diff options
| author | Rander Wang <rander.wang@intel.com> | 2020-03-17 19:33:15 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-03-19 10:13:03 +0300 |
| commit | 5a885c52cfe6e5491fb7ce1d93d1a3d8f6fd6da9 (patch) | |
| tree | 0ca47e69babacceaa9314bb80bfcc16b16591cec /drivers/soundwire/cadence_master.c | |
| parent | 7b174f24f4cfb8e13a89c4493aa3d0c6ac062e0c (diff) | |
| download | linux-5a885c52cfe6e5491fb7ce1d93d1a3d8f6fd6da9.tar.xz | |
soundwire: cadence: add interface to check clock status
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>
Link: https://lore.kernel.org/r/20200317163329.25501-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire/cadence_master.c')
| -rw-r--r-- | drivers/soundwire/cadence_master.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 941809ea00a8..1bfdc1d4fcb1 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -1208,6 +1208,17 @@ static const struct sdw_master_port_ops cdns_port_ops = { }; /** + * sdw_cdns_is_clock_stop: Check clock status + * + * @cdns: Cadence instance + */ +bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) +{ + return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); +} +EXPORT_SYMBOL(sdw_cdns_is_clock_stop); + +/** * sdw_cdns_probe() - Cadence probe routine * @cdns: Cadence instance */ |