diff options
Diffstat (limited to 'sound/soc/intel/skylake/skl-nhlt.c')
| -rw-r--r-- | sound/soc/intel/skylake/skl-nhlt.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/sound/soc/intel/skylake/skl-nhlt.c b/sound/soc/intel/skylake/skl-nhlt.c index 26b0a5c..3b1d2b8 100644 --- a/sound/soc/intel/skylake/skl-nhlt.c +++ b/sound/soc/intel/skylake/skl-nhlt.c @@ -19,6 +19,7 @@ */ #include <linux/pci.h> #include "skl.h" +#include "skl-i2s.h" #define NHLT_ACPI_HEADER_SIG "NHLT" @@ -277,3 +278,157 @@ void skl_nhlt_remove_sysfs(struct skl *skl) sysfs_remove_file(&dev->kobj, &dev_attr_platform_id.attr); } + +/* + * Queries NHLT for all the fmt configuration for a particular endpoint and + * stores all possible rates supported in a rate table for the corresponding + * sclk/sclkfs. + */ +static void skl_get_ssp_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks, + struct nhlt_fmt *fmt, u8 id) +{ + struct skl_i2s_config_blob_legacy *i2s_config; + struct skl_clk_parent_src *parent; + struct skl_ssp_clk *sclk, *sclkfs; + struct nhlt_fmt_cfg *fmt_cfg; + struct wav_fmt_ext *wav_fmt; + unsigned long rate = 0; + bool present = false; + int rate_index = 0; + u16 channels, bps; + u8 clk_src; + int i, j; + u32 fs; + + sclk = &ssp_clks[SKL_SCLK_OFS]; + sclkfs = &ssp_clks[SKL_SCLKFS_OFS]; + + if (fmt->fmt_count == 0) + return; + + for (i = 0; i < fmt->fmt_count; i++) { + fmt_cfg = &fmt->fmt_config[i]; + wav_fmt = &fmt_cfg->fmt_ext; + + channels = wav_fmt->fmt.channels; + bps = wav_fmt->fmt.bits_per_sample; + fs = wav_fmt->fmt.samples_per_sec; + + /* + * In case of TDM configuration on a ssp, there can + * be more than one blob in which channel masks are + * different for each usecase for a specific rate and bps. + * But the sclk rate will be generated for the total + * number of channels used for that endpoint. + * + * So for the given fs and bps, choose blob which has + * the superset of all channels for that endpoint and + * derive the rate. + */ + for (j = i; j < fmt->fmt_count; j++) { + fmt_cfg = &fmt->fmt_config[j]; + wav_fmt = &fmt_cfg->fmt_ext; + if ((fs == wav_fmt->fmt.samples_per_sec) && + (bps == wav_fmt->fmt.bits_per_sample)) + channels = max_t(u16, channels, + wav_fmt->fmt.channels); + } + + rate = channels * bps * fs; + + /* check if the rate is added already to the given SSP's sclk */ + for (j = 0; (j < SKL_MAX_CLK_RATES) && + (sclk[id].rate_cfg[j].rate != 0); j++) { + if (sclk[id].rate_cfg[j].rate == rate) { + present = true; + break; + } + } + + /* Fill rate and parent for sclk/sclkfs */ + if (!present) { + /* MCLK Divider Source Select */ + i2s_config = (struct skl_i2s_config_blob_legacy *) + fmt->fmt_config[0].config.caps; + clk_src = ((i2s_config->mclk.mdivctrl) + & SKL_MNDSS_DIV_CLK_SRC_MASK) >> + SKL_SHIFT(SKL_MNDSS_DIV_CLK_SRC_MASK); + + parent = skl_get_parent_clk(clk_src); + + /* + * Do not copy the config data if there is no parent + * clock available for this clock source select + */ + if (!parent) + continue; + + sclk[id].rate_cfg[rate_index].rate = rate; + sclk[id].rate_cfg[rate_index].config = fmt_cfg; + sclkfs[id].rate_cfg[rate_index].rate = rate; + sclkfs[id].rate_cfg[rate_index].config = fmt_cfg; + sclk[id].parent_name = parent->name; + sclkfs[id].parent_name = parent->name; + + rate_index++; + } + } +} + +static void skl_get_mclk(struct skl *skl, struct skl_ssp_clk *mclk, + struct nhlt_fmt *fmt, u8 id) +{ + struct skl_i2s_config_blob_legacy *i2s_config; + struct nhlt_specific_cfg *fmt_cfg; + struct skl_clk_parent_src *parent; + u32 clkdiv, div_ratio; + u8 clk_src; + + fmt_cfg = &fmt->fmt_config[0].config; + i2s_config = (struct skl_i2s_config_blob_legacy *)fmt_cfg->caps; + + /* MCLK Divider Source Select */ + clk_src = ((i2s_config->mclk.mdivctrl) & SKL_MCLK_DIV_CLK_SRC_MASK) >> + SKL_SHIFT(SKL_MCLK_DIV_CLK_SRC_MASK); + + clkdiv = i2s_config->mclk.mdivr & SKL_MCLK_DIV_RATIO_MASK; + + /* bypass divider */ + div_ratio = 1; + + if (clkdiv != SKL_MCLK_DIV_RATIO_MASK) + /* Divider is 2 + clkdiv */ + div_ratio = clkdiv + 2; + + /* Calculate MCLK rate from source using div value */ + parent = skl_get_parent_clk(clk_src); + if (!parent) + return; + + mclk[id].rate_cfg[0].rate = parent->rate/div_ratio; + mclk[id].rate_cfg[0].config = &fmt->fmt_config[0]; + mclk[id].parent_name = parent->name; +} + +void skl_get_clks(struct skl *skl, struct skl_ssp_clk *ssp_clks) +{ + struct nhlt_acpi_table *nhlt = (struct nhlt_acpi_table *)skl->nhlt; + struct nhlt_endpoint *epnt; + struct nhlt_fmt *fmt; + int i; + u8 id; + + epnt = (struct nhlt_endpoint *)nhlt->desc; + for (i = 0; i < nhlt->endpoint_count; i++) { + if (epnt->linktype == NHLT_LINK_SSP) { + id = epnt->virtual_bus_id; + + fmt = (struct nhlt_fmt *)(epnt->config.caps + + epnt->config.size); + + skl_get_ssp_clks(skl, ssp_clks, fmt, id); + skl_get_mclk(skl, ssp_clks, fmt, id); + } + epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length); + } +} |
