Varadarajan, Charulatha had written, on 11/30/2010 12:07 AM, the following:
Nishant,
On Tue, Nov 30, 2010 at 01:49, Nishanth Menon <nm@xxxxxx> wrote:
Erratum id: i608
RTA (Retention Till Access) feature is not supported and leads to device
stability issues when enabled. This impacts modules with embedded memories
on OMAP3630
Workaround is to disable RTA on boot and coming out of core off.
For disabling rta coming out of off mode, we do this by overriding the
restore pointer for 3630 to allow us restore handler as the first point of
entry before caches are touched and is common for GP and HS devices.
to disable earlier than this could be possible by modifying the ppa for HS
devices, but not for GP devices.
Signed-off-by: Ambresh K <ambresh@xxxxxx>
not in Cc?
It was initially written by me and co-developed with Ambresh and I took
it up back again for upstreaming :)
Signed-off-by: Nishanth Menon <nm@xxxxxx>
---
v2: fixed missing b restore for 3430 es3.1 code.
introduced erratum handling logic here splitting it out of uart errata
typo fixes for erratum
v1: http://marc.info/?l=linux-omap&m=129013172825240&w=2
arch/arm/mach-omap2/control.c | 5 ++++-
arch/arm/mach-omap2/control.h | 5 +++++
arch/arm/mach-omap2/pm34xx.c | 23 +++++++++++++++++++++++
arch/arm/mach-omap2/sleep34xx.S | 26 ++++++++++++++++++++++++++
4 files changed, 58 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 1fa3294..728f268 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -241,7 +241,10 @@ void omap3_save_scratchpad_contents(void)
/* Populate the Scratchpad contents */
scratchpad_contents.boot_config_ptr = 0x0;
- if (omap_rev() != OMAP3430_REV_ES3_0 &&
+ if (cpu_is_omap3630())
+ scratchpad_contents.public_restore_ptr =
+ virt_to_phys(get_omap3630_restore_pointer());
+ else if (omap_rev() != OMAP3430_REV_ES3_0 &&
omap_rev() != OMAP3430_REV_ES3_1)
scratchpad_contents.public_restore_ptr =
virt_to_phys(get_restore_pointer());
diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h
index b6c6b7c..d7911c5 100644
--- a/arch/arm/mach-omap2/control.h
+++ b/arch/arm/mach-omap2/control.h
@@ -204,6 +204,10 @@
#define OMAP343X_CONTROL_WKUP_DEBOBS3 (OMAP343X_CONTROL_GENERAL_WKUP + 0x014)
#define OMAP343X_CONTROL_WKUP_DEBOBS4 (OMAP343X_CONTROL_GENERAL_WKUP + 0x018)
+/* 36xx-only RTA - Retention till Accesss control registers and bits */
+#define OMAP36XX_CONTROL_MEM_RTA_CTRL 0x40C
+#define OMAP36XX_RTA_DISABLE 0x0
+
/* 34xx D2D idle-related pins, handled by PM core */
#define OMAP3_PADCONF_SAD2D_MSTANDBY 0x250
#define OMAP3_PADCONF_SAD2D_IDLEACK 0x254
@@ -347,6 +351,7 @@ extern void omap3_save_scratchpad_contents(void);
extern void omap3_clear_scratchpad_contents(void);
extern u32 *get_restore_pointer(void);
extern u32 *get_es3_restore_pointer(void);
+extern u32 *get_omap3630_restore_pointer(void);
extern u32 omap3_arm_context[128];
extern void omap3_control_save_context(void);
extern void omap3_control_restore_context(void);
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 75c0cd1..bd426cc 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -54,6 +54,10 @@
#define OMAP343X_TABLE_VALUE_OFFSET 0xc0
#define OMAP343X_CONTROL_REG_VALUE_OFFSET 0xc8
+#define RTA_ERRATUM_i608 (1 << 0)
+static u16 pm34xx_errata;
+#define IS_PM34XX_ERRATUM(id) (pm34xx_errata & (id))
+
struct power_state {
struct powerdomain *pwrdm;
u32 next_state;
@@ -979,6 +983,14 @@ void omap_push_sram_idle(void)
save_secure_ram_context_sz);
}
+static void pm_errata_configure(void)
+{
+ if (cpu_is_omap34xx()) {
+ if (cpu_is_omap3630())
Is it required to have both the cpu_is checks*? Why?
hmm... good point.. pm_init already checks of cpu_is_omap34xx() and
returns.. I guess I was simply paranoid -> I will remove this in next
rev. thanks.
--
Regards,
Nishanth Menon
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