From: Tero Kristo <tero.kristo@xxxxxxxxx>
OMAP3 sleep can be prevented in some cases where OTG autoidle is enabled.
This patch force disables autoidle during wakeup from off-mode. See omap
errata 1.164.
Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxx>
---
arch/arm/mach-omap2/pm34xx.c | 6 ++++++
arch/arm/mach-omap2/usb-musb.c | 14 ++++++++------
arch/arm/plat-omap/include/mach/usb.h | 3 +++
3 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 5eb7321..070a0a2 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -39,6 +39,7 @@
#include <mach/gpmc.h>
#include <mach/dma.h>
#include <mach/dmtimer.h>
+#include <mach/usb.h>
#include <asm/tlbflush.h>
@@ -496,6 +497,11 @@ void omap_sram_idle(void)
omap3_prcm_restore_context();
omap3_sram_restore_context();
omap2_sms_restore_context();
+ /*
+ * Errata 1.164 fix : OTG autoidle can prevent
+ * sleep
+ */
+ usb_musb_disable_autoidle();
}
omap_uart_resume_idle(0);
omap_uart_resume_idle(1);
diff --git a/arch/arm/mach-omap2/usb-musb.c b/arch/arm/mach-omap2/usb-musb.c
index 8dde0b7..f4b86c0 100644
--- a/arch/arm/mach-omap2/usb-musb.c
+++ b/arch/arm/mach-omap2/usb-musb.c
@@ -44,10 +44,11 @@ static struct platform_device dummy_pdev = {
},
};
+static void __iomem *otg_base;
+static struct clk *otg_clk;
+
static void __init usb_musb_pm_init(void)
{
- void __iomem *otg_base;
- struct clk *otg_clk;
struct device *dev = &dummy_pdev.dev;
if (!cpu_is_omap34xx())
@@ -74,12 +75,13 @@ static void __init usb_musb_pm_init(void)
cpu_relax();
}
- if (otg_clk) {
+ if (otg_clk)
clk_disable(otg_clk);
- clk_put(otg_clk);
- }
+}
- iounmap(otg_base);
+void usb_musb_disable_autoidle(void)
+{
+ __raw_writel(0, otg_base + OTG_SYSCONFIG);
}
#ifdef CONFIG_USB_MUSB_SOC
diff --git a/arch/arm/plat-omap/include/mach/usb.h b/arch/arm/plat-omap/include/mach/usb.h
index a4068a4..310ee17 100644
--- a/arch/arm/plat-omap/include/mach/usb.h
+++ b/arch/arm/plat-omap/include/mach/usb.h
@@ -46,6 +46,9 @@ extern void usb_musb_init(void);
extern void usb_ehci_init(struct ehci_hcd_omap_platform_data *pdata);
+/* This is needed for OMAP3 errata 1.164: enabled autoidle can prevent sleep */
+extern void usb_musb_disable_autoidle(void);
+
#endif
void omap_usb_init(struct omap_usb_config *pdata);
--
1.5.4.3
--
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