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Subject[PATCH 5/6] soundwire: cadence_master: make clock stop exit configurable on init
Date
The use of clock stop is not a requirement, the IP can e.g. be
completely power gated and not detect any wakes while in s2idle/deep
sleep.

For now clock-stop is not supported anyways so the control parameter
is always false. This will be revisited when we add clock stop.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/cadence_master.c | 15 ++++++++-------
drivers/soundwire/cadence_master.h | 2 +-
drivers/soundwire/intel.c | 2 +-
3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
index fdf9eec7cde1..17ac2ecd8d5c 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -1000,7 +1000,7 @@ static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
* sdw_cdns_init() - Cadence initialization
* @cdns: Cadence instance
*/
-int sdw_cdns_init(struct sdw_cdns *cdns)
+int sdw_cdns_init(struct sdw_cdns *cdns, bool clock_stop_exit)
{
struct sdw_bus *bus = &cdns->bus;
struct sdw_master_prop *prop = &bus->prop;
@@ -1008,12 +1008,13 @@ int sdw_cdns_init(struct sdw_cdns *cdns)
int divider;
int ret;

- /* Exit clock stop */
- ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
- CDNS_MCP_CONTROL_CLK_STOP_CLR);
- if (ret < 0) {
- dev_err(cdns->dev, "Couldn't exit from clock stop\n");
- return ret;
+ if (clock_stop_exit) {
+ ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
+ CDNS_MCP_CONTROL_CLK_STOP_CLR);
+ if (ret < 0) {
+ dev_err(cdns->dev, "Couldn't exit from clock stop\n");
+ return ret;
+ }
}

/* Set clock divider */
diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index 302351808098..9d7a48ac6fc4 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -158,7 +158,7 @@ extern struct sdw_master_ops sdw_cdns_master_ops;
irqreturn_t sdw_cdns_irq(int irq, void *dev_id);
irqreturn_t sdw_cdns_thread(int irq, void *dev_id);

-int sdw_cdns_init(struct sdw_cdns *cdns);
+int sdw_cdns_init(struct sdw_cdns *cdns, bool clock_stop_exit);
int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
struct sdw_cdns_stream_config config);
int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 42bdc870c3ee..fd2d0a9ccb00 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1052,7 +1052,7 @@ static int intel_init(struct sdw_intel *sdw)
intel_link_power_up(sdw);
intel_shim_init(sdw);

- return sdw_cdns_init(&sdw->cdns);
+ return sdw_cdns_init(&sdw->cdns, false);
}

/*
--
2.20.1
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