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charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2375ff5fb664d8de9627e76788bd40b5d8eabf35.camel@icenowy.me> On Sat, Jul 27, 2024 at 01:21:39PM +0800, Icenowy Zheng wrote: > 在 2024-07-26星期五的 09:38 -0700，Drew Fustini写道： > > On Fri, Jul 26, 2024 at 03:45:36AM -0500, Emil Renner Berthing wrote: > > > Stephen Boyd wrote: > > > > Quoting Drew Fustini (2024-06-23 19:12:31) > > > > > Document bindings for the T-Head TH1520 AP sub-system clock > > > > > controller. > > > > > > > > > > Link: > > > > > https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf > > > > > Co-developed-by: Yangtao Li > > > > > Signed-off-by: Yangtao Li > > > > > Reviewed-by: Conor Dooley > > > > > Signed-off-by: Drew Fustini > > > > > --- > > > > > > > > Applied to clk-next > > > > > > Thanks, but this driver seems a bit incomplete. With this applied > > > the Lichee Pi > > > 4A no longer boots without the clk_ignore_unused kernel parameter. > > > > > > /Emil > > > > Is this the case when you apply the dts patches from this series? > > > > The dts patches won't go in until 6.12 so I don't think the presence > > of > > the clk-th1520-ap.c itself in 6.11 would break existing systems. > > > > That said, I have been using clk_ignore_unused. I had been thinking > > that > > made sense because the full set of clock controller drivers like > > AON_SUBSYS (always on), AUDIO_SUBSYS, DSP_SUBSYS, etc, are not > > present > > yet in mainline. However, the T-Head vendor kernel does have drivers > > for > > all those clock controllers and I was suprised to see that the vendor > > kernel fails to boot when I just tested removing clk_ignore_unused. > > > > As for clk-th1520-ap.c in mainline, I'll investigate further which > > clk > > disables seem to causing the boot failure when using the dts from > > this > > series. I suspect I may need to add nodes that will cause the > > necessary > > clks to be enabled by their respective drivers. > > If disabling the clock just leads to system hang, setting > CLK_IS_CRITICAL should be useful (and needed) here. Thank you for the suggestion about CLK_IS_CRITICAL. I have found through process of elimination that the "emmc-sdio" clock (CLK_EMMC_SDIO) fails to work after the "vp-axi" clock (CLK_VP_AXI) is disabled. I added the CLK_IGNORE_UNUSED flag to "vp-axi" and the system is able to boot correctly. I think in that case CLK_IS_CRITICAL is not needed. I've been reviewing the TH1520 System User Manual [1] and I am uncertain why the state of "vp-axi" would affect "emmc-sdio": - EMMC_SDIO_REF_CLK_EN is bit 30 in PERI_CLK_CFG (offset 0x204). - VPSYS_AXI_ACLK_EN is bit 15 in VPSYS_CLK_CFG (offsset 0x1e0). I don't see any linkage between them in the public documentation. Regardless, the addition of the CLK_IGNORE_UNUSED flag to "vp-axi" fixes the boot failure, so I will post a patch to that effect. Thanks, Drew [1] https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9813BC3DA7F for ; Tue, 30 Jul 2024 23:05:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Tue, 30 Jul 2024 16:05:04 -0700 (PDT) Date: Tue, 30 Jul 2024 16:05:02 -0700 From: Drew Fustini To: Icenowy Zheng , Emil Renner Berthing Cc: Stephen Boyd , Albert Ou , Conor Dooley , Drew Fustini , Fu Wei , Guo Ren , Jisheng Zhang , Krzysztof Kozlowski , Michael Turquette , Palmer Dabbelt , Paul Walmsley , Rob Herring , Thomas Bonnefille , Yangtao Li , linux-riscv@lists.infradead.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Conor Dooley Subject: Re: [PATCH v2 1/7] dt-bindings: clock: Document T-Head TH1520 AP_SUBSYS controller Message-ID: References: <20240623-th1520-clk-v2-0-ad8d6432d9fb@tenstorrent.com> <20240623-th1520-clk-v2-1-ad8d6432d9fb@tenstorrent.com> <57ef2eef45f2de15e6607da266b37b2a.sboyd@kernel.org> <2375ff5fb664d8de9627e76788bd40b5d8eabf35.camel@icenowy.me> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2375ff5fb664d8de9627e76788bd40b5d8eabf35.camel@icenowy.me> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240730_160506_994906_B518E65A X-CRM114-Status: GOOD ( 28.40 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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