci_reset(). Changes from v1: - Add a specific reset operation instead of changing the core to avoid affecting other hardware. --- drivers/mmc/host/sdhci-sprd.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) -- 1.7.9.5