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

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Message-ID: <20240206031857.113981-1-kuro.chung@ite.com.tw>
Date: Tue, 6 Feb 2024 11:18:56 +0800
From: kuro chung <kuro.chung@....com.tw>
To:
CC: Allen Chen <allen.chen@....com.tw>, Pin-yen Lin <treapking@...omium.org>,
        Kuro Chung <kuro.chung@....com.tw>,
        Kenneth Hung <kenneth.hung@....com.tw>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong
	<narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent
 Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman
	<jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVERS"
	<dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH] UPSTREAM: drm/bridge: it6505: fix hibernate to resume no display issue

From: allen chen <allen.chen@....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