| Message ID | 1483601012-18241-1-git-send-email-xzy.xu@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2017/1/5 15:23, Ziyuan Xu wrote: > It's necessary to setup bus if any slots are present. > - update clock after ctrl reset > - if the host has genpd node, we can guarantee the clock is available > before starting request. Otherwies, the clock register is reset once > power off the pd, and host can't output the active clock during > communication. > > fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") > Reported-by: Randy Li <randy.li@rock-chips.com> > Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> > > --- > Hi guys, > > I found a similar issue on rk3399 platform, which has a genpd node for > SD card host. Power off-on pd will reset the registers to a default > value (ie. CLKENA), so that the host can't output the active clock > during communication. > Indeed, Caesar recently introduced all the genpd for rk3399 platform, so we need to restore them. > So we need to setup bus in rpm resume. It also wraps the update clock > behaviour which I did in V3. > > Thanks, > Ziyuan Xu > > > Changes in v4: > - update commit message > - fix SD host rpm resume can't work > > Changes in v3: > - only reset host with active slot. > > Changes in v2: > - update the commit message > - use dw_mci_reset instead of dw_mci_ctrl_reset > > drivers/mmc/host/dw_mmc.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index b44306b..b6053b3 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -3354,10 +3354,10 @@ int dw_mci_runtime_resume(struct device *dev) > > if (!slot) > continue; > - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { > + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) > dw_mci_set_ios(slot->mmc, &slot->mmc->ios); > - dw_mci_setup_bus(slot, true); > - } > + /* Force setup bus to guarantee available clock output */ > + dw_mci_setup_bus(slot, true); So the spamming message about "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n" will always be there, right? So you could append a new patch to shut up it as I think it's useless no matter for system pm or rpm to print it. How about? > } > > /* Now that slots are all setup, we can enable card detect */ >
On 01/05/2017 03:34 PM, Shawn Lin wrote: > On 2017/1/5 15:23, Ziyuan Xu wrote: >> It's necessary to setup bus if any slots are present. >> - update clock after ctrl reset >> - if the host has genpd node, we can guarantee the clock is available >> before starting request. Otherwies, the clock register is reset once >> power off the pd, and host can't output the active clock during >> communication. >> >> fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") >> Reported-by: Randy Li <randy.li@rock-chips.com> >> Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> >> >> --- >> Hi guys, >> >> I found a similar issue on rk3399 platform, which has a genpd node for >> SD card host. Power off-on pd will reset the registers to a default >> value (ie. CLKENA), so that the host can't output the active clock >> during communication. >> > > Indeed, Caesar recently introduced all the genpd for rk3399 platform, > so we need to restore them. > >> So we need to setup bus in rpm resume. It also wraps the update clock >> behaviour which I did in V3. >> >> Thanks, >> Ziyuan Xu >> >> >> Changes in v4: >> - update commit message >> - fix SD host rpm resume can't work >> >> Changes in v3: >> - only reset host with active slot. >> >> Changes in v2: >> - update the commit message >> - use dw_mci_reset instead of dw_mci_ctrl_reset >> >> drivers/mmc/host/dw_mmc.c | 6 +++--- >> 1 file changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >> index b44306b..b6053b3 100644 >> --- a/drivers/mmc/host/dw_mmc.c >> +++ b/drivers/mmc/host/dw_mmc.c >> @@ -3354,10 +3354,10 @@ int dw_mci_runtime_resume(struct device *dev) >> >> if (!slot) >> continue; >> - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { >> + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) >> dw_mci_set_ios(slot->mmc, &slot->mmc->ios); >> - dw_mci_setup_bus(slot, true); >> - } >> + /* Force setup bus to guarantee available clock output */ >> + dw_mci_setup_bus(slot, true); > > So the spamming message about > > "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n" > > will always be there, right? So you could append a new patch to shut > up it as I think it's useless no matter for system pm or rpm to print > it. How about? Fine, it's favourable with dev_vdbg if the dw_mmc rpm is enabled. Hi Jaehoon, What's your opinion? If you think this patch and shawn's advice are acceptable, I will send the v5 patch. BR Ziyuan Xu > >> } >> >> /* Now that slots are all setup, we can enable card detect */ >> > > -- 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 01/09/2017 12:39 PM, Ziyuan wrote: > > > On 01/05/2017 03:34 PM, Shawn Lin wrote: >> On 2017/1/5 15:23, Ziyuan Xu wrote: >>> It's necessary to setup bus if any slots are present. >>> - update clock after ctrl reset >>> - if the host has genpd node, we can guarantee the clock is available >>> before starting request. Otherwies, the clock register is reset once >>> power off the pd, and host can't output the active clock during >>> communication. >>> >>> fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") >>> Reported-by: Randy Li <randy.li@rock-chips.com> >>> Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> >>> >>> --- >>> Hi guys, >>> >>> I found a similar issue on rk3399 platform, which has a genpd node for >>> SD card host. Power off-on pd will reset the registers to a default >>> value (ie. CLKENA), so that the host can't output the active clock >>> during communication. >>> >> >> Indeed, Caesar recently introduced all the genpd for rk3399 platform, >> so we need to restore them. >> >>> So we need to setup bus in rpm resume. It also wraps the update clock >>> behaviour which I did in V3. >>> >>> Thanks, >>> Ziyuan Xu >>> >>> >>> Changes in v4: >>> - update commit message >>> - fix SD host rpm resume can't work >>> >>> Changes in v3: >>> - only reset host with active slot. >>> >>> Changes in v2: >>> - update the commit message >>> - use dw_mci_reset instead of dw_mci_ctrl_reset >>> >>> drivers/mmc/host/dw_mmc.c | 6 +++--- >>> 1 file changed, 3 insertions(+), 3 deletions(-) >>> >>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>> index b44306b..b6053b3 100644 >>> --- a/drivers/mmc/host/dw_mmc.c >>> +++ b/drivers/mmc/host/dw_mmc.c >>> @@ -3354,10 +3354,10 @@ int dw_mci_runtime_resume(struct device *dev) >>> >>> if (!slot) >>> continue; >>> - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { >>> + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) >>> dw_mci_set_ios(slot->mmc, &slot->mmc->ios); >>> - dw_mci_setup_bus(slot, true); >>> - } >>> + /* Force setup bus to guarantee available clock output */ >>> + dw_mci_setup_bus(slot, true); >> >> So the spamming message about >> >> "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n" >> >> will always be there, right? So you could append a new patch to shut >> up it as I think it's useless no matter for system pm or rpm to print >> it. How about? > > Fine, it's favourable with dev_vdbg if the dw_mmc rpm is enabled. > Hi Jaehoon, > What's your opinion? If you think this patch and shawn's advice are acceptable, I will send the v5 patch. I don't agreed to use dev_vdbg()..but it needs not to display at everytime. Hmm..It needs to consider more..because we needs to see the clock value when it's initialized. Best Regards, Jaehoon Chung > > BR > Ziyuan Xu > >> >>> } >>> >>> /* Now that slots are all setup, we can enable card detect */ >>> >> >> > > > > > -- 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 2017/1/9 13:41, Jaehoon Chung wrote: > On 01/09/2017 12:39 PM, Ziyuan wrote: >> >> >> On 01/05/2017 03:34 PM, Shawn Lin wrote: >>> On 2017/1/5 15:23, Ziyuan Xu wrote: >>>> It's necessary to setup bus if any slots are present. >>>> - update clock after ctrl reset >>>> - if the host has genpd node, we can guarantee the clock is available >>>> before starting request. Otherwies, the clock register is reset once >>>> power off the pd, and host can't output the active clock during >>>> communication. >>>> >>>> fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") >>>> Reported-by: Randy Li <randy.li@rock-chips.com> >>>> Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> >>>> >>>> --- >>>> Hi guys, >>>> >>>> I found a similar issue on rk3399 platform, which has a genpd node for >>>> SD card host. Power off-on pd will reset the registers to a default >>>> value (ie. CLKENA), so that the host can't output the active clock >>>> during communication. >>>> >>> >>> Indeed, Caesar recently introduced all the genpd for rk3399 platform, >>> so we need to restore them. >>> >>>> So we need to setup bus in rpm resume. It also wraps the update clock >>>> behaviour which I did in V3. >>>> >>>> Thanks, >>>> Ziyuan Xu >>>> >>>> >>>> Changes in v4: >>>> - update commit message >>>> - fix SD host rpm resume can't work >>>> >>>> Changes in v3: >>>> - only reset host with active slot. >>>> >>>> Changes in v2: >>>> - update the commit message >>>> - use dw_mci_reset instead of dw_mci_ctrl_reset >>>> >>>> drivers/mmc/host/dw_mmc.c | 6 +++--- >>>> 1 file changed, 3 insertions(+), 3 deletions(-) >>>> >>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>> index b44306b..b6053b3 100644 >>>> --- a/drivers/mmc/host/dw_mmc.c >>>> +++ b/drivers/mmc/host/dw_mmc.c >>>> @@ -3354,10 +3354,10 @@ int dw_mci_runtime_resume(struct device *dev) >>>> >>>> if (!slot) >>>> continue; >>>> - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { >>>> + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) >>>> dw_mci_set_ios(slot->mmc, &slot->mmc->ios); >>>> - dw_mci_setup_bus(slot, true); >>>> - } >>>> + /* Force setup bus to guarantee available clock output */ >>>> + dw_mci_setup_bus(slot, true); >>> >>> So the spamming message about >>> >>> "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n" >>> >>> will always be there, right? So you could append a new patch to shut >>> up it as I think it's useless no matter for system pm or rpm to print >>> it. How about? >> >> Fine, it's favourable with dev_vdbg if the dw_mmc rpm is enabled. >> Hi Jaehoon, >> What's your opinion? If you think this patch and shawn's advice are acceptable, I will send the v5 patch. > > I don't agreed to use dev_vdbg()..but it needs not to display at everytime. > Hmm..It needs to consider more..because we needs to see the clock value when it's initialized. > A very stright-forward way is to pass a flag to shut up the spamming log when it's called from the PM context? > Best Regards, > Jaehoon Chung > >> >> BR >> Ziyuan Xu >> >>> >>>> } >>>> >>>> /* Now that slots are all setup, we can enable card detect */ >>>> >>> >>> >> >> >> >> >> > > > >
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index b44306b..b6053b3 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3354,10 +3354,10 @@ int dw_mci_runtime_resume(struct device *dev) if (!slot) continue; - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) dw_mci_set_ios(slot->mmc, &slot->mmc->ios); - dw_mci_setup_bus(slot, true); - } + /* Force setup bus to guarantee available clock output */ + dw_mci_setup_bus(slot, true); } /* Now that slots are all setup, we can enable card detect */
It's necessary to setup bus if any slots are present. - update clock after ctrl reset - if the host has genpd node, we can guarantee the clock is available before starting request. Otherwies, the clock register is reset once power off the pd, and host can't output the active clock during communication. fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") Reported-by: Randy Li <randy.li@rock-chips.com> Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> --- Hi guys, I found a similar issue on rk3399 platform, which has a genpd node for SD card host. Power off-on pd will reset the registers to a default value (ie. CLKENA), so that the host can't output the active clock during communication. So we need to setup bus in rpm resume. It also wraps the update clock behaviour which I did in V3. Thanks, Ziyuan Xu Changes in v4: - update commit message - fix SD host rpm resume can't work Changes in v3: - only reset host with active slot. Changes in v2: - update the commit message - use dw_mci_reset instead of dw_mci_ctrl_reset drivers/mmc/host/dw_mmc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)