linux-kernel - [PATCH v7 drm-dp 4/4] drm/hisilicon/hibmc: Adding reset colorbar cfg in dp init.

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Message-ID: <20250923130411.2522339-5-shiyongbang@huawei.com>
Date: Tue, 23 Sep 2025 21:04:11 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<kong.kongxinwei@...ilicon.com>, <dmitry.baryshkov@....qualcomm.com>
CC: <liangjian010@...wei.com>, <chenjianmin@...wei.com>,
	<fengsheng5@...wei.com>, <shiyongbang@...wei.com>, <libaihan@...wei.com>,
	<shenjian15@...wei.com>, <shaojijie@...wei.com>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 drm-dp 4/4] drm/hisilicon/hibmc: Adding reset colorbar cfg in dp init.

From: Baihan Li <libaihan@...wei.com>

Add colorbar disable operation before reset chontroller, to make sure
colorbar status is clear in the DP init, so if rmmod the driver and the
previous colorbar configuration will not affect the next time insmod the
driver.

Fixes: 3c7623fb5bb6 ("drm/hisilicon/hibmc: Enable this hot plug detect of irq feature")
Signed-off-by: Baihan Li <libaihan@...wei.com>
Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
index 2954e3066923..b458cb7628d5 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
@@ -180,6 +180,8 @@ int hibmc_dp_hw_init(struct hibmc_dp *dp)
 	/* int init */
 	writel(0, dp_dev->base + HIBMC_DP_INTR_ENABLE);
 	writel(HIBMC_DP_INT_RST, dp_dev->base + HIBMC_DP_INTR_ORIGINAL_STATUS);
+	/* clr colorbar */
+	writel(0, dp_dev->base + HIBMC_DP_COLOR_BAR_CTRL);
 	/* rst */
 	writel(0, dp_dev->base + HIBMC_DP_DPTX_RST_CTRL);
 	usleep_range(30, 50);
-- 
2.33.0