[PATCH] UPSTREAM: drm/bridge: it6505: fix hibernate to resume no display issue

kuro chung
2024-02-06T03:08:45Z

From: allen chen <allen.chen@ite.com.tw>

Change-Id: Iaa3cd9da92a625496f579d87d0ab74ca9c4937c4
---
drivers/gpu/drm/bridge/ite-it6505.c | 42 ++++++++++++++++++++++-------
1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index b53da9bb65a1..07883001e6ca 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -1318,6 +1318,8 @@ static void it6505_video_reset(struct it6505 *it6505)
it6505_set_bits(it6505, REG_DATA_MUTE_CTRL, EN_VID_MUTE, EN_VID_MUTE);
it6505_set_bits(it6505, REG_INFOFRAME_CTRL, EN_VID_CTRL_PKT, 0x00);
it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, VIDEO_RESET);
+ it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, 0x02);
+ it6505_set_bits(it6505, REG_VID_BUS_CTRL1, TX_FIFO_RESET, 0x00);
it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, RST_501_FIFO);
it6505_set_bits(it6505, REG_501_FIFO_CTRL, RST_501_FIFO, 0x00);
it6505_set_bits(it6505, REG_RESET_CTRL, VIDEO_RESET, 0x00);
@@ -2480,10 +2482,6 @@ static void it6505_irq_video_fifo_error(struct it6505 *it6505)
struct device *dev = &it6505->client->dev;

DRM_DEV_DEBUG_DRIVER(dev, "video fifo overflow interrupt");
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
- flush_work(&it6505->link_works);
- it6505_stop_hdcp(it6505);
- it6505_video_reset(it6505);
}

static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505)
@@ -2491,10 +2489,6 @@ static void it6505_irq_io_latch_fifo_overflow(struct it6505 *it6505)
struct device *dev = &it6505->client->dev;

DRM_DEV_DEBUG_DRIVER(dev, "IO latch fifo overflow interrupt");
- it6505->auto_train_retry = AUTO_TRAIN_RETRY;
- flush_work(&it6505->link_works);
- it6505_stop_hdcp(it6505);
- it6505_video_reset(it6505);
}

static bool it6505_test_bit(unsigned int bit, const unsigned int *addr)
@@ -2522,7 +2516,7 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
{ BIT_INT_VID_FIFO_ERROR, it6505_irq_video_fifo_error },
{ BIT_INT_IO_FIFO_OVERFLOW, it6505_irq_io_latch_fifo_overflow },
};
- int int_status[3], i;
+ int int_status[3], i, reg_0d;

if (it6505->enable_drv_hold || !it6505->powered)
return IRQ_HANDLED;
@@ -2550,6 +2544,36 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data)
if (it6505_test_bit(irq_vec[i].bit, (unsigned int *)int_status))
irq_vec[i].handler(it6505);
}
+
+ if ((it6505_test_bit(irq_vec[9].bit, (unsigned int *)int_status)) ||
+ (it6505_test_bit(irq_vec[10].bit, (unsigned int *)int_status))) {
+ it6505->auto_train_retry = AUTO_TRAIN_RETRY;
+ flush_work(&it6505->link_works);
+ it6505_stop_hdcp(it6505);
+ it6505_video_reset(it6505);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "Video Error reset wait video...");
+
+ for (i = 0; i < 10; i++) {
+ usleep_range(10000, 11000);
+ int_status[2] = it6505_read(it6505, INT_STATUS_03);
+ reg_0d = it6505_read(it6505, REG_SYSTEM_STS);
+ it6505_write(it6505, INT_STATUS_03, int_status[2]);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", int_status[2]);
+ DRM_DEV_DEBUG_DRIVER(dev, "reg0D = 0x%02x", reg_0d);
+ if ((reg_0d & VIDEO_STB) && (reg_0d >= 0))
+ break;
+
+ if ((it6505_test_bit(irq_vec[9].bit, (unsigned int *)int_status)) || (it6505_test_bit(irq_vec[10].bit, (unsigned int *)int_status))) {
+ it6505_video_reset(it6505);
+ DRM_DEV_DEBUG_DRIVER(dev, "Video Error reset wait video (%d)", i);
+ }
+
+ }
+
+ }
+
}

pm_runtime_put_sync(dev);
--
2.25.1