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soundwire: cadence_master: set frame shape and divider based on actual clk freq #5179

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Nov 12, 2024
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soundwire: cadence_master: set frame shape and divider based on actual clk freq #5179

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cf71c4a
soundwire: cadence_master: set frame shape and divider based on actua…
bardliao Sep 16, 2024
412607c
Revert "soundwire: intel_auxdevice: start the bus at default frequency"
bardliao Sep 12, 2024
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24 changes: 21 additions & 3 deletions drivers/soundwire/cadence_master.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1345,13 +1345,14 @@ static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
return val;
}

static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
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static int 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;
int freq;

dev_dbg(cdns->dev, "mclk %d max %d row %d col %d\n",
prop->mclk_freq,
Expand All @@ -1360,13 +1361,25 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
prop->default_col);

/* Set clock divider */
divider = (prop->mclk_freq / prop->max_clk_freq) - 1;
divider = (prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
bus->params.curr_dr_freq) - 1;
freq = bus->params.curr_dr_freq >> 1;

cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
CDNS_MCP_CLK_MCLKD_MASK, divider);
cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
CDNS_MCP_CLK_MCLKD_MASK, divider);

/* Set frame shape base on the actual bus frequency. */
if (!prop->default_frame_rate || !prop->default_row) {
dev_err(cdns->dev, "Default frame_rate %d or row %d is invalid\n",
prop->default_frame_rate, prop->default_row);
return -EINVAL;
}

prop->default_col = freq * SDW_DOUBLE_RATE_FACTOR /
prop->default_frame_rate / prop->default_row;

/*
* Frame shape changes after initialization have to be done
* with the bank switch mechanism
Expand All @@ -1379,6 +1392,8 @@ static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
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);

return 0;
}

/**
Expand Down Expand Up @@ -1412,9 +1427,12 @@ EXPORT_SYMBOL(sdw_cdns_soft_reset);
*/
int sdw_cdns_init(struct sdw_cdns *cdns)
{
int ret;
u32 val;

cdns_init_clock_ctrl(cdns);
ret = cdns_init_clock_ctrl(cdns);
if (ret)
return ret;

sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);

Expand Down
21 changes: 0 additions & 21 deletions drivers/soundwire/intel_auxdevice.c
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Original file line number Diff line number Diff line change
Expand Up @@ -222,30 +222,9 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus)

static int intel_prop_read(struct sdw_bus *bus)
{
struct sdw_master_prop *prop;

/* Initialize with default handler to read all DisCo properties */
sdw_master_read_prop(bus);

/*
* Only one bus frequency is supported so far, filter
* frequencies reported in the DSDT
*/
prop = &bus->prop;
if (prop->clk_freq && prop->num_clk_freq > 1) {
unsigned int default_bus_frequency;

default_bus_frequency =
prop->default_frame_rate *
prop->default_row *
prop->default_col /
SDW_DOUBLE_RATE_FACTOR;

prop->num_clk_freq = 1;
prop->clk_freq[0] = default_bus_frequency;
prop->max_clk_freq = default_bus_frequency;
}

/* read Intel-specific properties */
sdw_master_read_intel_prop(bus);

Expand Down
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