linux-kernel - [PATCH] drm/nouveau/disp: fix DP capable DSM connectors

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Date:   Wed, 11 Oct 2023 13:41:34 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, Karol Herbst <kherbst@...hat.com>,
        stable@...r.kernel.org
Subject: [PATCH] drm/nouveau/disp: fix DP capable DSM connectors

Just special case DP DSM connectors until we properly figure out how to
deal with this.

This resolves user regressions on GPUs with such connectors without
reverting the original fix.

Cc: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org # 6.4+
Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/255
Fixes: 2b5d1c29f6c4 ("drm/nouveau/disp: PIOR DP uses GPIO for HPD, not PMGR AUX interrupts")
Signed-off-by: Karol Herbst <kherbst@...hat.com>
---
 drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
index 46b057fe1412e..3249e5c1c8930 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uconn.c
@@ -62,6 +62,18 @@ nvkm_uconn_uevent_gpio(struct nvkm_object *object, u64 token, u32 bits)
 	return object->client->event(token, &args, sizeof(args.v0));
 }
 
+static bool
+nvkm_connector_is_dp_dms(u8 type)
+{
+	switch (type) {
+	case DCB_CONNECTOR_DMS59_DP0:
+	case DCB_CONNECTOR_DMS59_DP1:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static int
 nvkm_uconn_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_uevent *uevent)
 {
@@ -101,7 +113,7 @@ nvkm_uconn_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_
 	if (args->v0.types & NVIF_CONN_EVENT_V0_UNPLUG) bits |= NVKM_GPIO_LO;
 	if (args->v0.types & NVIF_CONN_EVENT_V0_IRQ) {
 		/* TODO: support DP IRQ on ANX9805 and remove this hack. */
-		if (!outp->info.location)
+		if (!outp->info.location && !nvkm_connector_is_dp_dms(conn->info.type))
 			return -EINVAL;
 	}
 
-- 
2.41.0