From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Mon, 7 Feb 2022 13:19:31 +0000 (+0200)
Subject: gpu: host1x: Always return syncpoint value when waiting
X-Git-Tag: accepted/tizen/unified/20230118.172025~2133
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0b92b5f4c50bce5f432485d80a1283d6b6f9b43b;p=platform%2Fkernel%2Flinux-rpi.git

gpu: host1x: Always return syncpoint value when waiting

commit 184b58fa816fb5ee1854daf0d430766422bf2a77 upstream.

The new TegraDRM UAPI uses syncpoint waiting with timeout set to
zero to indicate reading the syncpoint value. To support that we
need to return the syncpoint value always when waiting.

Fixes: 44e961381354 ("drm/tegra: Implement syncpoint wait UAPI")
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
index d198a10..a89a408 100644
--- a/drivers/gpu/host1x/syncpt.c
+++ b/drivers/gpu/host1x/syncpt.c
@@ -225,27 +225,12 @@ int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh, long timeout,
 	void *ref;
 	struct host1x_waitlist *waiter;
 	int err = 0, check_count = 0;
-	u32 val;
 
 	if (value)
-		*value = 0;
-
-	/* first check cache */
-	if (host1x_syncpt_is_expired(sp, thresh)) {
-		if (value)
-			*value = host1x_syncpt_load(sp);
+		*value = host1x_syncpt_load(sp);
 
+	if (host1x_syncpt_is_expired(sp, thresh))
 		return 0;
-	}
-
-	/* try to read from register */
-	val = host1x_hw_syncpt_load(sp->host, sp);
-	if (host1x_syncpt_is_expired(sp, thresh)) {
-		if (value)
-			*value = val;
-
-		goto done;
-	}
 
 	if (!timeout) {
 		err = -EAGAIN;