From: Baihan Li <[email protected]>
When using command rmmod and insmod, there is no showing in second time
insmoding. Because DP controller won't send HPD signals, if connection
doesn't change or controller isn't reset. So add reset before unreset
in hibmc_dp_hw_init().
Fixes: 3c7623fb5bb6 ("drm/hisilicon/hibmc: Enable this hot plug detect of irq
feature")
Fixes: 94ee73ee3020 ("drm/hisilicon/hibmc: add dp hw moduel in hibmc driver")
Signed-off-by: Baihan Li <[email protected]>
Signed-off-by: Yongbang Shi <[email protected]>
---
ChangeLog:
v1 -> v2:
- fix the tag, suggested by Dmitry Baryshkov.
- separate the patch, suggested by Dmitry Baryshkov.
---
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 5b1f943b601c..edb7539d830e 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
@@ -178,6 +178,8 @@ int hibmc_dp_hw_init(struct hibmc_dp *dp)
writel(0, dp_dev->base + HIBMC_DP_INTR_ENABLE);
writel(HIBMC_DP_INT_RST, dp_dev->base + HIBMC_DP_INTR_ORIGINAL_STATUS);
/* rst */
+ writel(0, dp_dev->base + HIBMC_DP_DPTX_RST_CTRL);
+ usleep_range(30, 50);
writel(HIBMC_DP_DPTX_RST, dp_dev->base + HIBMC_DP_DPTX_RST_CTRL);
/* clock enable */
writel(HIBMC_DP_CLK_EN, dp_dev->base + HIBMC_DP_DPTX_CLK_CTRL);
--
2.33.0
