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drm: xlnx: zynqmp: release reset to DP controller before accessing DP registers

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When insmod zynqmp-dpsub.ko after rmmod it, system will hang with the
error log as below:

root@xilinx-zynqmp:~# insmod zynqmp-dpsub.ko
[   88.391289] [drm] Initialized zynqmp-dpsub 1.0.0 20130509 for fd4a0000.display on minor 0
[   88.529906] Console: switching to colour frame buffer device 128x48
[   88.549402] zynqmp-dpsub fd4a0000.display: [drm] fb0: zynqmp-dpsubdrm frame buffer device
[   88.571624] zynqmp-dpsub fd4a0000.display: ZynqMP DisplayPort Subsystem driver probed
root@xilinx-zynqmp:~# rmmod zynqmp_dpsub
[   94.023404] Console: switching to colour dummy device 80x25
root@xilinx-zynqmp:~# insmod zynqmp-dpsub.ko
	<hang here>

This is because that in zynqmp_dp_probe it tries to access some DP
registers while the DP controller is still in the reset state. When
running "rmmod zynqmp_dpsub", zynqmp_dp_reset(dp, true) in
zynqmp_dp_phy_exit is called to force the DP controller into the reset
state. Then insmod will call zynqmp_dp_probe to program the DP registers,
but at this moment the DP controller hasn't been brought out of the reset
state yet since the function zynqmp_dp_reset(dp, false) is called later and
this will result the system hang.

Releasing the reset to DP controller before any read/write operation to it
will fix this issue. And for symmetry, move zynqmp_dp_reset() call from
zynqmp_dp_phy_exit() to zynqmp_dp_remove().

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Quanyang Wang 2021-03-23 10:55:01 +08:00 committed by Laurent Pinchart
parent 97271c7ee1
commit a338619bd7
1 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/gpu/drm/xlnx/zynqmp_dp.c
View File

@ -402,10 +402,6 @@ static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
}
}
ret = zynqmp_dp_reset(dp, false);
if (ret < 0)
return ret;
zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
/*
@ -441,8 +437,6 @@ static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
ret);
}
zynqmp_dp_reset(dp, true);
for (i = 0; i < dp->num_lanes; i++) {
ret = phy_exit(dp->phy[i]);
if (ret)
@ -1683,9 +1677,13 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
return PTR_ERR(dp->reset);
}
ret = zynqmp_dp_reset(dp, false);
if (ret < 0)
return ret;
ret = zynqmp_dp_phy_probe(dp);
if (ret)
return ret;
goto err_reset;
/* Initialize the hardware. */
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
@ -1697,7 +1695,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
ret = zynqmp_dp_phy_init(dp);
if (ret)
return ret;
goto err_reset;
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
@ -1709,15 +1707,18 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
zynqmp_dp_irq_handler, IRQF_ONESHOT,
dev_name(dp->dev), dp);
if (ret < 0)
goto error;
goto err_phy_exit;
dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
dp->num_lanes);
return 0;
error:
err_phy_exit:
zynqmp_dp_phy_exit(dp);
err_reset:
zynqmp_dp_reset(dp, true);
return ret;
}
@ -1735,4 +1736,5 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
zynqmp_dp_phy_exit(dp);
zynqmp_dp_reset(dp, true);
}