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drm/i2c: tda998x: add CEC support
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. Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King
parent
f0316f9389
commit
7e8675f000
2 changed files with 187 additions and 9 deletions
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@ -22,6 +22,7 @@ config DRM_I2C_SIL164
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config DRM_I2C_NXP_TDA998X
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tristate "NXP Semiconductors TDA998X HDMI encoder"
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default m if DRM_TILCDC
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select CEC_CORE if CEC_NOTIFIER
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select SND_SOC_HDMI_CODEC if SND_SOC
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help
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Support for NXP Semiconductors TDA998X HDMI encoders.
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@ -16,8 +16,10 @@
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*/
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#include <linux/component.h>
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#include <linux/gpio/consumer.h>
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#include <linux/hdmi.h>
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#include <linux/module.h>
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#include <linux/platform_data/tda9950.h>
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#include <linux/irq.h>
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#include <sound/asoundef.h>
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#include <sound/hdmi-codec.h>
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@ -29,6 +31,8 @@
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#include <drm/drm_of.h>
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#include <drm/i2c/tda998x.h>
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#include <media/cec-notifier.h>
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#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)
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struct tda998x_audio_port {
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@ -55,6 +59,7 @@ struct tda998x_priv {
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struct platform_device *audio_pdev;
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struct mutex audio_mutex;
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struct mutex edid_mutex;
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wait_queue_head_t wq_edid;
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volatile int wq_edid_wait;
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@ -67,6 +72,9 @@ struct tda998x_priv {
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struct drm_connector connector;
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struct tda998x_audio_port audio_port[2];
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struct tda9950_glue cec_glue;
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struct gpio_desc *calib;
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struct cec_notifier *cec_notify;
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};
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#define conn_to_tda998x_priv(x) \
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@ -345,6 +353,12 @@ struct tda998x_priv {
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#define REG_CEC_INTSTATUS 0xee /* read */
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# define CEC_INTSTATUS_CEC (1 << 0)
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# define CEC_INTSTATUS_HDMI (1 << 1)
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#define REG_CEC_CAL_XOSC_CTRL1 0xf2
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# define CEC_CAL_XOSC_CTRL1_ENA_CAL BIT(0)
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#define REG_CEC_DES_FREQ2 0xf5
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# define CEC_DES_FREQ2_DIS_AUTOCAL BIT(7)
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#define REG_CEC_CLK 0xf6
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# define CEC_CLK_FRO 0x11
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#define REG_CEC_FRO_IM_CLK_CTRL 0xfb /* read/write */
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# define CEC_FRO_IM_CLK_CTRL_GHOST_DIS (1 << 7)
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# define CEC_FRO_IM_CLK_CTRL_ENA_OTP (1 << 6)
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@ -359,6 +373,7 @@ struct tda998x_priv {
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# define CEC_RXSHPDLEV_HPD (1 << 1)
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#define REG_CEC_ENAMODS 0xff /* read/write */
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# define CEC_ENAMODS_EN_CEC_CLK (1 << 7)
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# define CEC_ENAMODS_DIS_FRO (1 << 6)
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# define CEC_ENAMODS_DIS_CCLK (1 << 5)
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# define CEC_ENAMODS_EN_RXSENS (1 << 2)
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@ -417,6 +432,114 @@ cec_read(struct tda998x_priv *priv, u8 addr)
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return val;
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}
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static void cec_enamods(struct tda998x_priv *priv, u8 mods, bool enable)
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{
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int val = cec_read(priv, REG_CEC_ENAMODS);
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if (val < 0)
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return;
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if (enable)
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val |= mods;
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else
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val &= ~mods;
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cec_write(priv, REG_CEC_ENAMODS, val);
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}
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static void tda998x_cec_set_calibration(struct tda998x_priv *priv, bool enable)
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{
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if (enable) {
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u8 val;
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cec_write(priv, 0xf3, 0xc0);
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cec_write(priv, 0xf4, 0xd4);
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/* Enable automatic calibration mode */
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val = cec_read(priv, REG_CEC_DES_FREQ2);
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val &= ~CEC_DES_FREQ2_DIS_AUTOCAL;
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cec_write(priv, REG_CEC_DES_FREQ2, val);
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/* Enable free running oscillator */
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cec_write(priv, REG_CEC_CLK, CEC_CLK_FRO);
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cec_enamods(priv, CEC_ENAMODS_DIS_FRO, false);
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cec_write(priv, REG_CEC_CAL_XOSC_CTRL1,
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CEC_CAL_XOSC_CTRL1_ENA_CAL);
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} else {
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cec_write(priv, REG_CEC_CAL_XOSC_CTRL1, 0);
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}
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}
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/*
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* Calibration for the internal oscillator: we need to set calibration mode,
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* and then pulse the IRQ line low for a 10ms ± 1% period.
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*/
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static void tda998x_cec_calibration(struct tda998x_priv *priv)
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{
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struct gpio_desc *calib = priv->calib;
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mutex_lock(&priv->edid_mutex);
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if (priv->hdmi->irq > 0)
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disable_irq(priv->hdmi->irq);
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gpiod_direction_output(calib, 1);
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tda998x_cec_set_calibration(priv, true);
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local_irq_disable();
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gpiod_set_value(calib, 0);
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mdelay(10);
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gpiod_set_value(calib, 1);
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local_irq_enable();
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tda998x_cec_set_calibration(priv, false);
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gpiod_direction_input(calib);
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if (priv->hdmi->irq > 0)
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enable_irq(priv->hdmi->irq);
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mutex_unlock(&priv->edid_mutex);
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}
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static int tda998x_cec_hook_init(void *data)
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{
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struct tda998x_priv *priv = data;
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struct gpio_desc *calib;
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calib = gpiod_get(&priv->hdmi->dev, "nxp,calib", GPIOD_ASIS);
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if (IS_ERR(calib)) {
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dev_warn(&priv->hdmi->dev, "failed to get calibration gpio: %ld\n",
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PTR_ERR(calib));
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return PTR_ERR(calib);
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}
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priv->calib = calib;
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return 0;
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}
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static void tda998x_cec_hook_exit(void *data)
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{
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struct tda998x_priv *priv = data;
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gpiod_put(priv->calib);
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priv->calib = NULL;
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}
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static int tda998x_cec_hook_open(void *data)
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{
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struct tda998x_priv *priv = data;
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cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, true);
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tda998x_cec_calibration(priv);
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return 0;
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}
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static void tda998x_cec_hook_release(void *data)
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{
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struct tda998x_priv *priv = data;
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cec_enamods(priv, CEC_ENAMODS_EN_CEC_CLK | CEC_ENAMODS_EN_CEC, false);
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}
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static int
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set_page(struct tda998x_priv *priv, u16 reg)
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{
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@ -657,10 +780,13 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
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sta, cec, lvl, flag0, flag1, flag2);
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if (cec & CEC_RXSHPDINT_HPD) {
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if (lvl & CEC_RXSHPDLEV_HPD)
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if (lvl & CEC_RXSHPDLEV_HPD) {
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tda998x_edid_delay_start(priv);
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else
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} else {
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schedule_work(&priv->detect_work);
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cec_notifier_set_phys_addr(priv->cec_notify,
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CEC_PHYS_ADDR_INVALID);
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}
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handled = true;
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}
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@ -981,6 +1107,8 @@ static int tda998x_connector_fill_modes(struct drm_connector *connector,
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if (connector->edid_blob_ptr) {
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struct edid *edid = (void *)connector->edid_blob_ptr->data;
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cec_notifier_set_phys_addr_from_edid(priv->cec_notify, edid);
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priv->sink_has_audio = drm_detect_monitor_audio(edid);
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} else {
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priv->sink_has_audio = false;
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@ -1024,6 +1152,8 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
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offset = (blk & 1) ? 128 : 0;
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segptr = blk / 2;
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mutex_lock(&priv->edid_mutex);
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reg_write(priv, REG_DDC_ADDR, 0xa0);
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reg_write(priv, REG_DDC_OFFS, offset);
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reg_write(priv, REG_DDC_SEGM_ADDR, 0x60);
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@ -1043,14 +1173,15 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
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msecs_to_jiffies(100));
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if (i < 0) {
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dev_err(&priv->hdmi->dev, "read edid wait err %d\n", i);
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return i;
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ret = i;
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goto failed;
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}
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} else {
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for (i = 100; i > 0; i--) {
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msleep(1);
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ret = reg_read(priv, REG_INT_FLAGS_2);
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if (ret < 0)
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return ret;
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goto failed;
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if (ret & INT_FLAGS_2_EDID_BLK_RD)
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break;
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}
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@ -1058,17 +1189,22 @@ static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
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if (i == 0) {
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dev_err(&priv->hdmi->dev, "read edid timeout\n");
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return -ETIMEDOUT;
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ret = -ETIMEDOUT;
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goto failed;
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}
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ret = reg_read_range(priv, REG_EDID_DATA_0, buf, length);
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if (ret != length) {
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dev_err(&priv->hdmi->dev, "failed to read edid block %d: %d\n",
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blk, ret);
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return ret;
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goto failed;
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}
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return 0;
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ret = 0;
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failed:
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mutex_unlock(&priv->edid_mutex);
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return ret;
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}
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static int tda998x_connector_get_modes(struct drm_connector *connector)
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@ -1423,6 +1559,9 @@ static void tda998x_destroy(struct tda998x_priv *priv)
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cancel_work_sync(&priv->detect_work);
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i2c_unregister_device(priv->cec);
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if (priv->cec_notify)
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cec_notifier_put(priv->cec_notify);
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}
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/* I2C driver functions */
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@ -1472,11 +1611,13 @@ static int tda998x_get_audio_ports(struct tda998x_priv *priv,
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static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
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{
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struct device_node *np = client->dev.of_node;
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struct i2c_board_info cec_info;
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u32 video;
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int rev_lo, rev_hi, ret;
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mutex_init(&priv->mutex); /* protect the page access */
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mutex_init(&priv->audio_mutex); /* protect access from audio thread */
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mutex_init(&priv->edid_mutex);
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init_waitqueue_head(&priv->edid_delay_waitq);
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timer_setup(&priv->edid_delay_timer, tda998x_edid_delay_done, 0);
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INIT_WORK(&priv->detect_work, tda998x_detect_work);
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@ -1564,6 +1705,9 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
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irq_flags =
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irqd_get_trigger_type(irq_get_irq_data(client->irq));
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priv->cec_glue.irq_flags = irq_flags;
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irq_flags |= IRQF_SHARED | IRQF_ONESHOT;
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ret = request_threaded_irq(client->irq, NULL,
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tda998x_irq_thread, irq_flags,
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@ -1579,7 +1723,34 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
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cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
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}
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priv->cec = i2c_new_dummy(client->adapter, priv->cec_addr);
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priv->cec_notify = cec_notifier_get(&client->dev);
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if (!priv->cec_notify) {
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ret = -ENOMEM;
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goto fail;
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}
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priv->cec_glue.parent = &client->dev;
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priv->cec_glue.data = priv;
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priv->cec_glue.init = tda998x_cec_hook_init;
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priv->cec_glue.exit = tda998x_cec_hook_exit;
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priv->cec_glue.open = tda998x_cec_hook_open;
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priv->cec_glue.release = tda998x_cec_hook_release;
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/*
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* Some TDA998x are actually two I2C devices merged onto one piece
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* of silicon: TDA9989 and TDA19989 combine the HDMI transmitter
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* with a slightly modified TDA9950 CEC device. The CEC device
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* is at the TDA9950 address, with the address pins strapped across
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* to the TDA998x address pins. Hence, it always has the same
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* offset.
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*/
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memset(&cec_info, 0, sizeof(cec_info));
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strlcpy(cec_info.type, "tda9950", sizeof(cec_info.type));
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cec_info.addr = priv->cec_addr;
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cec_info.platform_data = &priv->cec_glue;
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cec_info.irq = client->irq;
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priv->cec = i2c_new_device(client->adapter, &cec_info);
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if (!priv->cec) {
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ret = -ENODEV;
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goto fail;
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@ -1609,10 +1780,16 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
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return 0;
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fail:
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/* if encoder_init fails, the encoder slave is never registered,
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* so cleanup here:
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*/
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if (priv->cec)
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i2c_unregister_device(priv->cec);
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if (priv->cec_notify)
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cec_notifier_put(priv->cec_notify);
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if (client->irq)
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free_irq(client->irq, priv);
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err_irq:
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i2c_unregister_device(priv->cec);
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return ret;
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}
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