* [PATCH] mmc: dw_mmc: add busmode selection support @ 2012-07-23 11:16 Girish K S 2012-07-24 11:09 ` Jaehoon Chung 0 siblings, 1 reply; 11+ messages in thread From: Girish K S @ 2012-07-23 11:16 UTC (permalink / raw) To: linux-mmc; +Cc: cjb, will.newton, patches, linux-samsung-soc, Girish K S Synopsis Designware host controller has suppport for open drain mode selection. During the mmc card initialization the host controller can select the open-drain bit to allow the device initialization in the open-drain mode. Once the device enters the standby mode this bit can be reset to enter push-pull mode. Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> --- drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ drivers/mmc/host/dw_mmc.h | 1 + 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 72dc3cd..da11e5a 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) spin_unlock_bh(&host->lock); } +static void dw_mci_set_busmode(struct dw_mci_slot *slot) +{ + struct mmc_ios *ios = &slot->mmc->ios; + u32 reg; + + reg = mci_readl(slot->host, CTRL); + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); + else + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); +} + static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct dw_mci_slot *slot = mmc_priv(mmc); @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) default: break; } + + dw_mci_set_busmode(slot); } static int dw_mci_get_ro(struct mmc_host *mmc) diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 15c27e1..1a53fb2 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -67,6 +67,7 @@ /* Control register defines */ #define SDMMC_CTRL_USE_IDMAC BIT(25) +#define SDMMC_CTRL_ENABLE_OD BIT(24) #define SDMMC_CTRL_CEATA_INT_EN BIT(11) #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) #define SDMMC_CTRL_SEND_CCSD BIT(9) -- 1.7.4.1 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-23 11:16 [PATCH] mmc: dw_mmc: add busmode selection support Girish K S @ 2012-07-24 11:09 ` Jaehoon Chung 2012-07-24 11:36 ` Girish K S 0 siblings, 1 reply; 11+ messages in thread From: Jaehoon Chung @ 2012-07-24 11:09 UTC (permalink / raw) To: Girish K S; +Cc: linux-mmc, cjb, will.newton, patches, linux-samsung-soc Hi Girish, Well..just tested on my board. this patch didn't work.(eMMC card didn't initialize) meaning of ios->bus_mode and synosys's bus_mode is same? How did you test this patch? Best Regards, Jaehoon Chung On 07/23/2012 08:16 PM, Girish K S wrote: > Synopsis Designware host controller has suppport for open > drain mode selection. During the mmc card initialization the > host controller can select the open-drain bit to allow the device > initialization in the open-drain mode. Once the device enters > the standby mode this bit can be reset to enter push-pull mode. > > Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> > --- > drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ > drivers/mmc/host/dw_mmc.h | 1 + > 2 files changed, 15 insertions(+), 0 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index 72dc3cd..da11e5a 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) > spin_unlock_bh(&host->lock); > } > > +static void dw_mci_set_busmode(struct dw_mci_slot *slot) > +{ > + struct mmc_ios *ios = &slot->mmc->ios; > + u32 reg; > + > + reg = mci_readl(slot->host, CTRL); > + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) > + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); > + else > + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); > +} > + > static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > { > struct dw_mci_slot *slot = mmc_priv(mmc); > @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > default: > break; > } > + > + dw_mci_set_busmode(slot); > } > > static int dw_mci_get_ro(struct mmc_host *mmc) > diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h > index 15c27e1..1a53fb2 100644 > --- a/drivers/mmc/host/dw_mmc.h > +++ b/drivers/mmc/host/dw_mmc.h > @@ -67,6 +67,7 @@ > > /* Control register defines */ > #define SDMMC_CTRL_USE_IDMAC BIT(25) > +#define SDMMC_CTRL_ENABLE_OD BIT(24) > #define SDMMC_CTRL_CEATA_INT_EN BIT(11) > #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) > #define SDMMC_CTRL_SEND_CCSD BIT(9) > ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 11:09 ` Jaehoon Chung @ 2012-07-24 11:36 ` Girish K S 2012-07-24 11:43 ` Girish K S 0 siblings, 1 reply; 11+ messages in thread From: Girish K S @ 2012-07-24 11:36 UTC (permalink / raw) To: Jaehoon Chung; +Cc: linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: > Hi Girish, > > Well..just tested on my board. > this patch didn't work.(eMMC card didn't initialize) > meaning of ios->bus_mode and synosys's bus_mode is same? > How did you test this patch? Tested it on exynos5 board using dt patches of thomas (with some modification to his patch) > > Best Regards, > Jaehoon Chung > > On 07/23/2012 08:16 PM, Girish K S wrote: >> Synopsis Designware host controller has suppport for open >> drain mode selection. During the mmc card initialization the >> host controller can select the open-drain bit to allow the device >> initialization in the open-drain mode. Once the device enters >> the standby mode this bit can be reset to enter push-pull mode. >> >> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >> --- >> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >> drivers/mmc/host/dw_mmc.h | 1 + >> 2 files changed, 15 insertions(+), 0 deletions(-) >> >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >> index 72dc3cd..da11e5a 100644 >> --- a/drivers/mmc/host/dw_mmc.c >> +++ b/drivers/mmc/host/dw_mmc.c >> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >> spin_unlock_bh(&host->lock); >> } >> >> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >> +{ >> + struct mmc_ios *ios = &slot->mmc->ios; >> + u32 reg; >> + >> + reg = mci_readl(slot->host, CTRL); >> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >> + else >> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >> +} >> + >> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >> { >> struct dw_mci_slot *slot = mmc_priv(mmc); >> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >> default: >> break; >> } >> + >> + dw_mci_set_busmode(slot); >> } >> >> static int dw_mci_get_ro(struct mmc_host *mmc) >> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >> index 15c27e1..1a53fb2 100644 >> --- a/drivers/mmc/host/dw_mmc.h >> +++ b/drivers/mmc/host/dw_mmc.h >> @@ -67,6 +67,7 @@ >> >> /* Control register defines */ >> #define SDMMC_CTRL_USE_IDMAC BIT(25) >> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >> #define SDMMC_CTRL_SEND_CCSD BIT(9) >> > > ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 11:36 ` Girish K S @ 2012-07-24 11:43 ` Girish K S 2012-07-24 13:07 ` Jae hoon Chung 0 siblings, 1 reply; 11+ messages in thread From: Girish K S @ 2012-07-24 11:43 UTC (permalink / raw) To: Jaehoon Chung; +Cc: linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: > On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >> Hi Girish, >> >> Well..just tested on my board. >> this patch didn't work.(eMMC card didn't initialize) >> meaning of ios->bus_mode and synosys's bus_mode is same? Yes it is same. synopsys spec says this is specific to MMC initialization. when the card core sets this mode during initialization. the host has to set this bit >> How did you test this patch? > Tested it on exynos5 board using dt patches of thomas (with some > modification to his patch) >> >> Best Regards, >> Jaehoon Chung >> >> On 07/23/2012 08:16 PM, Girish K S wrote: >>> Synopsis Designware host controller has suppport for open >>> drain mode selection. During the mmc card initialization the >>> host controller can select the open-drain bit to allow the device >>> initialization in the open-drain mode. Once the device enters >>> the standby mode this bit can be reset to enter push-pull mode. >>> >>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>> --- >>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>> drivers/mmc/host/dw_mmc.h | 1 + >>> 2 files changed, 15 insertions(+), 0 deletions(-) >>> >>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>> index 72dc3cd..da11e5a 100644 >>> --- a/drivers/mmc/host/dw_mmc.c >>> +++ b/drivers/mmc/host/dw_mmc.c >>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>> spin_unlock_bh(&host->lock); >>> } >>> >>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>> +{ >>> + struct mmc_ios *ios = &slot->mmc->ios; >>> + u32 reg; >>> + >>> + reg = mci_readl(slot->host, CTRL); >>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>> + else >>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>> +} >>> + >>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>> { >>> struct dw_mci_slot *slot = mmc_priv(mmc); >>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>> default: >>> break; >>> } >>> + >>> + dw_mci_set_busmode(slot); >>> } >>> >>> static int dw_mci_get_ro(struct mmc_host *mmc) >>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>> index 15c27e1..1a53fb2 100644 >>> --- a/drivers/mmc/host/dw_mmc.h >>> +++ b/drivers/mmc/host/dw_mmc.h >>> @@ -67,6 +67,7 @@ >>> >>> /* Control register defines */ >>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>> >> >> ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 11:43 ` Girish K S @ 2012-07-24 13:07 ` Jae hoon Chung 2012-07-24 13:09 ` Girish K S 2012-07-26 3:41 ` Girish K S 0 siblings, 2 replies; 11+ messages in thread From: Jae hoon Chung @ 2012-07-24 13:07 UTC (permalink / raw) To: Girish K S Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc Hi Girish, Right, it be mentioned about the open-drain mode in synopsys spec. But if didn't work on other board, there is some problem. We can consider the location of set_busmode() . Best Regards, Jaehoon Chung 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: > On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>> Hi Girish, >>> >>> Well..just tested on my board. >>> this patch didn't work.(eMMC card didn't initialize) >>> meaning of ios->bus_mode and synosys's bus_mode is same? > Yes it is same. synopsys spec says this is specific to MMC > initialization. when the card core sets this mode during > initialization. the host has to set this bit >>> How did you test this patch? >> Tested it on exynos5 board using dt patches of thomas (with some >> modification to his patch) >>> >>> Best Regards, >>> Jaehoon Chung >>> >>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>> Synopsis Designware host controller has suppport for open >>>> drain mode selection. During the mmc card initialization the >>>> host controller can select the open-drain bit to allow the device >>>> initialization in the open-drain mode. Once the device enters >>>> the standby mode this bit can be reset to enter push-pull mode. >>>> >>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>> --- >>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>> drivers/mmc/host/dw_mmc.h | 1 + >>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>> >>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>> index 72dc3cd..da11e5a 100644 >>>> --- a/drivers/mmc/host/dw_mmc.c >>>> +++ b/drivers/mmc/host/dw_mmc.c >>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>> spin_unlock_bh(&host->lock); >>>> } >>>> >>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>> +{ >>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>> + u32 reg; >>>> + >>>> + reg = mci_readl(slot->host, CTRL); >>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>> + else >>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>> +} >>>> + >>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>> { >>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>> default: >>>> break; >>>> } >>>> + >>>> + dw_mci_set_busmode(slot); >>>> } >>>> >>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>> index 15c27e1..1a53fb2 100644 >>>> --- a/drivers/mmc/host/dw_mmc.h >>>> +++ b/drivers/mmc/host/dw_mmc.h >>>> @@ -67,6 +67,7 @@ >>>> >>>> /* Control register defines */ >>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>> >>> >>> > -- > 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 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 13:07 ` Jae hoon Chung @ 2012-07-24 13:09 ` Girish K S 2012-07-24 13:44 ` Jae hoon Chung 2012-07-26 3:41 ` Girish K S 1 sibling, 1 reply; 11+ messages in thread From: Girish K S @ 2012-07-24 13:09 UTC (permalink / raw) To: Jae hoon Chung Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: > Hi Girish, > > Right, it be mentioned about the open-drain mode in synopsys spec. > But if didn't work on other board, there is some problem. > We can consider the location of set_busmode() . may i know the board on which you are testing. i will try to use the same and simulate the problem > > Best Regards, > Jaehoon Chung > > 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>> Hi Girish, >>>> >>>> Well..just tested on my board. >>>> this patch didn't work.(eMMC card didn't initialize) >>>> meaning of ios->bus_mode and synosys's bus_mode is same? >> Yes it is same. synopsys spec says this is specific to MMC >> initialization. when the card core sets this mode during >> initialization. the host has to set this bit >>>> How did you test this patch? >>> Tested it on exynos5 board using dt patches of thomas (with some >>> modification to his patch) >>>> >>>> Best Regards, >>>> Jaehoon Chung >>>> >>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>> Synopsis Designware host controller has suppport for open >>>>> drain mode selection. During the mmc card initialization the >>>>> host controller can select the open-drain bit to allow the device >>>>> initialization in the open-drain mode. Once the device enters >>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>> >>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>> --- >>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>> >>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>> index 72dc3cd..da11e5a 100644 >>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>> spin_unlock_bh(&host->lock); >>>>> } >>>>> >>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>> +{ >>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>> + u32 reg; >>>>> + >>>>> + reg = mci_readl(slot->host, CTRL); >>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>> + else >>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>> +} >>>>> + >>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>> { >>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>> default: >>>>> break; >>>>> } >>>>> + >>>>> + dw_mci_set_busmode(slot); >>>>> } >>>>> >>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>> index 15c27e1..1a53fb2 100644 >>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>> @@ -67,6 +67,7 @@ >>>>> >>>>> /* Control register defines */ >>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>> >>>> >>>> >> -- >> 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 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 13:09 ` Girish K S @ 2012-07-24 13:44 ` Jae hoon Chung 2012-07-25 13:22 ` Girish K S 0 siblings, 1 reply; 11+ messages in thread From: Jae hoon Chung @ 2012-07-24 13:44 UTC (permalink / raw) To: Girish K S Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: > On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: >> Hi Girish, >> >> Right, it be mentioned about the open-drain mode in synopsys spec. >> But if didn't work on other board, there is some problem. >> We can consider the location of set_busmode() . > may i know the board on which you are testing. i will try to use the > same and simulate the problem Exynos4 board and eMMC4.5 card, Synopsys IP version is 2.40a >> >> Best Regards, >> Jaehoon Chung >> >> 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >>> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>>> Hi Girish, >>>>> >>>>> Well..just tested on my board. >>>>> this patch didn't work.(eMMC card didn't initialize) >>>>> meaning of ios->bus_mode and synosys's bus_mode is same? >>> Yes it is same. synopsys spec says this is specific to MMC >>> initialization. when the card core sets this mode during >>> initialization. the host has to set this bit >>>>> How did you test this patch? >>>> Tested it on exynos5 board using dt patches of thomas (with some >>>> modification to his patch) >>>>> >>>>> Best Regards, >>>>> Jaehoon Chung >>>>> >>>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>>> Synopsis Designware host controller has suppport for open >>>>>> drain mode selection. During the mmc card initialization the >>>>>> host controller can select the open-drain bit to allow the device >>>>>> initialization in the open-drain mode. Once the device enters >>>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>>> >>>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>>> --- >>>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>>> >>>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>>> index 72dc3cd..da11e5a 100644 >>>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>>> spin_unlock_bh(&host->lock); >>>>>> } >>>>>> >>>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>>> +{ >>>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>>> + u32 reg; >>>>>> + >>>>>> + reg = mci_readl(slot->host, CTRL); >>>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>>> + else >>>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>>> +} >>>>>> + >>>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>> { >>>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>> default: >>>>>> break; >>>>>> } >>>>>> + >>>>>> + dw_mci_set_busmode(slot); >>>>>> } >>>>>> >>>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>>> index 15c27e1..1a53fb2 100644 >>>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>>> @@ -67,6 +67,7 @@ >>>>>> >>>>>> /* Control register defines */ >>>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>>> >>>>> >>>>> >>> -- >>> 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 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 13:44 ` Jae hoon Chung @ 2012-07-25 13:22 ` Girish K S 0 siblings, 0 replies; 11+ messages in thread From: Girish K S @ 2012-07-25 13:22 UTC (permalink / raw) To: Jae hoon Chung Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 24 July 2012 19:14, Jae hoon Chung <jh80.chung@gmail.com> wrote: > 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >> On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: >>> Hi Girish, >>> >>> Right, it be mentioned about the open-drain mode in synopsys spec. >>> But if didn't work on other board, there is some problem. >>> We can consider the location of set_busmode() . >> may i know the board on which you are testing. i will try to use the >> same and simulate the problem > Exynos4 board and eMMC4.5 card, Synopsys IP version is 2.40a Just now i tested it on exynos4 board/ eMMC 4.4 card Synopsis 2.40a host controller. Everything works fine. this patch doesnt have any side effect on the exynos4 board please check from ur end. might be some other issue. >>> >>> Best Regards, >>> Jaehoon Chung >>> >>> 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >>>> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>>>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>>>> Hi Girish, >>>>>> >>>>>> Well..just tested on my board. >>>>>> this patch didn't work.(eMMC card didn't initialize) >>>>>> meaning of ios->bus_mode and synosys's bus_mode is same? >>>> Yes it is same. synopsys spec says this is specific to MMC >>>> initialization. when the card core sets this mode during >>>> initialization. the host has to set this bit >>>>>> How did you test this patch? >>>>> Tested it on exynos5 board using dt patches of thomas (with some >>>>> modification to his patch) >>>>>> >>>>>> Best Regards, >>>>>> Jaehoon Chung >>>>>> >>>>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>>>> Synopsis Designware host controller has suppport for open >>>>>>> drain mode selection. During the mmc card initialization the >>>>>>> host controller can select the open-drain bit to allow the device >>>>>>> initialization in the open-drain mode. Once the device enters >>>>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>>>> >>>>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>>>> --- >>>>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>>>> >>>>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>>>> index 72dc3cd..da11e5a 100644 >>>>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>>>> spin_unlock_bh(&host->lock); >>>>>>> } >>>>>>> >>>>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>>>> +{ >>>>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>>>> + u32 reg; >>>>>>> + >>>>>>> + reg = mci_readl(slot->host, CTRL); >>>>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>>>> + else >>>>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>>>> +} >>>>>>> + >>>>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>>> { >>>>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>>> default: >>>>>>> break; >>>>>>> } >>>>>>> + >>>>>>> + dw_mci_set_busmode(slot); >>>>>>> } >>>>>>> >>>>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>>>> index 15c27e1..1a53fb2 100644 >>>>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>>>> @@ -67,6 +67,7 @@ >>>>>>> >>>>>>> /* Control register defines */ >>>>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>>>> >>>>>> >>>>>> >>>> -- >>>> 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 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-24 13:07 ` Jae hoon Chung 2012-07-24 13:09 ` Girish K S @ 2012-07-26 3:41 ` Girish K S 2012-07-26 6:00 ` Jaehoon Chung 1 sibling, 1 reply; 11+ messages in thread From: Girish K S @ 2012-07-26 3:41 UTC (permalink / raw) To: Jae hoon Chung Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: > Hi Girish, > > Right, it be mentioned about the open-drain mode in synopsys spec. > But if didn't work on other board, there is some problem. > We can consider the location of set_busmode() . Sure. Currently i am setting the bus mode after sending the command during the clock setting. since the bus mode has affect on the cmd line i will try to move the location of calling bus mode before setting the clock. you can just check whether card gets detected by moving the set mode function just below the switch statement of bus width. On my board irrespective of the set bus mode location it works fine > > Best Regards, > Jaehoon Chung > > 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>> Hi Girish, >>>> >>>> Well..just tested on my board. >>>> this patch didn't work.(eMMC card didn't initialize) >>>> meaning of ios->bus_mode and synosys's bus_mode is same? >> Yes it is same. synopsys spec says this is specific to MMC >> initialization. when the card core sets this mode during >> initialization. the host has to set this bit >>>> How did you test this patch? >>> Tested it on exynos5 board using dt patches of thomas (with some >>> modification to his patch) >>>> >>>> Best Regards, >>>> Jaehoon Chung >>>> >>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>> Synopsis Designware host controller has suppport for open >>>>> drain mode selection. During the mmc card initialization the >>>>> host controller can select the open-drain bit to allow the device >>>>> initialization in the open-drain mode. Once the device enters >>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>> >>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>> --- >>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>> >>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>> index 72dc3cd..da11e5a 100644 >>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>> spin_unlock_bh(&host->lock); >>>>> } >>>>> >>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>> +{ >>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>> + u32 reg; >>>>> + >>>>> + reg = mci_readl(slot->host, CTRL); >>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>> + else >>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>> +} >>>>> + >>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>> { >>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>> default: >>>>> break; >>>>> } >>>>> + >>>>> + dw_mci_set_busmode(slot); >>>>> } >>>>> >>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>> index 15c27e1..1a53fb2 100644 >>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>> @@ -67,6 +67,7 @@ >>>>> >>>>> /* Control register defines */ >>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>> >>>> >>>> >> -- >> 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 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-26 3:41 ` Girish K S @ 2012-07-26 6:00 ` Jaehoon Chung 2012-07-26 6:19 ` Girish K S 0 siblings, 1 reply; 11+ messages in thread From: Jaehoon Chung @ 2012-07-26 6:00 UTC (permalink / raw) To: Girish K S Cc: Jaehoon Chung, linux-mmc, cjb, will.newton, patches, linux-samsung-soc Hi Girish, I re-tested the your patch. How about locating into dw_mci_setup_bus()? And if compare the previously and current busmode, I think host needs not to re-write at register. For example, if (slot->bus_mode == ios->bus_mode) return; Then this patch looks good to me. Best Regards, Jaehoon Chung On 07/26/2012 12:41 PM, Girish K S wrote: > On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: >> Hi Girish, >> >> Right, it be mentioned about the open-drain mode in synopsys spec. >> But if didn't work on other board, there is some problem. >> We can consider the location of set_busmode() . > Sure. Currently i am setting the bus mode after sending the command > during the clock setting. since the bus mode has affect on the cmd > line i will try to move the location of calling bus mode before > setting the clock. > you can just check whether card gets detected by moving the set mode > function just below the switch statement of bus width. > On my board irrespective of the set bus mode location it works fine >> >> Best Regards, >> Jaehoon Chung >> >> 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >>> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>>> Hi Girish, >>>>> >>>>> Well..just tested on my board. >>>>> this patch didn't work.(eMMC card didn't initialize) >>>>> meaning of ios->bus_mode and synosys's bus_mode is same? >>> Yes it is same. synopsys spec says this is specific to MMC >>> initialization. when the card core sets this mode during >>> initialization. the host has to set this bit >>>>> How did you test this patch? >>>> Tested it on exynos5 board using dt patches of thomas (with some >>>> modification to his patch) >>>>> >>>>> Best Regards, >>>>> Jaehoon Chung >>>>> >>>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>>> Synopsis Designware host controller has suppport for open >>>>>> drain mode selection. During the mmc card initialization the >>>>>> host controller can select the open-drain bit to allow the device >>>>>> initialization in the open-drain mode. Once the device enters >>>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>>> >>>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>>> --- >>>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>>> >>>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>>> index 72dc3cd..da11e5a 100644 >>>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>>> spin_unlock_bh(&host->lock); >>>>>> } >>>>>> >>>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>>> +{ >>>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>>> + u32 reg; >>>>>> + >>>>>> + reg = mci_readl(slot->host, CTRL); >>>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>>> + else >>>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>>> +} >>>>>> + >>>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>> { >>>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>> default: >>>>>> break; >>>>>> } >>>>>> + >>>>>> + dw_mci_set_busmode(slot); >>>>>> } >>>>>> >>>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>>> index 15c27e1..1a53fb2 100644 >>>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>>> @@ -67,6 +67,7 @@ >>>>>> >>>>>> /* Control register defines */ >>>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>>> >>>>> >>>>> >>> -- >>> 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 > ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH] mmc: dw_mmc: add busmode selection support 2012-07-26 6:00 ` Jaehoon Chung @ 2012-07-26 6:19 ` Girish K S 0 siblings, 0 replies; 11+ messages in thread From: Girish K S @ 2012-07-26 6:19 UTC (permalink / raw) To: Jaehoon Chung; +Cc: linux-mmc, cjb, will.newton, patches, linux-samsung-soc On 26 July 2012 11:30, Jaehoon Chung <jh80.chung@samsung.com> wrote: > Hi Girish, > > I re-tested the your patch. > How about locating into dw_mci_setup_bus()? > > And if compare the previously and current busmode, > I think host needs not to re-write at register. > For example, > if (slot->bus_mode == ios->bus_mode) > return; > > Then this patch looks good to me. Thanks Jaehoon. I will try to test the same and let you know. if relocation is fine then i will send a patch > > Best Regards, > Jaehoon Chung > > On 07/26/2012 12:41 PM, Girish K S wrote: >> On 24 July 2012 18:37, Jae hoon Chung <jh80.chung@gmail.com> wrote: >>> Hi Girish, >>> >>> Right, it be mentioned about the open-drain mode in synopsys spec. >>> But if didn't work on other board, there is some problem. >>> We can consider the location of set_busmode() . >> Sure. Currently i am setting the bus mode after sending the command >> during the clock setting. since the bus mode has affect on the cmd >> line i will try to move the location of calling bus mode before >> setting the clock. >> you can just check whether card gets detected by moving the set mode >> function just below the switch statement of bus width. >> On my board irrespective of the set bus mode location it works fine >>> >>> Best Regards, >>> Jaehoon Chung >>> >>> 2012/7/24 Girish K S <girish.shivananjappa@linaro.org>: >>>> On 24 July 2012 17:06, Girish K S <girish.shivananjappa@linaro.org> wrote: >>>>> On 24 July 2012 16:39, Jaehoon Chung <jh80.chung@samsung.com> wrote: >>>>>> Hi Girish, >>>>>> >>>>>> Well..just tested on my board. >>>>>> this patch didn't work.(eMMC card didn't initialize) >>>>>> meaning of ios->bus_mode and synosys's bus_mode is same? >>>> Yes it is same. synopsys spec says this is specific to MMC >>>> initialization. when the card core sets this mode during >>>> initialization. the host has to set this bit >>>>>> How did you test this patch? >>>>> Tested it on exynos5 board using dt patches of thomas (with some >>>>> modification to his patch) >>>>>> >>>>>> Best Regards, >>>>>> Jaehoon Chung >>>>>> >>>>>> On 07/23/2012 08:16 PM, Girish K S wrote: >>>>>>> Synopsis Designware host controller has suppport for open >>>>>>> drain mode selection. During the mmc card initialization the >>>>>>> host controller can select the open-drain bit to allow the device >>>>>>> initialization in the open-drain mode. Once the device enters >>>>>>> the standby mode this bit can be reset to enter push-pull mode. >>>>>>> >>>>>>> Signed-off-by: Girish K S <girish.shivananjappa@linaro.org> >>>>>>> --- >>>>>>> drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ >>>>>>> drivers/mmc/host/dw_mmc.h | 1 + >>>>>>> 2 files changed, 15 insertions(+), 0 deletions(-) >>>>>>> >>>>>>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >>>>>>> index 72dc3cd..da11e5a 100644 >>>>>>> --- a/drivers/mmc/host/dw_mmc.c >>>>>>> +++ b/drivers/mmc/host/dw_mmc.c >>>>>>> @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) >>>>>>> spin_unlock_bh(&host->lock); >>>>>>> } >>>>>>> >>>>>>> +static void dw_mci_set_busmode(struct dw_mci_slot *slot) >>>>>>> +{ >>>>>>> + struct mmc_ios *ios = &slot->mmc->ios; >>>>>>> + u32 reg; >>>>>>> + >>>>>>> + reg = mci_readl(slot->host, CTRL); >>>>>>> + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) >>>>>>> + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); >>>>>>> + else >>>>>>> + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); >>>>>>> +} >>>>>>> + >>>>>>> static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>>> { >>>>>>> struct dw_mci_slot *slot = mmc_priv(mmc); >>>>>>> @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) >>>>>>> default: >>>>>>> break; >>>>>>> } >>>>>>> + >>>>>>> + dw_mci_set_busmode(slot); >>>>>>> } >>>>>>> >>>>>>> static int dw_mci_get_ro(struct mmc_host *mmc) >>>>>>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >>>>>>> index 15c27e1..1a53fb2 100644 >>>>>>> --- a/drivers/mmc/host/dw_mmc.h >>>>>>> +++ b/drivers/mmc/host/dw_mmc.h >>>>>>> @@ -67,6 +67,7 @@ >>>>>>> >>>>>>> /* Control register defines */ >>>>>>> #define SDMMC_CTRL_USE_IDMAC BIT(25) >>>>>>> +#define SDMMC_CTRL_ENABLE_OD BIT(24) >>>>>>> #define SDMMC_CTRL_CEATA_INT_EN BIT(11) >>>>>>> #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) >>>>>>> #define SDMMC_CTRL_SEND_CCSD BIT(9) >>>>>>> >>>>>> >>>>>> >>>> -- >>>> 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 >> > > ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2012-07-26 6:19 UTC | newest] Thread overview: 11+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-07-23 11:16 [PATCH] mmc: dw_mmc: add busmode selection support Girish K S 2012-07-24 11:09 ` Jaehoon Chung 2012-07-24 11:36 ` Girish K S 2012-07-24 11:43 ` Girish K S 2012-07-24 13:07 ` Jae hoon Chung 2012-07-24 13:09 ` Girish K S 2012-07-24 13:44 ` Jae hoon Chung 2012-07-25 13:22 ` Girish K S 2012-07-26 3:41 ` Girish K S 2012-07-26 6:00 ` Jaehoon Chung 2012-07-26 6:19 ` Girish K S
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