ARM: OMAP2+: CM: increase the module disable timeout

Increase the timeout for disabling an IP block to five milliseconds.
This is to handle the usb_host_fs idle latency, which takes almost
four milliseconds after a host controller reset.

This is the second of two patches needed to resolve the following
boot warning:

omap_hwmod: usb_host_fs: _wait_target_disable failed

Thanks to Sergei Shtylyov <sshtylyov@mvista.com> for finding
an unrelated hunk in a previous version of this patch.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: Tero Kristo <t-kristo@ti.com>

diff --git a/arch/arm/mach-omap2/cm.h b/arch/arm/mach-omap2/cm.h
index a7bc096bd407445ed8e248c6c9803435ddc406eb..f24e3f7a2bbc248389ac234c4b80e9f2ef4d5e03 100644 (file)
--- a/arch/arm/mach-omap2/cm.h
+++ b/arch/arm/mach-omap2/cm.h
@@ -22,4 +22,15 @@
  */
 #define MAX_MODULE_READY_TIME          2000
 
+/*
+ * MAX_MODULE_DISABLE_TIME: max duration in microseconds to wait for
+ * the PRCM to request that a module enter the inactive state in the
+ * case of OMAP2 & 3.  In the case of OMAP4 this is the max duration
+ * in microseconds for the module to reach the inactive state from
+ * a functional state.
+ * XXX FSUSB on OMAP4430 takes ~4ms to idle after reset during
+ * kernel init.
+ */
+#define MAX_MODULE_DISABLE_TIME                5000
+
 #endif

diff --git a/arch/arm/mach-omap2/cminst44xx.c b/arch/arm/mach-omap2/cminst44xx.c
index 8c86d294b1a326b6ea8bbf07239cb92983ba5f50..1a39945d9ff81fd5ed9a78f785c6fe08d3f1f939 100644 (file)
--- a/arch/arm/mach-omap2/cminst44xx.c
+++ b/arch/arm/mach-omap2/cminst44xx.c
@@ -313,9 +313,9 @@ int omap4_cminst_wait_module_idle(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_off
 
        omap_test_timeout((_clkctrl_idlest(part, inst, cdoffs, clkctrl_offs) ==
                           CLKCTRL_IDLEST_DISABLED),
-                         MAX_MODULE_READY_TIME, i);
+                         MAX_MODULE_DISABLE_TIME, i);
 
-       return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
+       return (i < MAX_MODULE_DISABLE_TIME) ? 0 : -EBUSY;
 }
 
 /**