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Subject: FAILED: patch "[PATCH] drm: renesas: rzg2l_mipi_dsi: Increase reset deassertion" failed to apply to 6.6-stable tree
To: biju.das.jz@bp.renesas.com,tommaso.merciai.xr@bp.renesas.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Wed, 29 Jul 2026 11:43:52 +0200
Message-ID: <2026072951-ended-spoiler-e626@gregkh>
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The patch below does not apply to the 6.6-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>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 7cbba8a8ba0219a267844d3116dbc77cecb4fcf8
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026072951-ended-spoiler-e626@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 7cbba8a8ba0219a267844d3116dbc77cecb4fcf8 Mon Sep 17 00:00:00 2001
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: Mon, 30 Mar 2026 11:44:45 +0100
Subject: [PATCH] drm: renesas: rzg2l_mipi_dsi: Increase reset deassertion
 delay

The RZ/G2L hardware manual (Rev. 1.50, May 2025), Section 34.4.2.1,
requires waiting at least 1 msec after deasserting the CMN_RSTB signal
before the DSI-Tx module is ready. Increase the delay from 1 usec to
1 msec by replacing udelay(1) with fsleep(1000) for RZ/G2L SoCs.

Fixes: 7a043f978ed1 ("drm: rcar-du: Add RZ/G2L DSI driver")
Cc: stable@vger.kernel.org
Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20260330104450.128512-3-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
index ff95cb9a7de5..9d9f77d8f949 100644
--- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c
@@ -528,7 +528,7 @@ static int rzg2l_mipi_dsi_dphy_init(struct rzg2l_mipi_dsi *dsi,
 	if (ret < 0)
 		return ret;
 
-	udelay(1);
+	fsleep(1000);
 
 	return 0;
 }