* Re: [PATCHv2] ARM: OMAP4: USB: power down MUSB PHY during boot
2012-11-09 14:30 [PATCHv2] ARM: OMAP4: USB: power down MUSB PHY during boot Tero Kristo
@ 2012-11-09 14:30 ` Felipe Balbi
2012-11-14 0:03 ` Kevin Hilman
0 siblings, 1 reply; 3+ messages in thread
From: Felipe Balbi @ 2012-11-09 14:30 UTC (permalink / raw)
To: Tero Kristo
Cc: linux-omap, linux-arm-kernel, Kishon Vijay Abraham I,
Felipe Balbi, Tony Lindgren, Kevin Hilman
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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
>
--
balbi
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCHv2] ARM: OMAP4: USB: power down MUSB PHY during boot
@ 2012-11-09 14:30 Tero Kristo
2012-11-09 14:30 ` Felipe Balbi
0 siblings, 1 reply; 3+ messages in thread
From: Tero Kristo @ 2012-11-09 14:30 UTC (permalink / raw)
To: linux-omap
Cc: linux-arm-kernel, Kishon Vijay Abraham I, Felipe Balbi,
Tony Lindgren, Kevin Hilman
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(-)
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCHv2] ARM: OMAP4: USB: power down MUSB PHY during boot
2012-11-09 14:30 ` Felipe Balbi
@ 2012-11-14 0:03 ` Kevin Hilman
0 siblings, 0 replies; 3+ messages in thread
From: Kevin Hilman @ 2012-11-14 0:03 UTC (permalink / raw)
To: balbi
Cc: Tero Kristo, linux-omap, linux-arm-kernel,
Kishon Vijay Abraham I, Tony Lindgren
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
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-11-09 14:30 [PATCHv2] ARM: OMAP4: USB: power down MUSB PHY during boot Tero Kristo
2012-11-09 14:30 ` Felipe Balbi
2012-11-14 0:03 ` Kevin Hilman
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