diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2019-08-06 02:55:17 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-08-21 11:06:02 +0200 |
| commit | 3859872f47c4b7d7a767df9e60ca4b44bbbcb0e2 (patch) | |
| tree | 8a7d00c75b1544d72c7cd3dda41be5b00b67ce90 /drivers/soundwire | |
| parent | soundwire: intel: read mclk_freq property from firmware (diff) | |
| download | linux-3859872f47c4b7d7a767df9e60ca4b44bbbcb0e2.tar.xz linux-3859872f47c4b7d7a767df9e60ca4b44bbbcb0e2.zip | |
soundwire: cadence_master: make use of mclk_freq property
Now that the prototype and Intel implementation are enabled, use this
property to avoid hard-coded values.
For example for ICL the mclk_freq value is 38.4 MHz while on CNL/CML
it's 24 MHz. The mclk_freq should not be confused with the
max_clk_freq, which si the maximum bus clock. The mclk_freq is
typically tied to the oscillator frequency and does not change between
platforms. The max_clk_freq value is linked to the maximum bandwidth
needed and topology/trace length.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190806005522.22642-13-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
| -rw-r--r-- | drivers/soundwire/cadence_master.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 7dab1e40382a..eea5618083fe 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -174,8 +174,6 @@ #define CDNS_PDI_CONFIG_PORT GENMASK(4, 0) /* Driver defaults */ - -#define CDNS_DEFAULT_CLK_DIVIDER 0 #define CDNS_DEFAULT_SSP_INTERVAL 0x18 #define CDNS_TX_TIMEOUT 2000 @@ -828,7 +826,10 @@ static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols) */ int sdw_cdns_init(struct sdw_cdns *cdns) { + struct sdw_bus *bus = &cdns->bus; + struct sdw_master_prop *prop = &bus->prop; u32 val; + int divider; int ret; /* Exit clock stop */ @@ -840,9 +841,11 @@ int sdw_cdns_init(struct sdw_cdns *cdns) } /* Set clock divider */ + divider = (prop->mclk_freq / prop->max_clk_freq) - 1; val = cdns_readl(cdns, CDNS_MCP_CLK_CTRL0); - val |= CDNS_DEFAULT_CLK_DIVIDER; + val |= divider; cdns_writel(cdns, CDNS_MCP_CLK_CTRL0, val); + cdns_writel(cdns, CDNS_MCP_CLK_CTRL1, val); /* * Frame shape changes after initialization have to be done @@ -890,6 +893,7 @@ EXPORT_SYMBOL(sdw_cdns_init); int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) { + struct sdw_master_prop *prop = &bus->prop; struct sdw_cdns *cdns = bus_to_cdns(bus); int mcp_clkctrl_off, mcp_clkctrl; int divider; @@ -899,7 +903,9 @@ int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params) return -EINVAL; } - divider = (params->max_dr_freq / params->curr_dr_freq) - 1; + divider = prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR / + params->curr_dr_freq; + divider--; /* divider is 1/(N+1) */ if (params->next_bank) mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1; |