diff options
Diffstat (limited to 'drivers/video/omap2/dss/hdmi.c')
| -rw-r--r-- | drivers/video/omap2/dss/hdmi.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c index 0f8efc961e6b..0cdb11976091 100644 --- a/drivers/video/omap2/dss/hdmi.c +++ b/drivers/video/omap2/dss/hdmi.c @@ -554,6 +554,48 @@ static void hdmi_put_clocks(void) clk_put(hdmi.sys_clk); } +#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO) +int hdmi_compute_acr(u32 sample_freq, u32 *n, u32 *cts) +{ + u32 deep_color; + u32 pclk = hdmi.ip_data.cfg.timings.pixel_clock; + + if (n == NULL || cts == NULL) + return -EINVAL; + + /* TODO: When implemented, query deep color mode here. */ + deep_color = 100; + + switch (sample_freq) { + case 32000: + if ((deep_color == 125) && ((pclk == 54054) || + (pclk == 74250))) + *n = 8192; + else + *n = 4096; + break; + case 44100: + *n = 6272; + break; + case 48000: + if ((deep_color == 125) && ((pclk == 54054) || + (pclk == 74250))) + *n = 8192; + else + *n = 6144; + break; + default: + *n = 0; + return -EINVAL; + } + + /* Calculate CTS. See HDMI 1.3a or 1.4a specifications */ + *cts = pclk * (*n / 128) * deep_color / (sample_freq / 10); + + return 0; +} +#endif + static void __init hdmi_probe_pdata(struct platform_device *pdev) { struct omap_dss_board_info *pdata = pdev->dev.platform_data; |