From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.194.8.81 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794555426; b=VmQRkx0zBeoaueCOF0vcbH/S2bQBy2a3Yu2cyCTGRGpg8lEfCrwLPCv8HGPTChOXvwDb uZ8JhE0owvBQ0sEdoeMl95GUd4HsxBfBN0W1+tmMUqkxnR6MnIYCRweGuuHNt/Ju7zA16 cEjk8eBhD+IYsLHDAaDkZAiPdnWdJ4id+jW5rReI8NADBZ+ksdFlDW9ETFofWp9c1sO5y NlBc7tpxLeEHSdw34nZXf8+WGO8tqsnuIcYXeyLX4ZLbUAw8aRELLK7dIiJ7BS0g5ogsk MReBUf4cYR3moeeSLpAkOJahtx6wLSSnPGRzVYs0r++SWvtBudkKpdGEVx21H8mjscQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794555426; h=DMARC-Filter:Received:DKIM-Signature:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To; bh=0wAF9gvvBWx1jBLOo+W6S6m0Glsi4Cju2u7ogWxYQkc=; b=S9PhU9s3A4SOCj4kkNWn2OxCfRrf/+Sxi0uIeqQf5nGCkQRfA3eWzvR3O84DS9NgY82f 63fZgmaHqUuIy511r/GKJhblc7Ub2QIhCgJkYgAbzhcWZIvYISM3xCXSUMcD6AmFKi3gw KQdcxiC+TzbSHixgAQfRlt4jxsM7lDNY8aOB0qP84Tke9BSBQiVFYPaz4HruDtr0LIfQo dpbUdRoiNrH+IAtsMsZFNgOsI1vTlPKAzDgfZjdhsc5es1H3xV4Gz4feR7krwKNfh/2oQ dkHBdB5Bg8geotTpqeqF+Y4OjlzrVNp9dFPfyWCk4bHFBXJESKhSOh2Vqa9v3Ah5oxw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass header.d=dolcini.it header.i=@dolcini.it header.a=rsa-sha256 header.s=default header.b="uO/ZtZAK"; arc=none smtp.remote-ip=217.194.8.81 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CA09606A331 for ; Fri, 13 Nov 2026 07:37:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 9CA09606A331 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=dolcini.it header.i=@dolcini.it header.a=rsa-sha256 header.s=default header.b=uO/ZtZAK Received: from francesco-nb (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 0443E227AD; Fri, 13 Nov 2026 08:37:01 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1794555422; bh=0wAF9gvvBWx1jBLOo+W6S6m0Glsi4Cju2u7ogWxYQkc=; h=From:To:Subject; b=uO/ZtZAKe0L/kT/fAoWLX5CgvgoYVxSwh75/juB0sCRQ2IJfOAyc49h+sQqsY9WBe 4ukCa+fAVSysiZZ1zlKhBthMHEH2ykAu7TmJtn+ZEF8aMTzdAFcel2QExUNQUhmQaF WPoMGX0LGWAS0bH9lZffpHexai8IAimYrHGfcjLSuIkfxNilKwhS0F68zsgi//7sTY zIj5HbJ2kGDlbxOzfbhRhXU5xZWznDH/SNQ9bApmxYDiJPTpGnEoYw2RPLYuYiAOQu Dalz5nWb94nv40Puttwx5Bi7Ax2agrG8pcTOKxD1HdFzCjUS8BgVEmiHBorxXp9SUQ ShEIcrvtShoqQ== Date: Fri, 13 Nov 2026 08:36:58 +0100 From: Francesco Dolcini To: Ernest Van Hoecke , regressions@lists.linux.dev, Luca Ceresoli Cc: Francesco Dolcini , tessolveupstream@gmail.com, andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, marex@denx.de, valentin@compulab.co.il, philippe.schenker@toradex.com, alexander.stein@ew.tq-group.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/1] drm: bridge: ti-sn65dsi83: Fix DSI mode flags for stable LVDS output Message-ID: <20261113073658.GA12065@francesco-nb> References: <60a24977-b181-40e4-bcf6-38b65af293e2@gmail.com> <1716be56-ac43-440b-a5df-58cbf571ba95@gmail.com> <3hfae2i2i2toxbo7hg2if6pztaswgnfj65xfm2c4ofljc6jhua@slaqoewn4mxq> <20261024095405.GA5692@francesco-nb> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: +regression list Hello all, On Thu, Oct 29, 2026 at 04:50:39PM +0100, Ernest Van Hoecke wrote: > On Sat, Oct 24, 2026 at 11:54:05AM +0200, Francesco Dolcini wrote: > > On Wed, Sep 09, 2026 at 03:30:53PM +0200, Luca Ceresoli wrote: > > > On Fri Sep 4, 2026 at 2:02 PM CEST, Ernest Van Hoecke wrote: > > > >> > Also, from our testing, when using: > > > >> > > > > >> > dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | > > > >> > MIPI_DSI_MODE_VIDEO_NO_HSA | MIPI_DSI_MODE_NO_EOT_PACKET; > > > >> > > > > >> > we are not able to get display output. > > > >> > > > >> This is the case for the panel I worked on as well. In the practice we both > > > >> observe that non-burst mode is what fixes the panel, but there is no clear > > > >> explanation of the reason in the docs (that's what I hope to discover from > > > >> TI). > > > >> > > > > I am testing a DSI panel on our Verdin iMX8MP module, and noticed that > > > > this caused a regression. > > > > [...] > > > > > > I think we'll need to either revert this and later apply both together > > > > when ready, or apply the second patch now as well. Right now, it broke > > > > the DSI panel behind a TI sn65dsi83 bridge on v7.3-rc1. > > > > > > Reverting is surely the last resort. If you can answer the above questions > > > it would be good, maybe we find out reverting is not necessary, and worst > > > case we'll revert with better understanding on what went wrong, and maybe > > > come up with a new fix that doesn't regress. > > > > What's the status of this regression? > > I still need to test and look into this, that will happen either in > December as I'm off in November, or by someone else in the team. Sorry > for the delay. Luca: I think we should revert this for the moment, the regression is real, and I do not see an immediate way forward. #regzbot ^introduced: 4af021a97773 #regzbot title: drm: bridge: ti-sn65dsi83: display broken on Verdin iMX8MP after enabling HFP/HBP #regzbot link: https://lore.kernel.org/all/3hfae2i2i2toxbo7hg2if6pztaswgnfj65xfm2c4ofljc6jhua@slaqoewn4mxq/ Francesco