[PATCH 4/9] bus: ti-sysc: Add quirk handling for reset on re-init

Tony Lindgren
2021-09-21T10:01:44Z

At least am335x gpmc module needs a reset in addition to re-init on resume.
Let's add a quirk handling for reset on re-init.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
drivers/bus/ti-sysc.c | 10 ++++++++++
include/linux/platform_data/ti-sysc.h | 1 +
2 files changed, 11 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -157,6 +157,7 @@ struct sysc {

static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
bool is_child);
+static int sysc_reset(struct sysc *ddata);

static void sysc_write(struct sysc *ddata, int offset, u32 value)
{
@@ -1440,6 +1441,15 @@ static int sysc_reinit_module(struct sysc *ddata, bool leave_enabled)
if (error)
dev_warn(dev, "reinit resume failed: %i\n", error);

+ /* Some modules like am335x gpmc need reset and restore of sysconfig */
+ if (ddata->cfg.quirks & SYSC_QUIRK_RESET_ON_CTX_LOST) {
+ error = sysc_reset(ddata);
+ if (error)
+ dev_warn(dev, "reinit reset failed: %i\n", error);
+
+ sysc_write_sysconfig(ddata, ddata->sysconfig);
+ }
+
if (leave_enabled)
return error;

diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -50,6 +50,7 @@ struct sysc_regbits {
s8 emufree_shift;
};

+#define SYSC_QUIRK_RESET_ON_CTX_LOST BIT(29)
#define SYSC_QUIRK_REINIT_ON_CTX_LOST BIT(28)
#define SYSC_QUIRK_REINIT_ON_RESUME BIT(27)
#define SYSC_QUIRK_GPMC_DEBUG BIT(26)
--
2.33.0