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a=rsa-sha256; c=relaxed/relaxed; d=ew.tq-group.com; s=dkim; t=1739184135; 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=Jezc0BOJMNbqLUIuH2UXMgYuq2vdFgE3MRadiK4vpW0=; b=TxR+X0NjzptiTuYA3Za9xKvwbimpIESwrfFoAcIItEBm/2E0rxZpubt82EPZgta66DWHBc BiewKr1CqmlbXHZFpY9McZHer3wylTAC2ONJkubkVhHPNO1FTKjlVVJZCQ4WZ6EitNkzi6 xKC+XuF08cfTpWv0vtUXUW2TkEUw5z1VWSDIUEGH+XMpQXC1EohKmdm6S9qiuy9gboJXUJ kxJhBhpiLy0VnXdIMfg/81DYSlZ+BLdfiDr5P3fWKMrux3Wg+KOvsL/3UgqFDSmo96CzDP 7M00wQZh1zZat3sH3dTTW6lXSOalQPNdyMsvsuX8aZGo+YmeJqzFQj9HbmbJfA== 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: Mon, 10 Feb 2025 11:42:09 +0100 Message-ID: <6136272.lOV4Wx5bFT@steina-w> Organization: TQ-Systems GmbH In-Reply-To: <20250207190816.2002d313@bootlin.com> References: <20250203161607.223731-1-herve.codina@bootlin.com> <8756830.T7Z3S40VBb@steina-w> <20250207190816.2002d313@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 Freitag, 7. Februar 2025, 19:08:16 CET schrieb Herve Codina: > Hi Alexander, >=20 > On Thu, 06 Feb 2025 16:39:09 +0100 > Alexander Stein wrote: >=20 > > Hi Herve, > >=20 > > 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 > > > ... =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 = virtual address 0000000000000000 =20 > > > ... > > >=20 > > > Ouch :( > > >=20 > > > One question to help me investigating: > > > Do you have the issue at init/probe or when you start to display grap= hics? =20 > >=20 > > This is during shutdown/poweroff. I assume that regmap_reg() in > > sn65dsi83_handle_errors() fails and because of that reset_work is sched= uled. > >=20 >=20 > Found the issue. >=20 > Can you give me following information so that I can validate what I > understood: > - Is your interrupt line connected directly to the SoC? No, unfortunately not. It's connected to a GPIO expander, which in turn delivers an IRQ to the SoC. In between the bridge and the expander is a buffer for voltage switch (1V8 -> 3V3). > - Is there any pullup/pulldown on your interrupt line? As far a I can tell, there is no pullup/pulldown on the IRQ line to the buffer. > - In your devicetree what is the configuration used for this interrupt = in > terms of level or edge. As this line is connected to an expander (pca9555) only edge triggered interrupts are supported. > Anyway, I will send a fix in the next iteration. Thanks for digging into this. 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/