FAILED: patch "[PATCH] drm/i915: Increase LSPCON timeout" failed to apply to 4.14-stable tree

FAILED: patch "[PATCH] drm/i915: Increase LSPCON timeout" failed to apply to 4.14-stable tree

[gregkh]

The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 299c2a904b1e8d5096d4813df6371357d97a6cd1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20Sch=C3=B6n?= <fredrikschon@gmail.com>
Date: Fri, 17 Aug 2018 22:07:28 +0200
Subject: [PATCH] drm/i915: Increase LSPCON timeout
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

100 ms is not enough time for the LSPCON adapter on Intel NUC devices to
settle. This causes dropped display modes at boot or screen reconfiguration.
Empirical testing can reproduce the error up to a timeout of 190 ms. Basic
boot and stress testing at 200 ms has not (yet) failed.

Increase timeout to 400 ms to get some margin of error.

Changes from v1:
The initial suggestion of 1000 ms was lowered due to concerns about delaying
valid timeout cases.
Update patch metadata.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107503
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1570392
Fixes: 357c0ae9198a ("drm/i915/lspcon: Wait for expected LSPCON mode to settle")
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: <stable@vger.kernel.org> # v4.11+
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Fredrik Schön <fredrik.schon@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180817200728.8154-1-fredrik.schon@gmail.com
(cherry picked from commit 59f1c8ab30d6f9042562949f42cbd3f3cf69de94)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index 5dae16ccd9f1..3e085c5f2b81 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -74,7 +74,7 @@ static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
 	DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
 		      lspcon_mode_name(mode));
 
-	wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 100);
+	wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400);
 	if (current_mode != mode)
 		DRM_ERROR("LSPCON mode hasn't settled\n");
 

Re: FAILED: patch "[PATCH] drm/i915: Increase LSPCON timeout" failed to apply to 4.14-stable tree

[Fredrik Schön]

ons 2018-09-12 klockan 10:49 +0200 skrev gregkh@linuxfoundation.org:
> > The patch below does not apply to the 4.14-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> > 
> > thanks,
> > 
> > greg k-h

Updated patch attached. Build and boot tested. 

Mainline commit id is 299c2a904b1e8d5096d4813df6371357d97a6cd1

Regards,
Fredrik

---

>From f371bbae4541047a1ee34f11f25bc15e864df625 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fredrik=20Sch=C3=B6n?= <fredrik.schon@gmail.com>
Date: Wed, 12 Sep 2018 20:43:42 +0200
Subject: [PATCH] drm/i915: Increase LSPCON timeout
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

100 ms is not enough time for the LSPCON adapter on Intel NUC devices to
settle. This causes dropped display modes at boot or screen
reconfiguration. Empirical testing can reproduce the error up to a timeout
of 190 ms. Basic boot and stress testing at 200 ms has not (yet) failed.

Increase timeout to 400 ms to get some margin of error.

Backported to 4.14-stable

Changes from v1:
The initial suggestion of 1000 ms was lowered due to concerns about delaying
valid timeout cases.
Update patch metadata.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107503
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1570392
Fixes: 357c0ae9198a ("drm/i915/lspcon: Wait for expected LSPCON mode to settle")
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: <stable@vger.kernel.org> # v4.11+
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Fredrik Schön <fredrik.schon@gmail.com>
---
 drivers/gpu/drm/i915/intel_lspcon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index beb9baaf2f2e..f71fef10ecc6 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -75,7 +75,7 @@ static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
 		      lspcon_mode_name(mode));
 
 	wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode ||
-		 current_mode == DRM_LSPCON_MODE_INVALID, 100);
+                current_mode == DRM_LSPCON_MODE_INVALID, 400);
 	if (current_mode != mode)
 		DRM_DEBUG_KMS("LSPCON mode hasn't settled\n");
 
-- 
2.17.1

Re: FAILED: patch "[PATCH] drm/i915: Increase LSPCON timeout" failed to apply to 4.14-stable tree

[Greg KH]

On Wed, Sep 12, 2018 at 09:25:55PM +0200, Fredrik Sch�n wrote:
> ons 2018-09-12 klockan 10:49 +0200 skrev gregkh@linuxfoundation.org:
> > > The patch below does not apply to the 4.14-stable tree.
> > > If someone wants it applied there, or to any other stable or longterm
> > > tree, then please email the backport, including the original git commit
> > > id to <stable@vger.kernel.org>.
> > > 
> > > thanks,
> > > 
> > > greg k-h
> 
> Updated patch attached. Build and boot tested. 
> 
> Mainline commit id is 299c2a904b1e8d5096d4813df6371357d97a6cd1

Now queued up, thanks.

greg k-h

Re: FAILED: patch "[PATCH] drm/i915: Increase LSPCON timeout" failed to apply to 4.14-stable tree

[Jani Nikula]

On Wed, 12 Sep 2018, Fredrik Schön <fredrikschon@gmail.com> wrote:
> ons 2018-09-12 klockan 10:49 +0200 skrev gregkh@linuxfoundation.org:
>> > The patch below does not apply to the 4.14-stable tree.
>> > If someone wants it applied there, or to any other stable or longterm
>> > tree, then please email the backport, including the original git commit
>> > id to <stable@vger.kernel.org>.
>> > 
>> > thanks,
>> > 
>> > greg k-h
>
> Updated patch attached. Build and boot tested. 

Fredrik, thanks for the backport!

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center