| Message ID | 1462326204-5090-1-git-send-email-shawn.lin@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 04/05/16 04:43, Shawn Lin wrote: > commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for > sdhci-of-arasan") introduce phy support for arasan. According to > the vendor's databook, we should make sure the phy is in poweroff > status before we configure the clk stuff. Otherwise it may cause > some IO sample timing issues from the test. And we don't need this > extra operation while running in low performance mode since phy > doesn't trigger sampling block. > > Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> > > --- > > Changes in v3: > - avoid use sleep function with the scope of spinlock because > phy APIs call mutex. > > Changes in v2: > - Rename commit msg title to indicate it's a fix > > drivers/mmc/host/sdhci-of-arasan.c | 26 +++++++++++++++++++++++++- > 1 file changed, 25 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c > index 2e482b1..b6f4c1d 100644 > --- a/drivers/mmc/host/sdhci-of-arasan.c > +++ b/drivers/mmc/host/sdhci-of-arasan.c > @@ -55,8 +55,32 @@ static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host) > return freq; > } > > +static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); > + bool ctrl_phy = false; > + > + if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy))) > + ctrl_phy = true; > + > + if (ctrl_phy) { > + spin_unlock_irq(&host->lock); > + phy_power_off(sdhci_arasan->phy); > + spin_lock_irq(&host->lock); > + } > + > + sdhci_set_clock(host, clock); > + > + if (ctrl_phy) { > + spin_unlock_irq(&host->lock); > + phy_power_on(sdhci_arasan->phy); > + spin_lock_irq(&host->lock); > + } > +} > + > static struct sdhci_ops sdhci_arasan_ops = { > - .set_clock = sdhci_set_clock, > + .set_clock = sdhci_arasan_set_clock, > .get_max_clock = sdhci_pltfm_clk_get_max_clock, > .get_timeout_clock = sdhci_arasan_get_timeout_clock, > .set_bus_width = sdhci_set_bus_width, > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 4 May 2016 at 03:43, Shawn Lin <shawn.lin@rock-chips.com> wrote: > commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for > sdhci-of-arasan") introduce phy support for arasan. According to > the vendor's databook, we should make sure the phy is in poweroff > status before we configure the clk stuff. Otherwise it may cause > some IO sample timing issues from the test. And we don't need this > extra operation while running in low performance mode since phy > doesn't trigger sampling block. > > Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Thanks, applied for next! Kind regards Uffe > > --- > > Changes in v3: > - avoid use sleep function with the scope of spinlock because > phy APIs call mutex. > > Changes in v2: > - Rename commit msg title to indicate it's a fix > > drivers/mmc/host/sdhci-of-arasan.c | 26 +++++++++++++++++++++++++- > 1 file changed, 25 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c > index 2e482b1..b6f4c1d 100644 > --- a/drivers/mmc/host/sdhci-of-arasan.c > +++ b/drivers/mmc/host/sdhci-of-arasan.c > @@ -55,8 +55,32 @@ static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host) > return freq; > } > > +static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); > + bool ctrl_phy = false; > + > + if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy))) > + ctrl_phy = true; > + > + if (ctrl_phy) { > + spin_unlock_irq(&host->lock); > + phy_power_off(sdhci_arasan->phy); > + spin_lock_irq(&host->lock); > + } > + > + sdhci_set_clock(host, clock); > + > + if (ctrl_phy) { > + spin_unlock_irq(&host->lock); > + phy_power_on(sdhci_arasan->phy); > + spin_lock_irq(&host->lock); > + } > +} > + > static struct sdhci_ops sdhci_arasan_ops = { > - .set_clock = sdhci_set_clock, > + .set_clock = sdhci_arasan_set_clock, > .get_max_clock = sdhci_pltfm_clk_get_max_clock, > .get_timeout_clock = sdhci_arasan_get_timeout_clock, > .set_bus_width = sdhci_set_bus_width, > -- > 2.3.7 > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c index 2e482b1..b6f4c1d 100644 --- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -55,8 +55,32 @@ static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host) return freq; } +static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); + bool ctrl_phy = false; + + if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy))) + ctrl_phy = true; + + if (ctrl_phy) { + spin_unlock_irq(&host->lock); + phy_power_off(sdhci_arasan->phy); + spin_lock_irq(&host->lock); + } + + sdhci_set_clock(host, clock); + + if (ctrl_phy) { + spin_unlock_irq(&host->lock); + phy_power_on(sdhci_arasan->phy); + spin_lock_irq(&host->lock); + } +} + static struct sdhci_ops sdhci_arasan_ops = { - .set_clock = sdhci_set_clock, + .set_clock = sdhci_arasan_set_clock, .get_max_clock = sdhci_pltfm_clk_get_max_clock, .get_timeout_clock = sdhci_arasan_get_timeout_clock, .set_bus_width = sdhci_set_bus_width,
commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for sdhci-of-arasan") introduce phy support for arasan. According to the vendor's databook, we should make sure the phy is in poweroff status before we configure the clk stuff. Otherwise it may cause some IO sample timing issues from the test. And we don't need this extra operation while running in low performance mode since phy doesn't trigger sampling block. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> --- Changes in v3: - avoid use sleep function with the scope of spinlock because phy APIs call mutex. Changes in v2: - Rename commit msg title to indicate it's a fix drivers/mmc/host/sdhci-of-arasan.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-)