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[109.252.156.195]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a88867f754sm664935e87.61.2026.05.06.08.02.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2026 08:02:44 -0700 (PDT) Message-ID: <7b8f06ec-dbf4-402a-a7bf-fe8227b4f8ba@gmail.com> Date: Wed, 6 May 2026 18:02:42 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/7] drm/bridge: tc358768: Long command support To: Tomi Valkeinen , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Parth Pancholi , Francesco Dolcini Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, =?UTF-8?Q?Jo=C3=A3o_Paulo_Gon=C3=A7alves?= References: <20260311-tc358768-v2-0-e75a99131bd5@ideasonboard.com> From: Dmitry Osipenko Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 06.05.2026 10:55, Tomi Valkeinen пишет: > Hi all, > > On 11/03/2026 09:48, Tomi Valkeinen wrote: >> This series makes some small improvements to the tc358768 driver, and >> then adds support for long commands, commands that have more than 8 >> bytes of payload. >> >> This has been tested on Toradex Verdin AM62 board, with a ST7703 based >> DSI panel which requires initial configuration using commands that have >> 8+ bytes. >> >> I tested the following combinations, by observing the panel visually and >> the DSI lanes with an oscilloscope: >> >> - HS command transfer, continuous clock >> - HS command transfer, non-continuous clock >> - LP command transfer, continuous clock >> - LP command transfer, non-continuous clock >> >> All except LP + continuous clock work fine. While observing the lanes >> with normal oscilloscope is a very high level and vague view of what >> exactly is going on the lanes, it still looks good to me: initial >> commands are sent in LP, and then video data is being sent in HS, and >> clock lane is continuous. However, the panel stays black, so something >> is not quite right. >> >> As it doesn't make sense to send commands in LP during initial >> configuration, especially with longer commands, I will leave that >> particular combination unresolved. I'd be interested to hear if it works >> on some other panel. >> >> Signed-off-by: Tomi Valkeinen >> --- >> Changes in v2: >> - Add reviewed-by & tested-by tags >> - Rebase on v7.0-rc2 >> - Link to v1: https://lore.kernel.org/r/20251021-tc358768-v1-0- >> d590dc6a1a0c@ideasonboard.com > Any further comments from anyone? I don't see a specific maintainer for > this bridge chip, so if there are no comments I'll push this to drm-misc > in the coming days. No objections