Re: [PATCH] drm: zynqmp_dpsub: Always register bridge

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On 26/04/2024 12:30, Laurent Pinchart wrote:
On Fri, Mar 22, 2024 at 08:01:44AM +0200, Tomi Valkeinen wrote:
On 08/03/2024 22:47, Sean Anderson wrote:
We must always register the DRM bridge, since zynqmp_dp_hpd_work_func
calls drm_bridge_hpd_notify, which in turn expects hpd_mutex to be
initialized. We do this before zynqmp_dpsub_drm_init since that calls
drm_bridge_attach. This fixes the following lockdep warning:

[   19.217084] ------------[ cut here ]------------
[   19.227530] DEBUG_LOCKS_WARN_ON(lock->magic != lock)
[   19.227768] WARNING: CPU: 0 PID: 140 at kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550
[   19.241696] Modules linked in:
[   19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 Not tainted 6.6.20+ #96
[   19.252046] Hardware name: xlnx,zynqmp (DT)
[   19.256421] Workqueue: events zynqmp_dp_hpd_work_func
[   19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   19.269104] pc : __mutex_lock+0x4bc/0x550
[   19.273364] lr : __mutex_lock+0x4bc/0x550
[   19.277592] sp : ffffffc085c5bbe0
[   19.281066] x29: ffffffc085c5bbe0 x28: 0000000000000000 x27: ffffff88009417f8
[   19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000
[   19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 0000000000000000
[   19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000
[   19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720
[   19.318922] x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001
[   19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9 : 0001ff88003f3888
[   19.334003] x8 : 0001ff88003f3888 x7 : 0000000000000000 x6 : 0000000000000000
[   19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000
[   19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880
[   19.356581] Call trace:
[   19.359160]  __mutex_lock+0x4bc/0x550
[   19.363032]  mutex_lock_nested+0x24/0x30
[   19.367187]  drm_bridge_hpd_notify+0x2c/0x6c
[   19.371698]  zynqmp_dp_hpd_work_func+0x44/0x54
[   19.376364]  process_one_work+0x3ac/0x988
[   19.380660]  worker_thread+0x398/0x694
[   19.384736]  kthread+0x1bc/0x1c0
[   19.388241]  ret_from_fork+0x10/0x20
[   19.392031] irq event stamp: 183
[   19.395450] hardirqs last  enabled at (183): [<ffffffc0800b9278>] finish_task_switch.isra.0+0xa8/0x2d4
[   19.405140] hardirqs last disabled at (182): [<ffffffc081ad3754>] __schedule+0x714/0xd04
[   19.413612] softirqs last  enabled at (114): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c
[   19.423128] softirqs last disabled at (110): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c
[   19.432614] ---[ end trace 0000000000000000 ]---

Fixes: eb2d64bfcc17 ("drm: xlnx: zynqmp_dpsub: Report HPD through the bridge")
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx>
---

   drivers/gpu/drm/xlnx/zynqmp_dpsub.c | 6 ++----
   1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
index 88eb33acd5f0..639fff2c693f 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
@@ -256,12 +256,11 @@ static int zynqmp_dpsub_probe(struct platform_device *pdev)
   	if (ret)
   		goto err_dp;
+ drm_bridge_add(dpsub->bridge);

A blank line here would be nice.

   	if (dpsub->dma_enabled) {
   		ret = zynqmp_dpsub_drm_init(dpsub);
   		if (ret)
   			goto err_disp;
-	} else {
-		drm_bridge_add(dpsub->bridge);
   	}
dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
@@ -288,9 +287,8 @@ static void zynqmp_dpsub_remove(struct platform_device *pdev)
if (dpsub->drm)
   		zynqmp_dpsub_drm_cleanup(dpsub);
-	else
-		drm_bridge_remove(dpsub->bridge);
+ drm_bridge_remove(dpsub->bridge);
   	zynqmp_disp_remove(dpsub);
   	zynqmp_dp_remove(dpsub);

I sent a similar patch:

https://lore.kernel.org/all/20240312-xilinx-dp-lock-fix-v1-1-1698f9f03bac@xxxxxxxxxxxxxxxx/

I have the drm_bridge_add() call in zynqmp_dp_probe(), as that's where
the bridge is set up, so it felt like a logical place. You add it later,
just before the bridge is used the first time.

I like mine a bit more as it has all the bridge code in the same place,
but I also wonder if there might be some risks in adding the bridge
early (before zynqmp_disp_probe()), although I can't see any issue right
away...

Seems we have the same concerns :-) I've reviewed your patch and wrote
pretty much the same. I would be more comfortable with this version,
even if I like gathering all bridge code in the same location.

I guess there's no reason to take the risk here, so I have pushed this one to drm-misc-next.

 Tomi

In any case, as this works for me too:

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>





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