[PATCH v3 6/7] drm/i2c: tda998x: add CEC support
Hans Verkuil
hverkuil at xs4all.nl
Tue Apr 24 09:27:23 UTC 2018
On 04/09/18 14:16, Russell King wrote:
> 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 at armlinux.org.uk>
Reviewed-by: Hans Verkuil <hans.verkuil at cisco.com>
Regards,
Hans
> ---
> drivers/gpu/drm/i2c/Kconfig | 1 +
> drivers/gpu/drm/i2c/tda998x_drv.c | 195 ++++++++++++++++++++++++++++++++++++--
> 2 files changed, 187 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
> index 3a232f5ff0a1..65d3acb61c03 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_CORE if 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 16e0439cad44..eb9916bd84a4 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)
> @@ -1423,6 +1559,9 @@ 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 */
> @@ -1472,11 +1611,13 @@ 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);
> @@ -1564,6 +1705,9 @@ 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,
> @@ -1579,7 +1723,34 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
> cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
> }
>
> - priv->cec = i2c_new_dummy(client->adapter, priv->cec_addr);
> + 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) {
> ret = -ENODEV;
> goto fail;
> @@ -1609,10 +1780,16 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
> return 0;
>
> 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);
> if (client->irq)
> free_irq(client->irq, priv);
> err_irq:
> - i2c_unregister_device(priv->cec);
> return ret;
> }
>
>
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