| Message ID | 1352471435-9560-1-git-send-email-t-kristo@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
HI, On Fri, Nov 09, 2012 at 04:30:35PM +0200, Tero Kristo wrote: > Commit c9e4412ab8eb8ef82d645d8749c4ce96ad490007 removed all of the USB > PHY functions for OMAP4, but this causes a problem with core retention > as the MUSB module remains enabled if omap-usb2 phy driver is not used. > This keeps the USB DPLL enabled and prevents l3_init pwrdm from idling. > > Fixed by adding a minimal function back that disables the USB PHY during > boot. > > Signed-off-by: Tero Kristo <t-kristo@ti.com> > Cc: Kishon Vijay Abraham I <kishon@ti.com> > Cc: Felipe Balbi <balbi@ti.com> > Cc: Tony Lindgren <tony@atomide.com> > Cc: Kevin Hilman <khilman@ti.com> looks good to me. I would still suggest adding a REVISIT or FIXME note stating that this should be moved to SCM driver eventually ;-) Other than that: Acked-by: Felipe Balbi <balbi@ti.com> > --- > arch/arm/mach-omap2/omap_phy_internal.c | 32 +++++++++++++++++++++++++++++++ > 1 files changed, 32 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mach-omap2/omap_phy_internal.c b/arch/arm/mach-omap2/omap_phy_internal.c > index d992db8..9b56e5e 100644 > --- a/arch/arm/mach-omap2/omap_phy_internal.c > +++ b/arch/arm/mach-omap2/omap_phy_internal.c > @@ -33,6 +33,38 @@ > #include "soc.h" > #include "control.h" > > +#define CONTROL_DEV_CONF 0x300 > +#define PHY_PD 0x1 > + > +/** > + * omap4430_phy_power_down: disable MUSB PHY during early init > + * > + * OMAP4 MUSB PHY module is enabled by default on reset, but this will > + * prevent core retention if not disabled by SW. USB driver will > + * later on enable this, once and if the driver needs it. > + */ > +static int __init omap4430_phy_power_down(void) > +{ > + void __iomem *ctrl_base; > + > + if (!cpu_is_omap44xx()) > + return 0; > + > + ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K); > + if (!ctrl_base) { > + pr_err("control module ioremap failed\n"); > + return -ENOMEM; > + } > + > + /* Power down the phy */ > + __raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF); > + > + iounmap(ctrl_base); > + > + return 0; > +} > +early_initcall(omap4430_phy_power_down); > + > void am35x_musb_reset(void) > { > u32 regval; > -- > 1.7.4.1 >
Felipe Balbi <balbi@ti.com> writes: > HI, > > On Fri, Nov 09, 2012 at 04:30:35PM +0200, Tero Kristo wrote: >> Commit c9e4412ab8eb8ef82d645d8749c4ce96ad490007 removed all of the USB >> PHY functions for OMAP4, but this causes a problem with core retention >> as the MUSB module remains enabled if omap-usb2 phy driver is not used. >> This keeps the USB DPLL enabled and prevents l3_init pwrdm from idling. >> >> Fixed by adding a minimal function back that disables the USB PHY during >> boot. >> >> Signed-off-by: Tero Kristo <t-kristo@ti.com> >> Cc: Kishon Vijay Abraham I <kishon@ti.com> >> Cc: Felipe Balbi <balbi@ti.com> >> Cc: Tony Lindgren <tony@atomide.com> >> Cc: Kevin Hilman <khilman@ti.com> > > looks good to me. I would still suggest adding a REVISIT or FIXME note > stating that this should be moved to SCM driver eventually ;-) > > Other than that: > > Acked-by: Felipe Balbi <balbi@ti.com> Thanks will try to get this in for v3.8 along with the original patch 4/9 which gets full-chip retention working on OMAP4. Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" 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/arch/arm/mach-omap2/omap_phy_internal.c b/arch/arm/mach-omap2/omap_phy_internal.c index d992db8..9b56e5e 100644 --- a/arch/arm/mach-omap2/omap_phy_internal.c +++ b/arch/arm/mach-omap2/omap_phy_internal.c @@ -33,6 +33,38 @@ #include "soc.h" #include "control.h" +#define CONTROL_DEV_CONF 0x300 +#define PHY_PD 0x1 + +/** + * omap4430_phy_power_down: disable MUSB PHY during early init + * + * OMAP4 MUSB PHY module is enabled by default on reset, but this will + * prevent core retention if not disabled by SW. USB driver will + * later on enable this, once and if the driver needs it. + */ +static int __init omap4430_phy_power_down(void) +{ + void __iomem *ctrl_base; + + if (!cpu_is_omap44xx()) + return 0; + + ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K); + if (!ctrl_base) { + pr_err("control module ioremap failed\n"); + return -ENOMEM; + } + + /* Power down the phy */ + __raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF); + + iounmap(ctrl_base); + + return 0; +} +early_initcall(omap4430_phy_power_down); + void am35x_musb_reset(void) { u32 regval;
Commit c9e4412ab8eb8ef82d645d8749c4ce96ad490007 removed all of the USB PHY functions for OMAP4, but this causes a problem with core retention as the MUSB module remains enabled if omap-usb2 phy driver is not used. This keeps the USB DPLL enabled and prevents l3_init pwrdm from idling. Fixed by adding a minimal function back that disables the USB PHY during boot. Signed-off-by: Tero Kristo <t-kristo@ti.com> Cc: Kishon Vijay Abraham I <kishon@ti.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Kevin Hilman <khilman@ti.com> --- arch/arm/mach-omap2/omap_phy_internal.c | 32 +++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-)