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bh=zVFcKhkUdETrp1c8XKKoPxdTEHK11EffXAPvYnESbUI=; b=X6HM1B73FohTlPdstllNH10OpGsFr4saiixWKoNahZO8w64STBnifa9Ng9OnTkcBi5eZop HfLzfXdiWoHWVV2DppgIeSJGCvNpQUWuzg7+IuAy/DEPt9ZMzwCcRSud/hHn8lkPBnqF8N PG8mAVbOXwlg9+uJKIUKRXnUzqo2MU5sqXYMSLEJf+FHDpwqmx9v5Az/+Tf+Yr+tD7VkRL ryjXtPBrbzEZsav5a2wbqV4DmltTUCoq3lkJVTy/W/wwFtLZL8CR0h6KKdLjZulp4R/hbW 1g8gkeYaYkRWcnRbTpBZgu4GtUIA90FrqeCQsckTZjQIAdSdSljEA96tMgSsBg== Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 19 Jan 2026 17:18:06 +0100 Message-Id: From: "Luca Ceresoli" Subject: Re: [PATCH v4 04/25] drm/tilcdc: Add support for DRM bus flags and simplify panel config Cc: "Markus Schneider-Pargmann" , "Bajjuri Praneeth" , "Louis Chauvet" , "Thomas Petazzoni" , "Miguel Gazquez" , "Herve Codina" , , , , , To: "Kory Maincent (TI.com)" , "Jyri Sarha" , "Tomi Valkeinen" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "David Airlie" , "Simona Vetter" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Russell King" , "Bartosz Golaszewski" , "Tony Lindgren" , "Andrzej Hajda" , "Neil Armstrong" , "Robert Foss" , "Laurent Pinchart" , "Jonas Karlman" , "Jernej Skrabec" X-Mailer: aerc 0.20.1 References: <20260116-feature_tilcdc-v4-0-2c1c22143087@bootlin.com> <20260116-feature_tilcdc-v4-4-2c1c22143087@bootlin.com> In-Reply-To: <20260116-feature_tilcdc-v4-4-2c1c22143087@bootlin.com> X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260119_081827_716830_DEC2AE5C X-CRM114-Status: GOOD ( 10.12 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri Jan 16, 2026 at 6:02 PM CET, Kory Maincent (TI.com) wrote: > Migrate CRTC mode configuration to use standard DRM bus flags in > preparation for removing the tilcdc_panel driver and its custom > tilcdc_panel_info structure. > > Add support for DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE and > DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE flags to control pixel clock and sync > signal edge polarity, while maintaining backward compatibility with the > existing tilcdc panel info structure. > > Simplify several hardware parameters by setting them to fixed defaults > based on common usage across existing device trees: > - DMA burst size: 16 (previously configurable via switch statement) > - AC bias frequency: 255 (previously panel-specific) > - FIFO DMA request delay: 128 (previously panel-specific) > > These parameters show no variation in real-world usage, so hardcoding > them simplifies the driver without losing functionality. > > Preserve FIFO threshold configurability by detecting the SoC type, as > this parameter varies between AM33xx (8) and DA850 (16) platforms. > > Signed-off-by: Kory Maincent (TI.com) Reviewed-by: Luca Ceresoli -- Luca Ceresoli, Bootlin Embedded Linux and Kernel engineering https://bootlin.com