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Thu, 08 Jan 2026 08:30:17 -0800 (PST) Received: from owl5 ([2001:861:3201:3d10:f038:1f4:4b8b:647c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bd5ee5eesm17365651f8f.34.2026.01.08.08.30.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jan 2026 08:30:17 -0800 (PST) Date: Thu, 8 Jan 2026 17:30:15 +0100 From: Gary Bisson To: AngeloGioacchino Del Regno Cc: chunkuang.hu@kernel.org, p.zabel@pengutronix.de, airlied@gmail.com, simona@ffwll.ch, matthias.bgg@gmail.com, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com Subject: Re: [PATCH] drm/mediatek: mtk_dsi: Add support for High Speed (HS) mode Message-ID: References: <20260108101959.14872-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260108101959.14872-1-angelogioacchino.delregno@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260108_083020_471206_378E623B X-CRM114-Status: GOOD ( 12.17 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Thu, Jan 08, 2026 at 11:19:59AM +0100, AngeloGioacchino Del Regno wrote: > Up until now, the MediaTek DSI Controller has always been working > in Low Power Mode (LPM), as this driver has always ignored the > MIPI_DSI_MSG_USE_LPM flag hence never setting HS mode. > > In the current state of the driver the only thing that is needed > to add support for DSI High Speed (HS) transmit is to simply set > the "HSTX" config bit in the configuration register. > > Check if flag MIPI_DSI_MSG_USE_LPM is set and, if not, set HSTX. > > Signed-off-by: AngeloGioacchino Del Regno Tested-by: Gary Bisson This patch was needed for the TI SN65DSI83 DSI to LVDS bridge to work as it requires HS mode. Regards, Gary