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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>
This commit is contained in:
Rander Wang 2020-03-17 11:33:15 -05:00 committed by Vinod Koul
parent 7b174f24f4
commit 5a885c52cf
2 changed files with 13 additions and 0 deletions
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11
drivers/soundwire/cadence_master.c
View File

@ -1207,6 +1207,17 @@ 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)
{
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

2
drivers/soundwire/cadence_master.h
View File

@ -144,6 +144,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state);
bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns);
#ifdef CONFIG_DEBUG_FS
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
#endif