diff options
| -rw-r--r-- | drivers/gpu/drm/tegra/hdmi.c | 167 |
1 files changed, 58 insertions, 109 deletions
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c index 8fdff801c6f2..3ce551911548 100644 --- a/drivers/gpu/drm/tegra/hdmi.c +++ b/drivers/gpu/drm/tegra/hdmi.c @@ -11,6 +11,7 @@ #include <linux/debugfs.h> #include <linux/gpio.h> #include <linux/hdmi.h> +#include <linux/math64.h> #include <linux/of_device.h> #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> @@ -115,68 +116,11 @@ static inline void tegra_hdmi_writel(struct tegra_hdmi *hdmi, u32 value, } struct tegra_hdmi_audio_config { - unsigned int pclk; unsigned int n; unsigned int cts; unsigned int aval; }; -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_32k[] = { - { 25200000, 4096, 25200, 24000 }, - { 27000000, 4096, 27000, 24000 }, - { 74250000, 4096, 74250, 24000 }, - { 148500000, 4096, 148500, 24000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_44_1k[] = { - { 25200000, 5880, 26250, 25000 }, - { 27000000, 5880, 28125, 25000 }, - { 74250000, 4704, 61875, 20000 }, - { 148500000, 4704, 123750, 20000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_48k[] = { - { 25200000, 6144, 25200, 24000 }, - { 27000000, 6144, 27000, 24000 }, - { 74250000, 6144, 74250, 24000 }, - { 148500000, 6144, 148500, 24000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_88_2k[] = { - { 25200000, 11760, 26250, 25000 }, - { 27000000, 11760, 28125, 25000 }, - { 74250000, 9408, 61875, 20000 }, - { 148500000, 9408, 123750, 20000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_96k[] = { - { 25200000, 12288, 25200, 24000 }, - { 27000000, 12288, 27000, 24000 }, - { 74250000, 12288, 74250, 24000 }, - { 148500000, 12288, 148500, 24000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_176_4k[] = { - { 25200000, 23520, 26250, 25000 }, - { 27000000, 23520, 28125, 25000 }, - { 74250000, 18816, 61875, 20000 }, - { 148500000, 18816, 123750, 20000 }, - { 0, 0, 0, 0 }, -}; - -static const struct tegra_hdmi_audio_config tegra_hdmi_audio_192k[] = { - { 25200000, 24576, 25200, 24000 }, - { 27000000, 24576, 27000, 24000 }, - { 74250000, 24576, 74250, 24000 }, - { 148500000, 24576, 148500, 24000 }, - { 0, 0, 0, 0 }, -}; - static const struct tmds_config tegra20_tmds_config[] = { { /* slow pixel clock modes */ .pclk = 27000000, @@ -414,52 +358,53 @@ static const struct tmds_config tegra124_tmds_config[] = { }, }; -static const struct tegra_hdmi_audio_config * -tegra_hdmi_get_audio_config(unsigned int sample_rate, unsigned int pclk) +static int +tegra_hdmi_get_audio_config(unsigned int audio_freq, unsigned int pix_clock, + struct tegra_hdmi_audio_config *config) { - const struct tegra_hdmi_audio_config *table; - - switch (sample_rate) { - case 32000: - table = tegra_hdmi_audio_32k; - break; - - case 44100: - table = tegra_hdmi_audio_44_1k; - break; - - case 48000: - table = tegra_hdmi_audio_48k; - break; - - case 88200: - table = tegra_hdmi_audio_88_2k; - break; - - case 96000: - table = tegra_hdmi_audio_96k; - break; - - case 176400: - table = tegra_hdmi_audio_176_4k; - break; - - case 192000: - table = tegra_hdmi_audio_192k; - break; - - default: - return NULL; - } - - while (table->pclk) { - if (table->pclk == pclk) - return table; - - table++; + const unsigned int afreq = 128 * audio_freq; + const unsigned int min_n = afreq / 1500; + const unsigned int max_n = afreq / 300; + const unsigned int ideal_n = afreq / 1000; + int64_t min_err = (uint64_t)-1 >> 1; + unsigned int min_delta = -1; + int n; + + memset(config, 0, sizeof(*config)); + config->n = -1; + + for (n = min_n; n <= max_n; n++) { + uint64_t cts_f, aval_f; + unsigned int delta; + int64_t cts, err; + + /* compute aval in 48.16 fixed point */ + aval_f = ((int64_t)24000000 << 16) * n; + do_div(aval_f, afreq); + /* It should round without any rest */ + if (aval_f & 0xFFFF) + continue; + + /* Compute cts in 48.16 fixed point */ + cts_f = ((int64_t)pix_clock << 16) * n; + do_div(cts_f, afreq); + /* Round it to the nearest integer */ + cts = (cts_f & ~0xFFFF) + ((cts_f & BIT(15)) << 1); + + delta = abs(n - ideal_n); + + /* Compute the absolute error */ + err = abs((int64_t)cts_f - cts); + if (err < min_err || (err == min_err && delta < min_delta)) { + config->n = n; + config->cts = cts >> 16; + config->aval = aval_f >> 16; + min_delta = delta; + min_err = err; + } } - return NULL; + return config->n != -1 ? 0 : -EINVAL; } static void tegra_hdmi_setup_audio_fs_tables(struct tegra_hdmi *hdmi) @@ -515,8 +460,9 @@ static void tegra_hdmi_write_aval(struct tegra_hdmi *hdmi, u32 value) static int tegra_hdmi_setup_audio(struct tegra_hdmi *hdmi) { - const struct tegra_hdmi_audio_config *config; + struct tegra_hdmi_audio_config config; u32 source, value; + int err; switch (hdmi->audio_source) { case HDA: @@ -591,25 +537,28 @@ static int tegra_hdmi_setup_audio(struct tegra_hdmi *hdmi) tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_AUDIO_SPARE0); } - config = tegra_hdmi_get_audio_config(hdmi->format.sample_rate, - hdmi->pixel_clock); - if (!config) { + err = tegra_hdmi_get_audio_config(hdmi->format.sample_rate, + hdmi->pixel_clock, &config); + if (err < 0) { dev_err(hdmi->dev, "cannot set audio to %u Hz at %u Hz pixel clock\n", hdmi->format.sample_rate, hdmi->pixel_clock); - return -EINVAL; + return err; } + dev_dbg(hdmi->dev, "audio: pixclk=%u, n=%u, cts=%u, aval=%u\n", + hdmi->pixel_clock, config.n, config.cts, config.aval); + tegra_hdmi_writel(hdmi, 0, HDMI_NV_PDISP_HDMI_ACR_CTRL); value = AUDIO_N_RESETF | AUDIO_N_GENERATE_ALTERNATE | - AUDIO_N_VALUE(config->n - 1); + AUDIO_N_VALUE(config.n - 1); tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_AUDIO_N); - tegra_hdmi_writel(hdmi, ACR_SUBPACK_N(config->n) | ACR_ENABLE, + tegra_hdmi_writel(hdmi, ACR_SUBPACK_N(config.n) | ACR_ENABLE, HDMI_NV_PDISP_HDMI_ACR_0441_SUBPACK_HIGH); - tegra_hdmi_writel(hdmi, ACR_SUBPACK_CTS(config->cts), + tegra_hdmi_writel(hdmi, ACR_SUBPACK_CTS(config.cts), HDMI_NV_PDISP_HDMI_ACR_0441_SUBPACK_LOW); value = SPARE_HW_CTS | SPARE_FORCE_SW_CTS | SPARE_CTS_RESET_VAL(1); @@ -620,7 +569,7 @@ static int tegra_hdmi_setup_audio(struct tegra_hdmi *hdmi) tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_AUDIO_N); if (hdmi->config->has_hda) - tegra_hdmi_write_aval(hdmi, config->aval); + tegra_hdmi_write_aval(hdmi, config.aval); tegra_hdmi_setup_audio_fs_tables(hdmi); |