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Mon, 30 Mar 2026 03:44:53 -0700 (PDT) From: Biju X-Google-Original-From: Biju To: Biju Das , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: Chris Brandt , Laurent Pinchart , Sam Ravnborg , dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , Biju Das , stable@vger.kernel.org Subject: [PATCH v3 2/3] drm: renesas: rzg2l_mipi_dsi: Increase reset deassertion delay Date: Mon, 30 Mar 2026 11:44:45 +0100 Message-ID: <20260330104450.128512-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260330104450.128512-1-biju.das.jz@bp.renesas.com> References: <20260330104450.128512-1-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Biju Das 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 Signed-off-by: Biju Das --- v2->v3: * Moved the patch from patch#4 to patch#2. * Added fixes tag. * Updated commit description. v1->v2: * Updated commit header and description. --- drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/d= rm/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_d= si *dsi, if (ret < 0) return ret; =20 - udelay(1); + fsleep(1000); =20 return 0; } --=20 2.43.0