This patch adds the optional treatment of the tda998x IRQ.
The interrupt function is used to know the display connection status
without polling and to speedup reading the EDID.
Signed-off-by: Jean-Francois Moine <moin...@free.fr>
---
drivers/gpu/drm/i2c/tda998x_drv.c | 116 +++++++++++++++++++--
.../devicetree/bindings/drm/i2c/tda998x.txt | 3 +++
2 file changed, 108 insertions(+), 11 deletions(-)
diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
index f07339e1..83d7880 100644
--- a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
+++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
@@ -4,6 +4,7 @@ Required properties;
- compatible: must be "nxp,tda998x"
Optional properties:
+ - interrupts: interrupt number for HDMI exchanges - default: by polling
- video-ports: 24 bits value - default: <0x230145>
Example:
@@ -11,6 +12,8 @@ Example:
tda998x: hdmi-encoder {
compatible = "nxp,tda998x";
reg = <0x70>;
+ interrupt-parent = <&gpio0>;
+ interrupts = <27 2>; /* falling edge */
pinctrl-0 = <&pmx_camera>;
pinctrl-names = "default";
};
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c
b/drivers/gpu/drm/i2c/tda998x_drv.c
index b87802f..2187d63 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -19,6 +19,7 @@
#include <linux/hdmi.h>
#include <linux/module.h>
+#include <linux/of_irq.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
@@ -44,6 +45,11 @@ struct tda998x_priv {
u8 audio_type; /* audio type */
u8 audio_frame[6];
u32 audio_port;
+
+ int int_irq;
+ wait_queue_head_t wq_edid;
+ volatile int wq_edid_wait;
+ struct drm_encoder *encoder;
};
#define to_tda998x_priv(x) ((struct tda998x_priv
*)to_encoder_slave(x)->slave_priv)
@@ -310,11 +316,16 @@ struct tda998x_priv {
/* CEC registers: (not paged)
*/
+#define REG_CEC_INTSTATUS 0xee /* read */
+# define CEC_INTSTATUS_CEC (1 << 0)
+# define CEC_INTSTATUS_HDMI (1 << 1)
#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)
# define CEC_FRO_IM_CLK_CTRL_IMCLK_SEL (1 << 1)
# define CEC_FRO_IM_CLK_CTRL_FRO_DIV (1 << 0)
+#define REG_CEC_RXSHPDINTENA 0xfc /* read/write */
+#define REG_CEC_RXSHPDINT 0xfd /* read */
#define REG_CEC_RXSHPDLEV 0xfe /* read */
# define CEC_RXSHPDLEV_RXSENS (1 << 0)
# define CEC_RXSHPDLEV_HPD (1 << 1)
@@ -520,6 +531,34 @@ tda998x_reset(struct tda998x_priv *priv)
reg_write(priv, REG_MUX_VP_VIP_OUT, 0x24);
}
+/*
+ * only 2 interrupts may occur: screen plug/unplug and EDID read
+ */
+static irqreturn_t tda998x_irq_thread(int irq, void *data)
+{
+ struct tda998x_priv *priv = data;
+ u8 sta, cec, lvl, flag0, flag1, flag2;
+
+ if (!priv)
+ return IRQ_HANDLED;
+ sta = cec_read(priv, REG_CEC_INTSTATUS);
+ cec = cec_read(priv, REG_CEC_RXSHPDINT);
+ lvl = cec_read(priv, REG_CEC_RXSHPDLEV);
+ flag0 = reg_read(priv, REG_INT_FLAGS_0);
+ flag1 = reg_read(priv, REG_INT_FLAGS_1);
+ flag2 = reg_read(priv, REG_INT_FLAGS_2);
+ DRM_DEBUG("tda irq sta %02x cec %02x lvl %02x f0 %02x f1 %02x f2
%02x\n",
+ sta, cec, lvl, flag0, flag1, flag2);
+ if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
+ priv->wq_edid_wait = 0;
+ wake_up(&priv->wq_edid);
+ } else if (cec != 0) { /* level change */
+ if (priv->encoder && priv->encoder->dev)
+ drm_helper_hpd_irq_event(priv->encoder->dev);
+ }
+ return IRQ_HANDLED;
+}
+
static uint8_t tda998x_cksum(uint8_t *buf, size_t bytes)
{
uint8_t sum = 0;
@@ -982,7 +1021,8 @@ read_edid_block(struct drm_encoder *encoder, uint8_t *buf,
int blk)
int ret, i;
/* enable EDID read irq: */
- reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
+ if (blk == 0)
+ reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
offset = (blk & 1) ? 128 : 0;
segptr = blk / 2;
@@ -999,17 +1039,30 @@ read_edid_block(struct drm_encoder *encoder, uint8_t
*buf, int blk)
reg_write(priv, REG_EDID_CTRL, 0x0);
/* wait for block read to complete: */
- for (i = 100; i > 0; i--) {
- ret = reg_read(priv, REG_INT_FLAGS_2);
- if (ret < 0)
- return ret;
- if (ret & INT_FLAGS_2_EDID_BLK_RD)
- break;
- msleep(1);
+ if (priv->int_irq != NO_IRQ) {
+ priv->wq_edid_wait = 1;
+ i = wait_event_timeout(priv->wq_edid,
+ !priv->wq_edid_wait,
+ msecs_to_jiffies(100));
+ if (i < 0) {
+ dev_err(encoder->dev->dev, "read edid wait err %d\n",
i);
+ return i;
+ }
+ } else {
+ for (i = 10; i > 0; i--) {
+ msleep(10);
+ ret = reg_read(priv, REG_INT_FLAGS_2);
+ if (ret < 0)
+ return ret;
+ if (ret & INT_FLAGS_2_EDID_BLK_RD)
+ break;
+ }
}
- if (i == 0)
+ if (i == 0) {
+ dev_err(encoder->dev->dev, "read edid timeout\n");
return -ETIMEDOUT;
+ }
ret = reg_read_range(priv, REG_EDID_DATA_0, buf, EDID_LENGTH);
if (ret != EDID_LENGTH) {
@@ -1018,8 +1071,6 @@ read_edid_block(struct drm_encoder *encoder, uint8_t
*buf, int blk)
return ret;
}
- reg_clear(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
-
return 0;
}
@@ -1109,7 +1160,14 @@ static int
tda998x_encoder_create_resources(struct drm_encoder *encoder,
struct drm_connector *connector)
{
+ struct tda998x_priv *priv = to_tda998x_priv(encoder);
+
DBG("");
+ if (priv->int_irq != NO_IRQ)
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+ else
+ connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+ DRM_CONNECTOR_POLL_DISCONNECT;
return 0;
}
@@ -1128,6 +1186,8 @@ tda998x_encoder_destroy(struct drm_encoder *encoder)
{
struct tda998x_priv *priv = to_tda998x_priv(encoder);
drm_i2c_encoder_destroy(encoder);
+ if (priv->int_irq != NO_IRQ)
+ free_irq(priv->int_irq, priv);
if (priv->cec)
i2c_unregister_device(priv->cec);
kfree(priv);
@@ -1186,6 +1246,7 @@ tda998x_encoder_init(struct i2c_client *client,
priv->cec = i2c_new_dummy(client->adapter, 0x34);
if (!priv->cec)
return -ENODEV;
+ priv->encoder = &encoder_slave->base;
priv->dpms = DRM_MODE_DPMS_OFF;
encoder_slave->slave_priv = priv;
@@ -1250,6 +1311,39 @@ tda998x_encoder_init(struct i2c_client *client,
priv->vip_cntrl_2 = video;
}
+ /* install the optional HDMI connect IRQ */
+ priv->int_irq = irq_of_parse_and_map(np, 0);
+ if (priv->int_irq < 0)
+ priv->int_irq = NO_IRQ;
+ if (priv->int_irq != NO_IRQ) {
+
+ /* init read EDID waitqueue */
+ init_waitqueue_head(&priv->wq_edid);
+/* priv->wq_edid_wait = 0; */
+
+ /* clear pending interrupts */
+ reg_read(priv, REG_INT_FLAGS_0);
+ reg_read(priv, REG_INT_FLAGS_1);
+ reg_read(priv, REG_INT_FLAGS_2);
+
+ ret = request_threaded_irq(priv->int_irq, NULL,
+ tda998x_irq_thread,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "tda998x-int", priv);
+ if (ret) {
+ dev_err(&client->dev, "failed to request IRQ#%u: %d\n",
+ priv->int_irq, ret);
+ goto fail;
+ }
+
+ /* enable HPD irq */
+ cec_write(priv, REG_CEC_RXSHPDINTENA,
+ CEC_RXSHPDLEV_HPD | CEC_RXSHPDLEV_RXSENS);
+
+ /* treat the first irq if any */
+ msleep(10);
+ }
+
return 0;
fail:
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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