On 11-03-20, 13:41, Pierre-Louis Bossart wrote:
From: Rander Wang rander.wang@intel.com
If master is in clock stop state, driver can't modify registers in master except the registers for clock stop setting.
Signed-off-by: Rander Wang rander.wang@intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
drivers/soundwire/cadence_master.c | 19 +++++++++++++++++++ drivers/soundwire/cadence_master.h | 2 ++ 2 files changed, 21 insertions(+)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 941809ea00a8..71cba2585151 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -1207,6 +1207,25 @@ static const struct sdw_master_port_ops cdns_port_ops = { .dpn_port_enable_ch = cdns_port_enable, };
+/**
- sdw_cdns_is_clock_stop: Check clock status
- @cdns: Cadence instance
- */
+bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) +{
- u32 status;
- status = cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP;
- if (status) {
dev_dbg(cdns->dev, "Clock is stopped\n");return true;- }
This can be further optimized to:
return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);