The TDA998x is a HDMI transmitter with a TDA9950 CEC engine integrated onto the same die. Add support for the TDA9950 CEC engine to the TDA998x driver.
Signed-off-by: Russell King rmk+kernel@armlinux.org.uk --- drivers/gpu/drm/i2c/Kconfig | 1 + drivers/gpu/drm/i2c/tda998x_drv.c | 209 +++++++++++++++++++++++++++++++++++--- 2 files changed, 196 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig index 3a232f5ff0a1..096d2139e733 100644 --- a/drivers/gpu/drm/i2c/Kconfig +++ b/drivers/gpu/drm/i2c/Kconfig @@ -22,6 +22,7 @@ config DRM_I2C_SIL164 config DRM_I2C_NXP_TDA998X tristate "NXP Semiconductors TDA998X HDMI encoder" default m if DRM_TILCDC + select CEC_NOTIFIER select SND_SOC_HDMI_CODEC if SND_SOC help Support for NXP Semiconductors TDA998X HDMI encoders. diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index e294f5b50236..3ad39d018ab6 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -16,8 +16,10 @@ */
#include <linux/component.h> +#include <linux/gpio/consumer.h> #include <linux/hdmi.h> #include <linux/module.h> +#include <linux/platform_data/tda9950.h> #include <linux/irq.h> #include <sound/asoundef.h> #include <sound/hdmi-codec.h> @@ -29,6 +31,8 @@ #include <drm/drm_of.h> #include <drm/i2c/tda998x.h>
+#include <media/cec-notifier.h> + #define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
struct tda998x_audio_port { @@ -55,6 +59,7 @@ struct tda998x_priv { struct platform_device *audio_pdev; struct mutex audio_mutex;
+ struct mutex edid_mutex; wait_queue_head_t wq_edid; volatile int wq_edid_wait;
@@ -67,6 +72,9 @@ struct tda998x_priv { struct drm_connector connector;
struct tda998x_audio_port audio_port[2]; + struct tda9950_glue cec_glue; + struct gpio_desc *calib; + struct cec_notifier *cec_notify; };
#define conn_to_tda998x_priv(x) \ @@ -345,6 +353,12 @@ struct tda998x_priv { #define REG_CEC_INTSTATUS 0xee /* read */ # define CEC_INTSTATUS_CEC (1 << 0) # define CEC_INTSTATUS_HDMI (1 << 1) +#define REG_CEC_CAL_XOSC_CTRL1 0xf2 +# define CEC_CAL_XOSC_CTRL1_ENA_CAL BIT(0) +#define REG_CEC_DES_FREQ2 0xf5 +# define CEC_DES_FREQ2_DIS_AUTOCAL BIT(7) +#define REG_CEC_CLK 0xf6 +# define CEC_CLK_FRO 0x11 #define REG_CEC_FRO_IM_CLK_CTRL 0xfb /* read/write */ # define CEC_FRO_IM_CLK_CTRL_GHOST_DIS (1 << 7) # define CEC_FRO_IM_CLK_CTRL_ENA_OTP (1 << 6) @@ -359,6 +373,7 @@ struct tda998x_priv { # define CEC_RXSHPDLEV_HPD (1 << 1)
#define REG_CEC_ENAMODS 0xff /* read/write */ +# define CEC_ENAMODS_EN_CEC_CLK (1 << 7) # define CEC_ENAMODS_DIS_FRO (1 << 6) # define CEC_ENAMODS_DIS_CCLK (1 << 5) # define CEC_ENAMODS_EN_RXSENS (1 << 2) @@ -417,6 +432,114 @@ cec_read(struct tda998x_priv *priv, u8 addr) return val; }
+static void cec_enamods(struct tda998x_priv *priv, u8 mods, bool enable) +{ + int val = cec_read(priv, REG_CEC_ENAMODS); + + if (val < 0) + return; + + if (enable) + val |= mods; + else + val &= ~mods; + + cec_write(priv, REG_CEC_ENAMODS, val); +} + +static void tda998x_cec_set_calibration(struct tda998x_priv *priv, bool enable) +{ + if (enable) { + u8 val; + + cec_write(priv, 0xf3, 0xc0); + cec_write(priv, 0xf4, 0xd4); + + /* Enable automatic calibration mode */ + val = cec_read(priv, REG_CEC_DES_FREQ2); + val &= ~CEC_DES_FREQ2_DIS_AUTOCAL; + cec_write(priv, REG_CEC_DES_FREQ2, val); + + /* Enable free running oscillator */ + cec_write(priv, REG_CEC_CLK, CEC_CLK_FRO); + cec_enamods(priv, CEC_ENAMODS_DIS_FRO, false); + + cec_write(priv, REG_CEC_CAL_XOSC_CTRL1, + CEC_CAL_XOSC_CTRL1_ENA_CAL); + } else { + cec_write(priv, REG_CEC_CAL_XOSC_CTRL1, 0); + } +} + +/* + * Calibration for the internal oscillator: we need to set calibration mode, + * and then pulse the IRQ line low for a 10ms ± 1% period. + */ +static void tda998x_cec_calibration(struct tda998x_priv *priv) +{ + struct gpio_desc *calib = priv->calib; + + mutex_lock(&priv->edid_mutex); + if (priv->hdmi->irq > 0) + disable_irq(priv->hdmi->irq); + gpiod_direction_output(calib, 1); + tda998x_cec_set_calibration(priv, true); + + local_irq_disable(); + gpiod_set_value(calib, 0); + mdelay(10); + gpiod_set_value(calib, 1); + local_irq_enable(); + + tda998x_cec_set_calibration(priv, false); + gpiod_direction_input(calib); + if (priv->hdmi->irq > 0) + enable_irq(priv->hdmi->irq); + mutex_unlock(&priv->edid_mutex); +} + +static int tda998x_cec_hook_init(void *data) +{ + struct tda998x_priv *priv = data; + struct gpio_desc *calib; + + calib = gpiod_get(&priv->hdmi->dev, "nxp,calib", GPIOD_ASIS); + if (IS_ERR(calib)) { + dev_warn(&priv->hdmi->dev, "failed to get calibration gpio: %ld\n", + PTR_ERR(calib)); + return PTR_ERR(calib); + } + + priv->calib = calib; + + return 0; +} + +static void tda998x_cec_hook_exit(void *data) +{ + struct tda998x_priv *priv = data; + + gpiod_put(priv->calib); + priv->calib = NULL; +} + +static int tda998x_cec_hook_open(void *data) +{ + struct tda998x_priv *priv = data; + + cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, true); + tda998x_cec_calibration(priv); + + return 0; +} + +static void tda998x_cec_hook_release(void *data) +{ + struct tda998x_priv *priv = data; + + cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, false); +} + static int set_page(struct tda998x_priv *priv, u16 reg) { @@ -657,10 +780,13 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data) sta, cec, lvl, flag0, flag1, flag2);
if (cec & CEC_RXSHPDINT_HPD) { - if (lvl & CEC_RXSHPDLEV_HPD) + if (lvl & CEC_RXSHPDLEV_HPD) { tda998x_edid_delay_start(priv); - else + } else { schedule_work(&priv->detect_work); + cec_notifier_set_phys_addr(priv->cec_notify, + CEC_PHYS_ADDR_INVALID); + }
handled = true; } @@ -981,6 +1107,8 @@ static int tda998x_connector_fill_modes(struct drm_connector *connector, if (connector->edid_blob_ptr) { struct edid *edid = (void *)connector->edid_blob_ptr->data;
+ cec_notifier_set_phys_addr_from_edid(priv->cec_notify, edid); + priv->sink_has_audio = drm_detect_monitor_audio(edid); } else { priv->sink_has_audio = false; @@ -1024,6 +1152,8 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length) offset = (blk & 1) ? 128 : 0; segptr = blk / 2;
+ mutex_lock(&priv->edid_mutex); + reg_write(priv, REG_DDC_ADDR, 0xa0); reg_write(priv, REG_DDC_OFFS, offset); reg_write(priv, REG_DDC_SEGM_ADDR, 0x60); @@ -1043,14 +1173,15 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length) msecs_to_jiffies(100)); if (i < 0) { dev_err(&priv->hdmi->dev, "read edid wait err %d\n", i); - return i; + ret = i; + goto failed; } } else { for (i = 100; i > 0; i--) { msleep(1); ret = reg_read(priv, REG_INT_FLAGS_2); if (ret < 0) - return ret; + goto failed; if (ret & INT_FLAGS_2_EDID_BLK_RD) break; } @@ -1058,17 +1189,22 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
if (i == 0) { dev_err(&priv->hdmi->dev, "read edid timeout\n"); - return -ETIMEDOUT; + ret = -ETIMEDOUT; + goto failed; }
ret = reg_read_range(priv, REG_EDID_DATA_0, buf, length); if (ret != length) { dev_err(&priv->hdmi->dev, "failed to read edid block %d: %d\n", blk, ret); - return ret; + goto failed; }
- return 0; + ret = 0; + + failed: + mutex_unlock(&priv->edid_mutex); + return ret; }
static int tda998x_connector_get_modes(struct drm_connector *connector) @@ -1424,6 +1560,9 @@ static void tda998x_destroy(struct tda998x_priv *priv) cancel_work_sync(&priv->detect_work);
i2c_unregister_device(priv->cec); + + if (priv->cec_notify) + cec_notifier_put(priv->cec_notify); }
/* I2C driver functions */ @@ -1473,11 +1612,13 @@ static int tda998x_get_audio_ports(struct tda998x_priv *priv, static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv) { struct device_node *np = client->dev.of_node; + struct i2c_board_info cec_info; u32 video; int rev_lo, rev_hi, ret;
mutex_init(&priv->mutex); /* protect the page access */ mutex_init(&priv->audio_mutex); /* protect access from audio thread */ + mutex_init(&priv->edid_mutex); init_waitqueue_head(&priv->edid_delay_waitq); timer_setup(&priv->edid_delay_timer, tda998x_edid_delay_done, 0); INIT_WORK(&priv->detect_work, tda998x_detect_work); @@ -1556,11 +1697,8 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv) reg_read(priv, REG_INT_FLAGS_1); reg_read(priv, REG_INT_FLAGS_2);
- /* initialize the optional IRQ */ - priv->cec = i2c_new_dummy(client->adapter, priv->cec_addr); - if (!priv->cec) - return -ENODEV;
+ /* initialize the optional IRQ */ if (client->irq) { unsigned long irq_flags;
@@ -1569,6 +1707,9 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
irq_flags = irqd_get_trigger_type(irq_get_irq_data(client->irq)); + + priv->cec_glue.irq_flags = irq_flags; + irq_flags |= IRQF_SHARED | IRQF_ONESHOT; ret = request_threaded_irq(client->irq, NULL, tda998x_irq_thread, irq_flags, @@ -1577,13 +1718,46 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv) dev_err(&client->dev, "failed to request IRQ#%u: %d\n", client->irq, ret); - goto err_irq; + return ret; }
/* enable HPD irq */ cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD); }
+ priv->cec_notify = cec_notifier_get(&client->dev); + if (!priv->cec_notify) { + ret = -ENOMEM; + goto fail; + } + + priv->cec_glue.parent = &client->dev; + priv->cec_glue.data = priv; + priv->cec_glue.init = tda998x_cec_hook_init; + priv->cec_glue.exit = tda998x_cec_hook_exit; + priv->cec_glue.open = tda998x_cec_hook_open; + priv->cec_glue.release = tda998x_cec_hook_release; + + /* + * Some TDA998x are actually two I2C devices merged onto one piece + * of silicon: TDA9989 and TDA19989 combine the HDMI transmitter + * with a slightly modified TDA9950 CEC device. The CEC device + * is at the TDA9950 address, with the address pins strapped across + * to the TDA998x address pins. Hence, it always has the same + * offset. + */ + memset(&cec_info, 0, sizeof(cec_info)); + strlcpy(cec_info.type, "tda9950", sizeof(cec_info.type)); + cec_info.addr = priv->cec_addr; + cec_info.platform_data = &priv->cec_glue; + cec_info.irq = client->irq; + + priv->cec = i2c_new_device(client->adapter, &cec_info); + if (!priv->cec) { + free_irq(priv->hdmi->irq, priv); + return -ENODEV; + } + /* enable EDID read irq: */ reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
@@ -1610,8 +1784,15 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv) err_audio: if (client->irq) free_irq(client->irq, priv); -err_irq: - i2c_unregister_device(priv->cec); +fail: + /* if encoder_init fails, the encoder slave is never registered, + * so cleanup here: + */ + if (priv->cec) + i2c_unregister_device(priv->cec); + if (priv->cec_notify) + cec_notifier_put(priv->cec_notify); + free_irq(priv->hdmi->irq, priv); return ret; }