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drm/i2c: tda998x: use irq for connection status and EDID read 

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.

The IRQ number and trigger type are defined in the i2c client either
by platform data or in the DT.

Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jean-Francois Moine 2014-01-25 18:14:38 +01:00 committed by Russell King
parent e47826274e
commit 12473b7d8e
1 changed files with 105 additions and 9 deletions
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104
drivers/gpu/drm/i2c/tda998x_drv.c
View File

@ -19,6 +19,7 @@
#include <linux/hdmi.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <sound/asoundef.h>
#include <drm/drmP.h>
@ -40,6 +41,10 @@ struct tda998x_priv {
u8 vip_cntrl_1;
u8 vip_cntrl_2;
struct tda998x_encoder_params params;
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)
@ -306,11 +311,16 @@ 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)
@ -524,6 +534,35 @@ 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_DRIVER(
"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) { /* HPD 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;
@ -994,23 +1033,36 @@ read_edid_block(struct drm_encoder *encoder, uint8_t *buf, int blk)
reg_write(priv, REG_DDC_SEGM, segptr);
/* enable reading EDID: */
priv->wq_edid_wait = 1;
reg_write(priv, REG_EDID_CTRL, 0x1);
/* flag must be cleared by sw: */
reg_write(priv, REG_EDID_CTRL, 0x0);
/* wait for block read to complete: */
for (i = 100; i > 0; i--) {
if (priv->hdmi->irq) {
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;
msleep(1);
}
}
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) {
@ -1108,7 +1160,13 @@ static int
tda998x_encoder_create_resources(struct drm_encoder *encoder,
struct drm_connector *connector)
{
DBG("");
struct tda998x_priv *priv = to_tda998x_priv(encoder);
if (priv->hdmi->irq)
connector->polled = DRM_CONNECTOR_POLL_HPD;
else
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
return 0;
}
@ -1127,6 +1185,13 @@ tda998x_encoder_destroy(struct drm_encoder *encoder)
{
struct tda998x_priv *priv = to_tda998x_priv(encoder);
drm_i2c_encoder_destroy(encoder);
/* disable all IRQs and free the IRQ handler */
cec_write(priv, REG_CEC_RXSHPDINTENA, 0);
reg_clear(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);
if (priv->hdmi->irq)
free_irq(priv->hdmi->irq, priv);
if (priv->cec)
i2c_unregister_device(priv->cec);
kfree(priv);
@ -1186,6 +1251,8 @@ tda998x_encoder_init(struct i2c_client *client,
kfree(priv);
return -ENODEV;
}
priv->encoder = &encoder_slave->base;
priv->dpms = DRM_MODE_DPMS_OFF;
encoder_slave->slave_priv = priv;
@ -1242,6 +1309,35 @@ tda998x_encoder_init(struct i2c_client *client,
cec_write(priv, REG_CEC_FRO_IM_CLK_CTRL,
CEC_FRO_IM_CLK_CTRL_GHOST_DIS | CEC_FRO_IM_CLK_CTRL_IMCLK_SEL);
/* initialize the optional IRQ */
if (client->irq) {
int irqf_trigger;
/* init read EDID waitqueue */
init_waitqueue_head(&priv->wq_edid);
/* clear pending interrupts */
reg_read(priv, REG_INT_FLAGS_0);
reg_read(priv, REG_INT_FLAGS_1);
reg_read(priv, REG_INT_FLAGS_2);
irqf_trigger =
irqd_get_trigger_type(irq_get_irq_data(client->irq));
ret = request_threaded_irq(client->irq, NULL,
tda998x_irq_thread,
irqf_trigger | IRQF_ONESHOT,
"tda998x", priv);
if (ret) {
dev_err(&client->dev,
"failed to request IRQ#%u: %d\n",
client->irq, ret);
goto fail;
}
/* enable HPD irq */
cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
}
/* enable EDID read irq: */
reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);