| Message ID | 1346764151-21323-1-git-send-email-gururaja.hebbar@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Sep 04, 2012 at 18:39:11, Hebbar, Gururaja wrote: > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > on the HSMMC IP timing closure done for the high speed cards. > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > The MMC/SD/SDIO output signals can be driven on either falling edge or > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > to reach better timing performance, and thus to increase data transfer > frequency. > > There are few pre-requisites for enabling the HSPE bit > - Controller should support High-Speed-Enable Bit and > - Controller should not be using DDR Mode and > - Controller should advertise that it supports High Speed in > capabilities register and > - MMC/SD clock coming out of controller > 25MHz Gentle Ping. Is there any update on this patch?. If not, can this be pulled in. > > Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com> > --- > :100644 100644 be76a23... ed271fc... M Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > :100644 100644 eb3e4d5... 00c658b... M arch/arm/plat-omap/include/plat/mmc.h > :100644 100644 c3e96a2... 0e14834... M drivers/mmc/host/omap_hsmmc.c > .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 1 + > arch/arm/plat-omap/include/plat/mmc.h | 1 + > drivers/mmc/host/omap_hsmmc.c | 30 +++++++++++++++++++- > 3 files changed, 31 insertions(+), 1 deletions(-) > > diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > index be76a23..ed271fc 100644 > --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > @@ -19,6 +19,7 @@ ti,dual-volt: boolean, supports dual voltage cards > "supply-name" examples are "vmmc", "vmmc_aux" etc > ti,non-removable: non-removable slot (like eMMC) > ti,needs-special-reset: Requires a special softreset sequence > +ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed > > Example: > mmc1: mmc@0x4809c000 { > diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h > index eb3e4d5..00c658b 100644 > --- a/arch/arm/plat-omap/include/plat/mmc.h > +++ b/arch/arm/plat-omap/include/plat/mmc.h > @@ -127,6 +127,7 @@ struct omap_mmc_platform_data { > /* we can put the features above into this variable */ > #define HSMMC_HAS_PBIAS (1 << 0) > #define HSMMC_HAS_UPDATED_RESET (1 << 1) > +#define HSMMC_HAS_HSPE_SUPPORT (1 << 2) > unsigned features; > > int switch_pin; /* gpio (card detect) */ > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index c3e96a2..0e14834 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -63,6 +63,7 @@ > > #define VS18 (1 << 26) > #define VS30 (1 << 25) > +#define HSS (1 << 21) > #define SDVS18 (0x5 << 9) > #define SDVS30 (0x6 << 9) > #define SDVS33 (0x7 << 9) > @@ -90,6 +91,7 @@ > #define MSBS (1 << 5) > #define BCE (1 << 1) > #define FOUR_BIT (1 << 1) > +#define HSPE (1 << 2) > #define DDR (1 << 19) > #define DW8 (1 << 5) > #define CC 0x1 > @@ -490,6 +492,7 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > struct mmc_ios *ios = &host->mmc->ios; > unsigned long regval; > unsigned long timeout; > + unsigned long clkdiv; > > dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock); > > @@ -497,7 +500,8 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > > regval = OMAP_HSMMC_READ(host->base, SYSCTL); > regval = regval & ~(CLKD_MASK | DTO_MASK); > - regval = regval | (calc_divisor(host, ios) << 6) | (DTO << 16); > + clkdiv = calc_divisor(host, ios); > + regval = regval | (clkdiv << 6) | (DTO << 16); > OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); > OMAP_HSMMC_WRITE(host->base, SYSCTL, > OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); > @@ -508,6 +512,27 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > && time_before(jiffies, timeout)) > cpu_relax(); > > + /* > + * Enable High-Speed Support > + * Pre-Requisites > + * - Controller should support High-Speed-Enable Bit > + * - Controller should not be using DDR Mode > + * - Controller should advertise that it supports High Speed > + * in capabilities register > + * - MMC/SD clock coming out of controller > 25MHz > + */ > + if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) && > + (ios->timing != MMC_TIMING_UHS_DDR50) && > + ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) { > + regval = OMAP_HSMMC_READ(host->base, HCTL); > + if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000) > + regval |= HSPE; > + else > + regval &= ~HSPE; > + > + OMAP_HSMMC_WRITE(host->base, HCTL, regval); > + } > + > omap_hsmmc_start_clock(host); > } > > @@ -1701,6 +1726,9 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev) > if (of_find_property(np, "ti,needs-special-reset", NULL)) > pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET; > > + if (of_find_property(np, "ti,needs-special-hs-handling", NULL)) > + pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT; > + > return pdata; > } > #else > -- > 1.7.1 > > Regards, Gururaja -- 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 Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > on the HSMMC IP timing closure done for the high speed cards. > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > The MMC/SD/SDIO output signals can be driven on either falling edge or > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > to reach better timing performance, and thus to increase data transfer > frequency. > > There are few pre-requisites for enabling the HSPE bit > - Controller should support High-Speed-Enable Bit and > - Controller should not be using DDR Mode and > - Controller should advertise that it supports High Speed in > capabilities register and > - MMC/SD clock coming out of controller > 25MHz > The patch is well written. But then, I don't see a need for a DT binding for this feature. By definition, HS implies 25MHz or above, so that check seems to be redundant as well. Meanwhile, I'll check with HSPE enabled on OMAP. Regards, Venkat. -- 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 Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > on the HSMMC IP timing closure done for the high speed cards. > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > The MMC/SD/SDIO output signals can be driven on either falling edge or > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > to reach better timing performance, and thus to increase data transfer > frequency. Is this specific to some boards or all board with TI81xx ? What is the side-effect if not done ? > > There are few pre-requisites for enabling the HSPE bit > - Controller should support High-Speed-Enable Bit and > - Controller should not be using DDR Mode and > - Controller should advertise that it supports High Speed in > capabilities register and > - MMC/SD clock coming out of controller > 25MHz > > Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com> > --- > :100644 100644 be76a23... ed271fc... M Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > :100644 100644 eb3e4d5... 00c658b... M arch/arm/plat-omap/include/plat/mmc.h > :100644 100644 c3e96a2... 0e14834... M drivers/mmc/host/omap_hsmmc.c > .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 1 + > arch/arm/plat-omap/include/plat/mmc.h | 1 + > drivers/mmc/host/omap_hsmmc.c | 30 +++++++++++++++++++- > 3 files changed, 31 insertions(+), 1 deletions(-) > > diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > index be76a23..ed271fc 100644 > --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > @@ -19,6 +19,7 @@ ti,dual-volt: boolean, supports dual voltage cards > "supply-name" examples are "vmmc", "vmmc_aux" etc > ti,non-removable: non-removable slot (like eMMC) > ti,needs-special-reset: Requires a special softreset sequence > +ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed > > Example: > mmc1: mmc@0x4809c000 { > diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h > index eb3e4d5..00c658b 100644 > --- a/arch/arm/plat-omap/include/plat/mmc.h > +++ b/arch/arm/plat-omap/include/plat/mmc.h > @@ -127,6 +127,7 @@ struct omap_mmc_platform_data { > /* we can put the features above into this variable */ > #define HSMMC_HAS_PBIAS (1 << 0) > #define HSMMC_HAS_UPDATED_RESET (1 << 1) > +#define HSMMC_HAS_HSPE_SUPPORT (1 << 2) > unsigned features; > > int switch_pin; /* gpio (card detect) */ > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index c3e96a2..0e14834 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -63,6 +63,7 @@ > > #define VS18 (1 << 26) > #define VS30 (1 << 25) > +#define HSS (1 << 21) > #define SDVS18 (0x5 << 9) > #define SDVS30 (0x6 << 9) > #define SDVS33 (0x7 << 9) > @@ -90,6 +91,7 @@ > #define MSBS (1 << 5) > #define BCE (1 << 1) > #define FOUR_BIT (1 << 1) > +#define HSPE (1 << 2) > #define DDR (1 << 19) > #define DW8 (1 << 5) > #define CC 0x1 > @@ -490,6 +492,7 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > struct mmc_ios *ios = &host->mmc->ios; > unsigned long regval; > unsigned long timeout; > + unsigned long clkdiv; > > dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock); > > @@ -497,7 +500,8 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > > regval = OMAP_HSMMC_READ(host->base, SYSCTL); > regval = regval & ~(CLKD_MASK | DTO_MASK); > - regval = regval | (calc_divisor(host, ios) << 6) | (DTO << 16); > + clkdiv = calc_divisor(host, ios); > + regval = regval | (clkdiv << 6) | (DTO << 16); > OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); > OMAP_HSMMC_WRITE(host->base, SYSCTL, > OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); > @@ -508,6 +512,27 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) > && time_before(jiffies, timeout)) > cpu_relax(); > > + /* > + * Enable High-Speed Support > + * Pre-Requisites > + * - Controller should support High-Speed-Enable Bit > + * - Controller should not be using DDR Mode > + * - Controller should advertise that it supports High Speed > + * in capabilities register > + * - MMC/SD clock coming out of controller > 25MHz > + */ > + if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) && > + (ios->timing != MMC_TIMING_UHS_DDR50) && > + ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) { > + regval = OMAP_HSMMC_READ(host->base, HCTL); > + if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000) I think clkdiv is not needed clk_get_rate(host->fclk)/clkdiv is same as ios->clock > + regval |= HSPE; > + else > + regval &= ~HSPE; > + > + OMAP_HSMMC_WRITE(host->base, HCTL, regval); > + } > + > omap_hsmmc_start_clock(host); > } > > @@ -1701,6 +1726,9 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev) > if (of_find_property(np, "ti,needs-special-reset", NULL)) > pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET; > > + if (of_find_property(np, "ti,needs-special-hs-handling", NULL)) > + pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT; > + > return pdata; > } > #else > -- > 1.7.1 > > -- > 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 -- 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 Wed, Sep 12, 2012 at 14:51:34, Krishnamoorthy, Balaji T wrote: > On Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > > on the HSMMC IP timing closure done for the high speed cards. > > > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > > > The MMC/SD/SDIO output signals can be driven on either falling edge or > > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > > to reach better timing performance, and thus to increase data transfer > > frequency. > > Is this specific to some boards or all board with TI81xx ? > What is the side-effect if not done ? Platforms like (AM335x) needed this bit to be set in order to sustain high speed transfers. This was concluded after HSMMC IP timing closure was completed for High speed Cards. This was confirmed on high speed cards with very low setup/hold delay (in the order of nsec) was tested. For AM335x, this bit was to be set to meet setup requirement and hold requirement for MMC/SD HS cards. > > > > > There are few pre-requisites for enabling the HSPE bit > > - Controller should support High-Speed-Enable Bit and > > - Controller should not be using DDR Mode and > > - Controller should advertise that it supports High Speed in > > capabilities register and > > - MMC/SD clock coming out of controller > 25MHz > > > > Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com> > > --- > > :100644 100644 be76a23... ed271fc... M Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt > > :100644 100644 eb3e4d5... 00c658b... M arch/arm/plat-omap/include/plat/mmc.h > > :100644 100644 c3e96a2... 0e14834... M drivers/mmc/host/omap_hsmmc.c ..snip.. ..snip.. ..snip.. > > > > + /* > > + * Enable High-Speed Support > > + * Pre-Requisites > > + * - Controller should support High-Speed-Enable Bit > > + * - Controller should not be using DDR Mode > > + * - Controller should advertise that it supports High Speed > > + * in capabilities register > > + * - MMC/SD clock coming out of controller > 25MHz > > + */ > > + if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) && > > + (ios->timing != MMC_TIMING_UHS_DDR50) && > > + ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) { > > + regval = OMAP_HSMMC_READ(host->base, HCTL); > > + if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000) > > I think clkdiv is not needed > clk_get_rate(host->fclk)/clkdiv is same as ios->clock There are chances that the platform is not supporting Clock output from HSMMC IP greater than 25 MHz even if the card is High Speed. So it would be better to check host->fclk than ios->clock. Kindly correct me if I am wrong. > > > + regval |= HSPE; > > + else > > + regval &= ~HSPE; > > + > > + OMAP_HSMMC_WRITE(host->base, HCTL, regval); > > + } > > + > > omap_hsmmc_start_clock(host); > > } > > > > @@ -1701,6 +1726,9 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev) > > if (of_find_property(np, "ti,needs-special-reset", NULL)) > > pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET; > > > > + if (of_find_property(np, "ti,needs-special-hs-handling", NULL)) > > + pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT; > > + > > return pdata; > > } > > #else > > -- > > 1.7.1 > > > > -- > > 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 > Regards, Gururaja -- 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 Wed, Sep 12, 2012 at 14:19:51, S, Venkatraman wrote: > On Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > > on the HSMMC IP timing closure done for the high speed cards. > > > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > > > The MMC/SD/SDIO output signals can be driven on either falling edge or > > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > > to reach better timing performance, and thus to increase data transfer > > frequency. > > > > There are few pre-requisites for enabling the HSPE bit > > - Controller should support High-Speed-Enable Bit and > > - Controller should not be using DDR Mode and > > - Controller should advertise that it supports High Speed in > > capabilities register and > > - MMC/SD clock coming out of controller > 25MHz > > > > The patch is well written. But then, I don't see a need for a DT > binding for this feature. My reasons for DT Binding 1. Not all platforms using this driver has this bit (OMAP2) 2. Not all platforms using this driver needs this bit to be enabled (OMAP4) 3. Platforms which require this bit this to be set needs a method to inform driver. In order to not disturb old/unsupported platforms, I chose this DT method. > By definition, HS implies 25MHz or above, so that check seems to be > redundant as well. There are chances that the platform Max Clock output from HSMMC IP is < than 25 MHz even if the card is High Speed. In such cases it would be better to Confirm that the Clock output is actually > 25 MHz Kindly correct me if I am wrong. > Meanwhile, I'll check with HSPE enabled on OMAP. > > Regards, > Venkat. > Regards, Gururaja -- 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 Wed, Sep 12, 2012 at 17:32:38, Hebbar, Gururaja wrote: > On Wed, Sep 12, 2012 at 14:19:51, S, Venkatraman wrote: > > On Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > > > HSMMC IP on AM33xx need a special setting to handle High-speed cards. > > > Other platforms like TI81xx, OMAP4 may need this as-well. This depends > > > on the HSMMC IP timing closure done for the high speed cards. > > > > > > From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > > > > > > The MMC/SD/SDIO output signals can be driven on either falling edge or > > > rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > > > to reach better timing performance, and thus to increase data transfer > > > frequency. > > > > > > There are few pre-requisites for enabling the HSPE bit > > > - Controller should support High-Speed-Enable Bit and > > > - Controller should not be using DDR Mode and > > > - Controller should advertise that it supports High Speed in > > > capabilities register and > > > - MMC/SD clock coming out of controller > 25MHz > > > > > > > The patch is well written. But then, I don't see a need for a DT > > binding for this feature. > > My reasons for DT Binding > 1. Not all platforms using this driver has this bit (OMAP2) > 2. Not all platforms using this driver needs this bit to be enabled (OMAP4) > 3. Platforms which require this bit this to be set needs a method to inform > driver. > > In order to not disturb old/unsupported platforms, I chose this DT method. > > > By definition, HS implies 25MHz or above, so that check seems to be > > redundant as well. > > There are chances that the platform Max Clock output from HSMMC IP is < than > 25 MHz even if the card is High Speed. In such cases it would be better to > Confirm that the Clock output is actually > 25 MHz > > Kindly correct me if I am wrong. > > > Meanwhile, I'll check with HSPE enabled on OMAP. > > Gentle Ping. Matt Poter recently submitted EDMA related patches as RFC. He confirmed that basic mmc is working on AM335x with his edma patches. Above patch is required to get High-speed cards working on AM335x. I haven't seen any review comments for this. Can this be pulled in for 3.7? > > Regards, > > Venkat. > > > > > Regards, > Gururaja > Regards, Gururaja -- 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
Op 26 sep. 2012, om 13:37 heeft "Hebbar, Gururaja" <gururaja.hebbar@ti.com> het volgende geschreven: > On Wed, Sep 12, 2012 at 17:32:38, Hebbar, Gururaja wrote: >> On Wed, Sep 12, 2012 at 14:19:51, S, Venkatraman wrote: >>> On Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: >>>> HSMMC IP on AM33xx need a special setting to handle High-speed cards. >>>> Other platforms like TI81xx, OMAP4 may need this as-well. This depends >>>> on the HSMMC IP timing closure done for the high speed cards. >>>> >>>> From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) >>>> >>>> The MMC/SD/SDIO output signals can be driven on either falling edge or >>>> rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows >>>> to reach better timing performance, and thus to increase data transfer >>>> frequency. >>>> >>>> There are few pre-requisites for enabling the HSPE bit >>>> - Controller should support High-Speed-Enable Bit and >>>> - Controller should not be using DDR Mode and >>>> - Controller should advertise that it supports High Speed in >>>> capabilities register and >>>> - MMC/SD clock coming out of controller > 25MHz >>>> >>> >>> The patch is well written. But then, I don't see a need for a DT >>> binding for this feature. >> >> My reasons for DT Binding >> 1. Not all platforms using this driver has this bit (OMAP2) >> 2. Not all platforms using this driver needs this bit to be enabled (OMAP4) >> 3. Platforms which require this bit this to be set needs a method to inform >> driver. >> >> In order to not disturb old/unsupported platforms, I chose this DT method. >> >>> By definition, HS implies 25MHz or above, so that check seems to be >>> redundant as well. >> >> There are chances that the platform Max Clock output from HSMMC IP is < than >> 25 MHz even if the card is High Speed. In such cases it would be better to >> Confirm that the Clock output is actually > 25 MHz >> >> Kindly correct me if I am wrong. >> >>> Meanwhile, I'll check with HSPE enabled on OMAP. >>> > > Gentle Ping. > > Matt Poter recently submitted EDMA related patches as RFC. He confirmed that > basic mmc is working on AM335x with his edma patches. > > Above patch is required to get High-speed cards working on AM335x. > > I haven't seen any review comments for this. Can this be pulled in for 3.7? I had trouble applying this to 3.6-rc7, is that a known problem and should I try linux-next? regards, Koen-- 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 Thu, Sep 27, 2012 at 16:31:14, Koen Kooi wrote: > > Op 26 sep. 2012, om 13:37 heeft "Hebbar, Gururaja" <gururaja.hebbar@ti.com> het volgende geschreven: > > > On Wed, Sep 12, 2012 at 17:32:38, Hebbar, Gururaja wrote: > >> On Wed, Sep 12, 2012 at 14:19:51, S, Venkatraman wrote: > >>> On Tue, Sep 4, 2012 at 6:39 PM, Hebbar, Gururaja <gururaja.hebbar@ti.com> wrote: > >>>> HSMMC IP on AM33xx need a special setting to handle High-speed cards. > >>>> Other platforms like TI81xx, OMAP4 may need this as-well. This depends > >>>> on the HSMMC IP timing closure done for the high speed cards. > >>>> > >>>> From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) > >>>> > >>>> The MMC/SD/SDIO output signals can be driven on either falling edge or > >>>> rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows > >>>> to reach better timing performance, and thus to increase data transfer > >>>> frequency. > >>>> > >>>> There are few pre-requisites for enabling the HSPE bit > >>>> - Controller should support High-Speed-Enable Bit and > >>>> - Controller should not be using DDR Mode and > >>>> - Controller should advertise that it supports High Speed in > >>>> capabilities register and > >>>> - MMC/SD clock coming out of controller > 25MHz > >>>> > >>> > >>> The patch is well written. But then, I don't see a need for a DT > >>> binding for this feature. > >> > >> My reasons for DT Binding > >> 1. Not all platforms using this driver has this bit (OMAP2) > >> 2. Not all platforms using this driver needs this bit to be enabled (OMAP4) > >> 3. Platforms which require this bit this to be set needs a method to inform > >> driver. > >> > >> In order to not disturb old/unsupported platforms, I chose this DT method. > >> > >>> By definition, HS implies 25MHz or above, so that check seems to be > >>> redundant as well. > >> > >> There are chances that the platform Max Clock output from HSMMC IP is < than > >> 25 MHz even if the card is High Speed. In such cases it would be better to > >> Confirm that the Clock output is actually > 25 MHz > >> > >> Kindly correct me if I am wrong. > >> > >>> Meanwhile, I'll check with HSPE enabled on OMAP. > >>> > > > > Gentle Ping. > > > > Matt Poter recently submitted EDMA related patches as RFC. He confirmed that > > basic mmc is working on AM335x with his edma patches. > > > > Above patch is required to get High-speed cards working on AM335x. > > > > I haven't seen any review comments for this. Can this be pulled in for 3.7? > > I had trouble applying this to 3.6-rc7, is that a known problem and should I try linux-next? I just applied it applied it on Linux-next/master (locally merged with linux-omap-dt branch). It applied without any issues. > > regards, > > Koen Regards, Gururaja -- 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/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt index be76a23..ed271fc 100644 --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt @@ -19,6 +19,7 @@ ti,dual-volt: boolean, supports dual voltage cards "supply-name" examples are "vmmc", "vmmc_aux" etc ti,non-removable: non-removable slot (like eMMC) ti,needs-special-reset: Requires a special softreset sequence +ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed Example: mmc1: mmc@0x4809c000 { diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h index eb3e4d5..00c658b 100644 --- a/arch/arm/plat-omap/include/plat/mmc.h +++ b/arch/arm/plat-omap/include/plat/mmc.h @@ -127,6 +127,7 @@ struct omap_mmc_platform_data { /* we can put the features above into this variable */ #define HSMMC_HAS_PBIAS (1 << 0) #define HSMMC_HAS_UPDATED_RESET (1 << 1) +#define HSMMC_HAS_HSPE_SUPPORT (1 << 2) unsigned features; int switch_pin; /* gpio (card detect) */ diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index c3e96a2..0e14834 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -63,6 +63,7 @@ #define VS18 (1 << 26) #define VS30 (1 << 25) +#define HSS (1 << 21) #define SDVS18 (0x5 << 9) #define SDVS30 (0x6 << 9) #define SDVS33 (0x7 << 9) @@ -90,6 +91,7 @@ #define MSBS (1 << 5) #define BCE (1 << 1) #define FOUR_BIT (1 << 1) +#define HSPE (1 << 2) #define DDR (1 << 19) #define DW8 (1 << 5) #define CC 0x1 @@ -490,6 +492,7 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) struct mmc_ios *ios = &host->mmc->ios; unsigned long regval; unsigned long timeout; + unsigned long clkdiv; dev_vdbg(mmc_dev(host->mmc), "Set clock to %uHz\n", ios->clock); @@ -497,7 +500,8 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) regval = OMAP_HSMMC_READ(host->base, SYSCTL); regval = regval & ~(CLKD_MASK | DTO_MASK); - regval = regval | (calc_divisor(host, ios) << 6) | (DTO << 16); + clkdiv = calc_divisor(host, ios); + regval = regval | (clkdiv << 6) | (DTO << 16); OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); @@ -508,6 +512,27 @@ static void omap_hsmmc_set_clock(struct omap_hsmmc_host *host) && time_before(jiffies, timeout)) cpu_relax(); + /* + * Enable High-Speed Support + * Pre-Requisites + * - Controller should support High-Speed-Enable Bit + * - Controller should not be using DDR Mode + * - Controller should advertise that it supports High Speed + * in capabilities register + * - MMC/SD clock coming out of controller > 25MHz + */ + if ((mmc_slot(host).features & HSMMC_HAS_HSPE_SUPPORT) && + (ios->timing != MMC_TIMING_UHS_DDR50) && + ((OMAP_HSMMC_READ(host->base, CAPA) & HSS) == HSS)) { + regval = OMAP_HSMMC_READ(host->base, HCTL); + if (clkdiv && (clk_get_rate(host->fclk)/clkdiv) > 25000000) + regval |= HSPE; + else + regval &= ~HSPE; + + OMAP_HSMMC_WRITE(host->base, HCTL, regval); + } + omap_hsmmc_start_clock(host); } @@ -1701,6 +1726,9 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev) if (of_find_property(np, "ti,needs-special-reset", NULL)) pdata->slots[0].features |= HSMMC_HAS_UPDATED_RESET; + if (of_find_property(np, "ti,needs-special-hs-handling", NULL)) + pdata->slots[0].features |= HSMMC_HAS_HSPE_SUPPORT; + return pdata; } #else
HSMMC IP on AM33xx need a special setting to handle High-speed cards. Other platforms like TI81xx, OMAP4 may need this as-well. This depends on the HSMMC IP timing closure done for the high speed cards. From AM335x TRM (SPRUH73F - 18.3.12 Output Signals Generation) The MMC/SD/SDIO output signals can be driven on either falling edge or rising edge depending on the SD_HCTL[2] HSPE bit. This feature allows to reach better timing performance, and thus to increase data transfer frequency. There are few pre-requisites for enabling the HSPE bit - Controller should support High-Speed-Enable Bit and - Controller should not be using DDR Mode and - Controller should advertise that it supports High Speed in capabilities register and - MMC/SD clock coming out of controller > 25MHz Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com> --- :100644 100644 be76a23... ed271fc... M Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt :100644 100644 eb3e4d5... 00c658b... M arch/arm/plat-omap/include/plat/mmc.h :100644 100644 c3e96a2... 0e14834... M drivers/mmc/host/omap_hsmmc.c .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 1 + arch/arm/plat-omap/include/plat/mmc.h | 1 + drivers/mmc/host/omap_hsmmc.c | 30 +++++++++++++++++++- 3 files changed, 31 insertions(+), 1 deletions(-)