[PATCH] clocksource/drivers/timer-ti-dm: Save and restore timer TIOCP_CFG

[Tony Lindgren]

As we are using cpu_pm to save and restore context, we must also save and
restore the timer sysconfig register TIOCP_CFG. This is needed because
we are not calling PM runtime functions at all with cpu_pm.

Fixes: b34677b0999a ("clocksource/drivers/timer-ti-dm: Implement cpu_pm 
notifier for context save and restore")
Cc: Aaro Koskinen <aaro.koski...@iki.fi>
Cc: Adam Ford <aford...@gmail.com>
Cc: Andreas Kemnade <andr...@kemnade.info>
Cc: Lokesh Vutla <lokeshvu...@ti.com>
Cc: Peter Ujfalusi <peter.ujfal...@gmail.com>
Signed-off-by: Tony Lindgren <t...@atomide.com>
---
 drivers/clocksource/timer-ti-dm.c | 6 ++++++
 include/clocksource/timer-ti-dm.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/clocksource/timer-ti-dm.c 
b/drivers/clocksource/timer-ti-dm.c
--- a/drivers/clocksource/timer-ti-dm.c
+++ b/drivers/clocksource/timer-ti-dm.c
@@ -78,6 +78,9 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer 
*timer, u32 reg,
 
 static void omap_timer_restore_context(struct omap_dm_timer *timer)
 {
+       __omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET,
+                             timer->context.ocp_cfg, 0);
+
        omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
                                timer->context.twer);
        omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
@@ -95,6 +98,9 @@ static void omap_timer_restore_context(struct omap_dm_timer 
*timer)
 
 static void omap_timer_save_context(struct omap_dm_timer *timer)
 {
+       timer->context.ocp_cfg =
+               __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
+
        timer->context.tclr =
                        omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
        timer->context.twer =
diff --git a/include/clocksource/timer-ti-dm.h 
b/include/clocksource/timer-ti-dm.h
--- a/include/clocksource/timer-ti-dm.h
+++ b/include/clocksource/timer-ti-dm.h
@@ -74,6 +74,7 @@
 #define OMAP_TIMER_ERRATA_I103_I767                    0x80000000
 
 struct timer_regs {
+       u32 ocp_cfg;
        u32 tidr;
        u32 tier;
        u32 twer;
-- 
2.31.1