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From: "Diederik de Haas" To: "Cristian Ciocaltea" , "Diederik de Haas" , "Sandy Huang" , =?utf-8?q?Heiko_St=C3=BCbner?= , "Andy Yan" , "David Airlie" , "Simona Vetter" , "Maarten Lankhorst" , "Maxime Ripard" , "Thomas Zimmermann" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Philipp Zabel" , "Andrzej Hajda" , "Neil Armstrong" , "Robert Foss" , "Laurent Pinchart" , "Jonas Karlman" , "Jernej Skrabec" , "Luca Ceresoli" Cc: , "Andy Yan" , , , , , References: <20260617-dw-hdmi-qp-yuv-v1-0-a665cfd06d7d@collabora.com> <20260617-dw-hdmi-qp-yuv-v1-2-a665cfd06d7d@collabora.com> In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260705_152033_284110_0AF62975 X-CRM114-Status: GOOD ( 12.02 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Hi Cristian, On Sun Jul 5, 2026 at 10:46 PM CEST, Cristian Ciocaltea wrote: > On 7/5/26 4:28 PM, Diederik de Haas wrote: >> On Wed Jun 17, 2026 at 8:52 PM CEST, Cristian Ciocaltea wrote: >>> Assert the AXI reset in the CRTC disable path, and the VP DCLK reset in >>> the enable path. >>> >>> These resets are intended to leave the hardware in a clean state for the >>> next use, helping recover from exceptions such as IOMMU page faults, as >>> well as to prevent random display output glitches, such as a blank >>> image, observed when switching modes that also change the color format, >>> e.g. from RGB to YUV420 and vice versa. >>> >>> For now this seems to affect only the RK3588, hence the resets are >>> optional and will be provided in the device tree for this SoC only. >> >> Why do you think it only effect RK3588? > > My findings are exclusively in the context of validating YUV support for DW HDMI > QP, hence targeting RK3588 and RK3576. Since RK3576 didn't exhibit any > anomalies, I concluded the resets are needed just for RK3588. Ok, that's indeed a different technology stack. >> I reported about my RK3568 test here: >> https://lore.kernel.org/linux-rockchip/DFRU6ODDM71P.3NQGLRK8IVDUY@cknow-tech.com/ >> "I then went on to try LibreELEC's builds. The artifacts I (sometimes) >> saw, were gone :-D OTOH, I did get several major issues 'in return', >> like rk_iommu Page fault resulting in a black screen and the only way to >> 'recover' from it, was a reboot." >> >> And I reported some more test results here: >> https://forum.libreelec.tv/thread/29953-le13-testing-for-rk3288-rk3328-rk3399-rk3566-rk3568-rk3576-rk3588/?postID=204691#post204691 >> >> That seems to me a (strong) indication it also affects RK3566/RK3568? > > If coincidentally this helps improve the reliability of some of the older SoCs > as well, the resets can easily be added to the corresponding DTs and submitted > as a follow-up series. Agreed. Thanks :) Cheers, Diederik _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip