drm/tegra: sor: Support for audio over HDMI

This code is very similar to the audio over HDMI support on older chips.
Interoperation with the audio codec is done via a pair of codec scratch
registers and an interrupt that is raised at the SOR when the codec has
written those registers.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2018-12-03 15:46:03 +01:00
parent e75d04771a
commit 8e2988a76c
2 changed files with 297 additions and 0 deletions

View File

@ -19,6 +19,8 @@
#include <soc/tegra/pmc.h>
#include <sound/hda_verbs.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_panel.h>
@ -407,6 +409,7 @@ struct tegra_sor {
const struct tegra_sor_soc *soc;
void __iomem *regs;
unsigned int index;
unsigned int irq;
struct reset_control *rst;
struct clk *clk_parent;
@ -433,6 +436,11 @@ struct tegra_sor {
struct delayed_work scdc;
bool scdc_enabled;
struct {
unsigned int sample_rate;
unsigned int channels;
} audio;
};
struct tegra_sor_state {
@ -2139,6 +2147,144 @@ tegra_sor_hdmi_setup_avi_infoframe(struct tegra_sor *sor,
return 0;
}
static void tegra_sor_write_eld(struct tegra_sor *sor)
{
size_t length = drm_eld_size(sor->output.connector.eld), i;
for (i = 0; i < length; i++)
tegra_sor_writel(sor, i << 8 | sor->output.connector.eld[i],
SOR_AUDIO_HDA_ELD_BUFWR);
/*
* The HDA codec will always report an ELD buffer size of 96 bytes and
* the HDA codec driver will check that each byte read from the buffer
* is valid. Therefore every byte must be written, even if no 96 bytes
* were parsed from EDID.
*/
for (i = length; i < 96; i++)
tegra_sor_writel(sor, i << 8 | 0, SOR_AUDIO_HDA_ELD_BUFWR);
}
static void tegra_sor_audio_prepare(struct tegra_sor *sor)
{
u32 value;
tegra_sor_write_eld(sor);
value = SOR_AUDIO_HDA_PRESENSE_ELDV | SOR_AUDIO_HDA_PRESENSE_PD;
tegra_sor_writel(sor, value, SOR_AUDIO_HDA_PRESENSE);
}
static void tegra_sor_audio_unprepare(struct tegra_sor *sor)
{
tegra_sor_writel(sor, 0, SOR_AUDIO_HDA_PRESENSE);
}
static int tegra_sor_hdmi_enable_audio_infoframe(struct tegra_sor *sor)
{
u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
struct hdmi_audio_infoframe frame;
u32 value;
int err;
err = hdmi_audio_infoframe_init(&frame);
if (err < 0) {
dev_err(sor->dev, "failed to setup audio infoframe: %d\n", err);
return err;
}
frame.channels = sor->audio.channels;
err = hdmi_audio_infoframe_pack(&frame, buffer, sizeof(buffer));
if (err < 0) {
dev_err(sor->dev, "failed to pack audio infoframe: %d\n", err);
return err;
}
tegra_sor_hdmi_write_infopack(sor, buffer, err);
value = tegra_sor_readl(sor, SOR_HDMI_AUDIO_INFOFRAME_CTRL);
value |= INFOFRAME_CTRL_CHECKSUM_ENABLE;
value |= INFOFRAME_CTRL_ENABLE;
tegra_sor_writel(sor, value, SOR_HDMI_AUDIO_INFOFRAME_CTRL);
return 0;
}
static void tegra_sor_hdmi_audio_enable(struct tegra_sor *sor)
{
u32 value;
value = tegra_sor_readl(sor, SOR_AUDIO_CNTRL);
/* select HDA audio input */
value &= ~SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_MASK);
value |= SOR_AUDIO_CNTRL_SOURCE_SELECT(SOURCE_SELECT_HDA);
/* inject null samples */
if (sor->audio.channels != 2)
value &= ~SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
else
value |= SOR_AUDIO_CNTRL_INJECT_NULLSMPL;
value |= SOR_AUDIO_CNTRL_AFIFO_FLUSH;
tegra_sor_writel(sor, value, SOR_AUDIO_CNTRL);
/* enable advertising HBR capability */
tegra_sor_writel(sor, SOR_AUDIO_SPARE_HBR_ENABLE, SOR_AUDIO_SPARE);
tegra_sor_writel(sor, 0, SOR_HDMI_ACR_CTRL);
value = SOR_HDMI_SPARE_ACR_PRIORITY_HIGH |
SOR_HDMI_SPARE_CTS_RESET(1) |
SOR_HDMI_SPARE_HW_CTS_ENABLE;
tegra_sor_writel(sor, value, SOR_HDMI_SPARE);
/* enable HW CTS */
value = SOR_HDMI_ACR_SUBPACK_LOW_SB1(0);
tegra_sor_writel(sor, value, SOR_HDMI_ACR_0441_SUBPACK_LOW);
/* allow packet to be sent */
value = SOR_HDMI_ACR_SUBPACK_HIGH_ENABLE;
tegra_sor_writel(sor, value, SOR_HDMI_ACR_0441_SUBPACK_HIGH);
/* reset N counter and enable lookup */
value = SOR_HDMI_AUDIO_N_RESET | SOR_HDMI_AUDIO_N_LOOKUP;
tegra_sor_writel(sor, value, SOR_HDMI_AUDIO_N);
value = (24000 * 4096) / (128 * sor->audio.sample_rate / 1000);
tegra_sor_writel(sor, value, SOR_AUDIO_AVAL_0320);
tegra_sor_writel(sor, 4096, SOR_AUDIO_NVAL_0320);
tegra_sor_writel(sor, 20000, SOR_AUDIO_AVAL_0441);
tegra_sor_writel(sor, 4704, SOR_AUDIO_NVAL_0441);
tegra_sor_writel(sor, 20000, SOR_AUDIO_AVAL_0882);
tegra_sor_writel(sor, 9408, SOR_AUDIO_NVAL_0882);
tegra_sor_writel(sor, 20000, SOR_AUDIO_AVAL_1764);
tegra_sor_writel(sor, 18816, SOR_AUDIO_NVAL_1764);
value = (24000 * 6144) / (128 * sor->audio.sample_rate / 1000);
tegra_sor_writel(sor, value, SOR_AUDIO_AVAL_0480);
tegra_sor_writel(sor, 6144, SOR_AUDIO_NVAL_0480);
value = (24000 * 12288) / (128 * sor->audio.sample_rate / 1000);
tegra_sor_writel(sor, value, SOR_AUDIO_AVAL_0960);
tegra_sor_writel(sor, 12288, SOR_AUDIO_NVAL_0960);
value = (24000 * 24576) / (128 * sor->audio.sample_rate / 1000);
tegra_sor_writel(sor, value, SOR_AUDIO_AVAL_1920);
tegra_sor_writel(sor, 24576, SOR_AUDIO_NVAL_1920);
value = tegra_sor_readl(sor, SOR_HDMI_AUDIO_N);
value &= ~SOR_HDMI_AUDIO_N_RESET;
tegra_sor_writel(sor, value, SOR_HDMI_AUDIO_N);
tegra_sor_hdmi_enable_audio_infoframe(sor);
}
static void tegra_sor_hdmi_disable_audio_infoframe(struct tegra_sor *sor)
{
u32 value;
@ -2148,6 +2294,11 @@ static void tegra_sor_hdmi_disable_audio_infoframe(struct tegra_sor *sor)
tegra_sor_writel(sor, value, SOR_HDMI_AUDIO_INFOFRAME_CTRL);
}
static void tegra_sor_hdmi_audio_disable(struct tegra_sor *sor)
{
tegra_sor_hdmi_disable_audio_infoframe(sor);
}
static struct tegra_sor_hdmi_settings *
tegra_sor_hdmi_find_settings(struct tegra_sor *sor, unsigned long frequency)
{
@ -2243,6 +2394,7 @@ static void tegra_sor_hdmi_disable(struct drm_encoder *encoder)
u32 value;
int err;
tegra_sor_audio_unprepare(sor);
tegra_sor_hdmi_scdc_stop(sor);
err = tegra_sor_detach(sor);
@ -2651,6 +2803,7 @@ static void tegra_sor_hdmi_enable(struct drm_encoder *encoder)
dev_err(sor->dev, "failed to wakeup SOR: %d\n", err);
tegra_sor_hdmi_scdc_start(sor);
tegra_sor_audio_prepare(sor);
}
static const struct drm_encoder_helper_funcs tegra_sor_hdmi_helpers = {
@ -2666,6 +2819,7 @@ static int tegra_sor_init(struct host1x_client *client)
struct tegra_sor *sor = host1x_client_to_sor(client);
int connector = DRM_MODE_CONNECTOR_Unknown;
int encoder = DRM_MODE_ENCODER_NONE;
u32 value;
int err;
if (!sor->aux) {
@ -2759,6 +2913,15 @@ static int tegra_sor_init(struct host1x_client *client)
if (err < 0)
return err;
/*
* Enable and unmask the HDA codec SCRATCH0 register interrupt. This
* is used for interoperability between the HDA codec driver and the
* HDMI/DP driver.
*/
value = SOR_INT_CODEC_SCRATCH1 | SOR_INT_CODEC_SCRATCH0;
tegra_sor_writel(sor, value, SOR_INT_ENABLE);
tegra_sor_writel(sor, value, SOR_INT_MASK);
return 0;
}
@ -2767,6 +2930,9 @@ static int tegra_sor_exit(struct host1x_client *client)
struct tegra_sor *sor = host1x_client_to_sor(client);
int err;
tegra_sor_writel(sor, 0, SOR_INT_MASK);
tegra_sor_writel(sor, 0, SOR_INT_ENABLE);
tegra_output_exit(&sor->output);
if (sor->aux) {
@ -3037,6 +3203,54 @@ static int tegra_sor_parse_dt(struct tegra_sor *sor)
return 0;
}
static void tegra_hda_parse_format(unsigned int format, unsigned int *rate,
unsigned int *channels)
{
unsigned int mul, div;
if (format & AC_FMT_BASE_44K)
*rate = 44100;
else
*rate = 48000;
mul = (format & AC_FMT_MULT_MASK) >> AC_FMT_MULT_SHIFT;
div = (format & AC_FMT_DIV_MASK) >> AC_FMT_DIV_SHIFT;
*rate = *rate * (mul + 1) / (div + 1);
*channels = (format & AC_FMT_CHAN_MASK) >> AC_FMT_CHAN_SHIFT;
}
static irqreturn_t tegra_sor_irq(int irq, void *data)
{
struct tegra_sor *sor = data;
u32 value;
value = tegra_sor_readl(sor, SOR_INT_STATUS);
tegra_sor_writel(sor, value, SOR_INT_STATUS);
if (value & SOR_INT_CODEC_SCRATCH0) {
value = tegra_sor_readl(sor, SOR_AUDIO_HDA_CODEC_SCRATCH0);
if (value & SOR_AUDIO_HDA_CODEC_SCRATCH0_VALID) {
unsigned int format, sample_rate, channels;
format = value & SOR_AUDIO_HDA_CODEC_SCRATCH0_FMT_MASK;
tegra_hda_parse_format(format, &sample_rate, &channels);
sor->audio.sample_rate = sample_rate;
sor->audio.channels = channels;
tegra_sor_hdmi_audio_enable(sor);
} else {
tegra_sor_hdmi_audio_disable(sor);
}
}
return IRQ_HANDLED;
}
static int tegra_sor_probe(struct platform_device *pdev)
{
struct device_node *np;
@ -3119,6 +3333,21 @@ static int tegra_sor_probe(struct platform_device *pdev)
goto remove;
}
err = platform_get_irq(pdev, 0);
if (err < 0) {
dev_err(&pdev->dev, "failed to get IRQ: %d\n", err);
goto remove;
}
sor->irq = err;
err = devm_request_irq(sor->dev, sor->irq, tegra_sor_irq, 0,
dev_name(sor->dev), sor);
if (err < 0) {
dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
goto remove;
}
if (!pdev->dev.pm_domain) {
sor->rst = devm_reset_control_get(&pdev->dev, "sor");
if (IS_ERR(sor->rst)) {

View File

@ -364,12 +364,28 @@
#define INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) << 8)
#define INFOFRAME_HEADER_TYPE(x) (((x) & 0xff) << 0)
#define SOR_HDMI_ACR_CTRL 0xb1
#define SOR_HDMI_ACR_0320_SUBPACK_LOW 0xb2
#define SOR_HDMI_ACR_SUBPACK_LOW_SB1(x) (((x) & 0xff) << 24)
#define SOR_HDMI_ACR_0320_SUBPACK_HIGH 0xb3
#define SOR_HDMI_ACR_SUBPACK_HIGH_ENABLE (1 << 31)
#define SOR_HDMI_ACR_0441_SUBPACK_LOW 0xb4
#define SOR_HDMI_ACR_0441_SUBPACK_HIGH 0xb5
#define SOR_HDMI_CTRL 0xc0
#define SOR_HDMI_CTRL_ENABLE (1 << 30)
#define SOR_HDMI_CTRL_MAX_AC_PACKET(x) (((x) & 0x1f) << 16)
#define SOR_HDMI_CTRL_AUDIO_LAYOUT (1 << 10)
#define SOR_HDMI_CTRL_REKEY(x) (((x) & 0x7f) << 0)
#define SOR_HDMI_SPARE 0xcb
#define SOR_HDMI_SPARE_ACR_PRIORITY_HIGH (1 << 31)
#define SOR_HDMI_SPARE_CTS_RESET(x) (((x) & 0x7) << 16)
#define SOR_HDMI_SPARE_HW_CTS_ENABLE (1 << 0)
#define SOR_REFCLK 0xe6
#define SOR_REFCLK_DIV_INT(x) ((((x) >> 2) & 0xff) << 8)
#define SOR_REFCLK_DIV_FRAC(x) (((x) & 0x3) << 6)
@ -378,10 +394,62 @@
#define SOR_INPUT_CONTROL_ARM_VIDEO_RANGE_LIMITED (1 << 1)
#define SOR_INPUT_CONTROL_HDMI_SRC_SELECT(x) (((x) & 0x1) << 0)
#define SOR_AUDIO_CNTRL 0xfc
#define SOR_AUDIO_CNTRL_INJECT_NULLSMPL (1 << 29)
#define SOR_AUDIO_CNTRL_SOURCE_SELECT(x) (((x) & 0x3) << 20)
#define SOURCE_SELECT_MASK 0x3
#define SOURCE_SELECT_HDA 0x2
#define SOURCE_SELECT_SPDIF 0x1
#define SOURCE_SELECT_AUTO 0x0
#define SOR_AUDIO_CNTRL_AFIFO_FLUSH (1 << 12)
#define SOR_AUDIO_SPARE 0xfe
#define SOR_AUDIO_SPARE_HBR_ENABLE (1 << 27)
#define SOR_AUDIO_NVAL_0320 0xff
#define SOR_AUDIO_NVAL_0441 0x100
#define SOR_AUDIO_NVAL_0882 0x101
#define SOR_AUDIO_NVAL_1764 0x102
#define SOR_AUDIO_NVAL_0480 0x103
#define SOR_AUDIO_NVAL_0960 0x104
#define SOR_AUDIO_NVAL_1920 0x105
#define SOR_AUDIO_HDA_CODEC_SCRATCH0 0x10a
#define SOR_AUDIO_HDA_CODEC_SCRATCH0_VALID (1 << 30)
#define SOR_AUDIO_HDA_CODEC_SCRATCH0_FMT_MASK 0xffff
#define SOR_AUDIO_HDA_ELD_BUFWR 0x10c
#define SOR_AUDIO_HDA_ELD_BUFWR_INDEX(x) (((x) & 0xff) << 8)
#define SOR_AUDIO_HDA_ELD_BUFWR_DATA(x) (((x) & 0xff) << 0)
#define SOR_AUDIO_HDA_PRESENSE 0x10d
#define SOR_AUDIO_HDA_PRESENSE_ELDV (1 << 1)
#define SOR_AUDIO_HDA_PRESENSE_PD (1 << 0)
#define SOR_AUDIO_AVAL_0320 0x10f
#define SOR_AUDIO_AVAL_0441 0x110
#define SOR_AUDIO_AVAL_0882 0x111
#define SOR_AUDIO_AVAL_1764 0x112
#define SOR_AUDIO_AVAL_0480 0x113
#define SOR_AUDIO_AVAL_0960 0x114
#define SOR_AUDIO_AVAL_1920 0x115
#define SOR_INT_STATUS 0x11c
#define SOR_INT_CODEC_CP_REQUEST (1 << 2)
#define SOR_INT_CODEC_SCRATCH1 (1 << 1)
#define SOR_INT_CODEC_SCRATCH0 (1 << 0)
#define SOR_INT_MASK 0x11d
#define SOR_INT_ENABLE 0x11e
#define SOR_HDMI_VSI_INFOFRAME_CTRL 0x123
#define SOR_HDMI_VSI_INFOFRAME_STATUS 0x124
#define SOR_HDMI_VSI_INFOFRAME_HEADER 0x125
#define SOR_HDMI_AUDIO_N 0x13c
#define SOR_HDMI_AUDIO_N_LOOKUP (1 << 28)
#define SOR_HDMI_AUDIO_N_RESET (1 << 20)
#define SOR_HDMI2_CTRL 0x13e
#define SOR_HDMI2_CTRL_CLOCK_MODE_DIV_BY_4 (1 << 1)
#define SOR_HDMI2_CTRL_SCRAMBLE (1 << 0)