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a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1757096703; 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=Gp4f3eHdfQ1nienqUYYJxpFqMyiWaotva3r4C/g2Mes=; b=qiH5lh+TWr6uM3iR1xxhdiFV8E+h2/9MT0PUmexX+VuJ8qylgADLdm7A8W7WtMI9wOgBPM vc3JFRcNlSibj3u2fceQbCspsFaR1R3a0DyD/91D3dAAcqKgOwu87FMeMMtSRJR/ogau+z E5Kw0HoWSwCupIy931AXI0XmRG5EoaruP6CAIj6JZ7kAlW+xyT3SmXs8ycIk9ZkAuSN57C 0lueYKbC5B8YYhHF6fZmdtxgPWNGtS/IKnGwchMQ6N/xYPVLb0tELJLydhwylTHR3YJbE6 zbQj2sJ/mHC8zYLx4/XnVZ75xIO4LVjAo9aoWVjR4DU4Cit2RSGP6edTTFwawQ== Date: Fri, 5 Sep 2025 20:24:58 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH v2 2/2] drm/panel: ilitek-ili9881c: Add configuration for 5" Raspberry Pi 720x1280 To: Devarsh Thakkar , Marek Vasut , dri-devel@lists.freedesktop.org Cc: Conor Dooley , Dave Stevenson , David Airlie , Jessica Zhang , Krzysztof Kozlowski , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Rob Herring , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org References: <20250904205743.186177-1-marek.vasut+renesas@mailbox.org> <20250904205743.186177-2-marek.vasut+renesas@mailbox.org> Content-Language: en-US From: Marek Vasut In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-MBO-RS-ID: 6add872de2e58f6446b X-MBO-RS-META: rcqs7mmjq3ohca6dme9cmfznm3ut8g6c X-Rspamd-Queue-Id: 4cJPsD5ym5z9tB4 On 9/5/25 3:18 PM, Devarsh Thakkar wrote: > Hi Marek, Hi, > Thanks for the patch. > > On 05/09/25 02:26, Marek Vasut wrote: >> Add configuration for the 5" Raspberry Pi 720x1280 DSI panel >> based on ili9881. This uses 10px longer horizontal sync pulse >> and 10px shorter HBP to avoid very short hsync pulse. > > Is there a publicly available datasheet for the aforementioned ilitek > controller used in the panel, also does the same document also mention > the manufacturer specific DSC commands used in rpi_5inch_init[] ? Maybe internet search engine produces some results from some display manufacturers ? > Also is there a separate document mentioning timing parameters for porch > values and sync pulse widths that you are using here for Raspberry Pi > 720x1280 DSI panel ? Nope, like most of those panel init sequences, this comes from display vendor or downstream kernel forks, in this case the rpi linux kernel fork. The timings are slightly adjusted to avoid this very narrow hsync.