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a=rsa-sha256; c=relaxed/relaxed; d=ew.tq-group.com; s=dkim; t=1738856353; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nu8m4uOlFDA+u0T99iQf2bTuV73l/D8rZBvQ030okiA=; b=B+4cb1uf7v9DiQf+qu4va01yy1IcqvGJ7kvoiQeuCCdGvCOobbBrnwmlfPcNwoYNBvMAEF i79WhgV4baWZYhM2qI4UteTdXDmrC3/CijnG6UbGAoTqcEhEE9ANoar/MTWIz7bCgydFfW Y+myR7pZ/nAcw9uFcm0sOp04ic+v/48Qo9i9B3wLLjVgUNMd8teAwIF/0p3o9dTe/Iu1lx 7qB37GZ+rWIc3UtukzA5lZO/y0drb4q8qp65uSjzaasY4KwvqyztfdG/j9beX3xt3QSb0+ nd/tGprUefNwllqhtIaYUwgfpvfnBVoZbx8jCOJcVct+4HbEL3GELBth7W+ecA== From: Alexander Stein To: Herve Codina Cc: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dave Stevenson , =?ISO-8859-1?Q?Ma=EDra?= Canal , Raspberry Pi Kernel Maintenance , Marek Vasut , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Louis Chauvet , Luca Ceresoli , Thomas Petazzoni Subject: Re: [PATCH v5 4/4] drm: bridge: ti-sn65dsi83: Add error recovery mechanism Date: Thu, 06 Feb 2025 16:39:09 +0100 Message-ID: <8756830.T7Z3S40VBb@steina-w> Organization: TQ-Systems GmbH In-Reply-To: <20250206162048.1f159ba6@bootlin.com> References: <20250203161607.223731-1-herve.codina@bootlin.com> <3605739.aeNJFYEL58@steina-w> <20250206162048.1f159ba6@bootlin.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" X-Last-TLS-Session-Version: TLSv1.3 Hi Herve, Am Donnerstag, 6. Februar 2025, 16:20:48 CET schrieb Herve Codina: > Hi Alexander, >=20 > On Thu, 06 Feb 2025 15:38:42 +0100 > Alexander Stein wrote: >=20 > ... > > With interrupt configured I got the following stack trace upon > > reboot/poweroff: > >=20 > > [ 91.317264] sn65dsi83 2-002d: reset the pipe > > [ 91.344093] Unable to handle ke > > ** replaying previous printk message ** > > [ 91.344093] Unable to handle kernel NULL pointer dereference at virt= ual address 0000000000000000 > ... >=20 > Ouch :( >=20 > One question to help me investigating: > Do you have the issue at init/probe or when you start to display graphics? This is during shutdown/poweroff. I assume that regmap_reg() in sn65dsi83_handle_errors() fails and because of that reset_work is scheduled. Best regards, Alexander =2D-=20 TQ-Systems GmbH | M=FChlstra=DFe 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht M=FCnchen, HRB 105018 Gesch=E4ftsf=FChrer: Detlef Schneider, R=FCdiger Stahl, Stefan Schneider http://www.tq-group.com/