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Wed, 20 May 2026 02:26:40 -0700 (PDT) From: Svyatoslav Ryhel To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Svyatoslav Ryhel Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 1/1] gpu/drm: bridge: tc358768: Add delay after PLL setup Date: Wed, 20 May 2026 12:26:28 +0300 Message-ID: <20260520092628.47539-2-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260520092628.47539-1-clamor95@gmail.com> References: <20260520092628.47539-1-clamor95@gmail.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" After tc358768_setup_pll() enables PLL_CKEN and the lock indicator comes up, the DSI register sequence runs near immediately. On TF700T this results in the bridge claiming PLL lock but producing no DSI video output: the panel powers up, the backlight comes on, but the framebuffer is never scanned out. Insert a small settling delay between PLL setup and the rest of the attach. Suggested-by: Michele Brocco Tested-by: Michele Brocco # TF700T Signed-off-by: Svyatoslav Ryhel --- drivers/gpu/drm/bridge/tc358768.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc3= 58768.c index 0f2820b37302..17abb24a7181 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -824,6 +824,9 @@ static void tc358768_bridge_atomic_pre_enable(struct dr= m_bridge *bridge, return; } =20 + /* Allow the PLL to settle */ + msleep(20); + drm_display_mode_to_videomode(mode, &vm); =20 dsiclk =3D priv->dsiclk; --=20 2.51.0