[PATCH v3 04/12] media: verisilicon: Don't hold the VPU in reset after remove

[Arun Iyengar via B4 Relay <devnull+aiyengar1990.gmail.com@kernel.org>]

From: Arun Iyengar <aiyengar1990@gmail.com>

On the RK3588, the resets of the AV1 decoder include the AXI and APB
bus interface resets (SRST_A_AV1_BIU, SRST_P_AV1_BIU), which also cover
the Verisilicon IOMMU of the decoder. When the driver is unbound, the
driver core runtime resumes the device and, through the runtime PM
device link, its IOMMU. hantro_remove() then asserts the resets, and
when the IOMMU autosuspends 100 ms later, vsi_iommu_suspend() writes to
its registers while they are held in reset, which raises an SError and
panics the system:

  SError Interrupt on CPU4, code 0x00000000be000411 -- SError
  Workqueue: pm pm_runtime_work
  Call trace:
   clk_disable+0x30/0x90 (P)
   clk_bulk_disable+0x44/0x90
   vsi_iommu_suspend+0x4c/0xc8 [vsi_iommu]
   pm_generic_runtime_suspend+0x38/0x80
   genpd_runtime_suspend+0xc4/0x348
   ...
  Kernel panic - not syncing: Asynchronous SError Interrupt

Hit when reloading the module.

Commit 8e26d4c20ed2 ("media: hantro: disable runtime PM before hardware
teardown") moved the assert after the runtime PM teardown because
powering the domain off faulted on it. With the resets left asserted,
the domain is still powered on for the next bind, and off after a
failed probe, in that state.

A runtime suspended VPU has its resets deasserted and its clocks off.
Leave it in that state on remove and on the probe error path instead of
asserting the resets.

Fixes: ea71631b7129 ("media: hantro: add support for reset lines")
Cc: stable@vger.kernel.org
Signed-off-by: Arun Iyengar <aiyengar1990@gmail.com>
---
 drivers/media/platform/verisilicon/hantro_drv.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 42822b2b376c..daec9f1ea968 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -1214,7 +1214,7 @@ static int hantro_probe(struct platform_device *pdev)
 	ret = clk_bulk_prepare(vpu->variant->num_clocks, vpu->clocks);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to prepare clocks\n");
-		goto err_pm_disable_assert_reset;
+		goto err_pm_disable;
 	}
 
 	ret = v4l2_device_register(&pdev->dev, &vpu->v4l2_dev);
@@ -1268,11 +1268,6 @@ static int hantro_probe(struct platform_device *pdev)
 	v4l2_device_unregister(&vpu->v4l2_dev);
 err_clk_unprepare:
 	clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
-err_pm_disable_assert_reset:
-	pm_runtime_dont_use_autosuspend(vpu->dev);
-	pm_runtime_disable(vpu->dev);
-	reset_control_assert(vpu->resets);
-	return ret;
 err_pm_disable:
 	pm_runtime_dont_use_autosuspend(vpu->dev);
 	pm_runtime_disable(vpu->dev);
@@ -1294,7 +1289,6 @@ static void hantro_remove(struct platform_device *pdev)
 	clk_bulk_unprepare(vpu->variant->num_clocks, vpu->clocks);
 	pm_runtime_dont_use_autosuspend(vpu->dev);
 	pm_runtime_disable(vpu->dev);
-	reset_control_assert(vpu->resets);
 }
 
 static int hantro_runtime_resume(struct device *dev)

-- 
2.55.0