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

Commit Message

Tony Lindgren April 15, 2021, 8:55 a.m. UTC

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 <[e-mail]>
Cc: Adam Ford <[e-mail]>
Cc: Andreas Kemnade <[e-mail]>
Cc: Lokesh Vutla <[e-mail]>
Cc: Peter Ujfalusi <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>
---
 drivers/clocksource/timer-ti-dm.c | 6 ++++++
 include/clocksource/timer-ti-dm.h | 1 +
 2 files changed, 7 insertions(+)

Patch

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;