| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20140125181438.1353afc7@armhf>
Date: Sat, 25 Jan 2014 18:14:38 +0100
From: Jean-Francois Moine <moinejf@...e.fr>
To: dri-devel@...ts.freedesktop.org
Cc: Dave Airlie <airlied@...il.com>, Rob Clark <robdclark@...il.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Russell King - ARM Linux <linux@....linux.org.uk>
Subject: [PATCH v4 15/24] 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 is defined in the i2c client either by platform data or
in the DT.
Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
---
drivers/gpu/drm/i2c/tda998x_drv.c | 102 ++++++++++++++++++++++++++++++++++----
1 file changed, 93 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 967f9ce..5a67b6f 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -39,6 +39,10 @@ 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)
@@ -305,11 +309,16 @@ 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)
@@ -523,6 +532,35 @@ 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;
@@ -986,23 +1024,36 @@ 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--) {
- 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->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;
+ }
}
- 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) {
@@ -1100,7 +1151,13 @@ 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;
}
@@ -1176,6 +1233,7 @@ 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;
@@ -1229,6 +1287,32 @@ 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) {
+
+ /* 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);
+
+ ret = request_threaded_irq(client->irq, NULL,
+ tda998x_irq_thread,
+ IRQF_TRIGGER_FALLING | 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);
--
1.8.5.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists