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Sat, 25 Jul 2026 13:58:29 -0700 (PDT) Message-ID: <9f2d7be0-e93e-480e-bcb1-6bc494f42640@gmail.com> Date: Sun, 26 Jul 2026 04:58:22 +0800 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] drm/panel-edp: Add BOE NE140QDM-NX2 To: Doug Anderson Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <697e79c2-98a9-4bb3-b5fb-db327cbe1bce@gmail.com> <051ca77a-4308-4084-b9c1-5bbe4ea39f9c@gmail.com> Content-Language: en-US From: Weiji Wang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 7/26/26 00:29, Doug Anderson wrote: > Right that using the "enable" delay is more conservative, but it does > sound as if "prepare_to_enable" is more correct in this case if you > are provided "(T4+T5+T6+T8)-min". > > I re-looked at the one panel using "delay_200_500_p2e80" > (NV116WHM-T01), since I still have access to that datasheet. There, I > see: > > T4+T5+T6+T8 > 80ms > 0ms < T7 <= 50ms > 50ms < T8 > > In other words, T7-max is 50 and T8-min is 50. > > Based on that, I believe it would be more correct for this panel to > use "delay_200_500_e50_p2e80". I'll try to send a patch for that, > which would get rid of the need for "delay_200_500_p2e80". > > Does that match your panel, too? > > -Doug Yes, the constraints of T4+T5+T6+T8, T7 and T8 is exactly same as mine. However, my copy of datasheet did not mention min/max value of T6, and it feels like assuming T6-min=0 if setting 'enable' to 50ms, or max(T7-max, T8-min). Is that proper? Sorry to inconvenience you due to my inexperience in LCD panels.