In multi-master mode, the IP will only accept SSP intervals with integer relationships between the frame rate and the gsync frequency. E.g for a 48kHz frame rate and 4 kHz gsync signal, the SSP interval can only be 1, 2, 3, 4, 6, 12. To simplify we only allow one SSP per gsync interval. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> --- drivers/soundwire/cadence_master.c | 7 ++++--- drivers/soundwire/cadence_master.h | 3 +++ 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index fb697ff665f5..773341568d7e 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -183,7 +183,6 @@ MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask"); #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) /* Driver defaults */ -#define CDNS_DEFAULT_SSP_INTERVAL 0x18 #define CDNS_TX_TIMEOUT 2000 #define CDNS_SCP_RX_FIFOLEVEL 0x2 @@ -1048,6 +1047,7 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) struct sdw_bus *bus = &cdns->bus; struct sdw_master_prop *prop = &bus->prop; u32 val; + u32 ssp_interval; int divider; /* Set clock divider */ @@ -1067,8 +1067,9 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns) cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val); /* Set SSP interval to default value */ - cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, CDNS_DEFAULT_SSP_INTERVAL); - cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, CDNS_DEFAULT_SSP_INTERVAL); + ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ; + cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval); + cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval); } /** diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index e8fa5c7e09f4..b410656f8194 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -5,6 +5,9 @@ #ifndef __SDW_CADENCE_H #define __SDW_CADENCE_H +#define SDW_CADENCE_GSYNC_KHZ 4 /* 4 kHz */ +#define SDW_CADENCE_GSYNC_HZ (SDW_CADENCE_GSYNC_KHZ * 1000) + /** * struct sdw_cdns_pdi: PDI (Physical Data Interface) instance * -- 2.20.1
