From: Rander Wang Date: Tue, 17 Mar 2020 16:33:15 +0000 (-0500) Subject: soundwire: cadence: add interface to check clock status X-Git-Tag: v5.15~4157^2~25^2~16 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5a885c52cfe6e5491fb7ce1d93d1a3d8f6fd6da9;p=platform%2Fkernel%2Flinux-starfive.git 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 Signed-off-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20200317163329.25501-4-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul --- diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 941809e..1bfdc1d 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 */ diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index 44e802b..691faa3 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -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