From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3D8E913AC2 for ; Fri, 13 Oct 2023 11:25:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from mail.andi.de1.cc (unknown [IPv6:2a02:c205:3004:2154::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E76691; Fri, 13 Oct 2023 04:25:16 -0700 (PDT) Received: from p5dc58bc7.dip0.t-ipconnect.de ([93.197.139.199] helo=aktux) by mail.andi.de1.cc with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1qrGHx-004ueB-FE; Fri, 13 Oct 2023 13:25:05 +0200 Date: Fri, 13 Oct 2023 13:25:03 +0200 From: Andreas Kemnade To: =?UTF-8?B?UMOpdGVy?= Ujfalusi Cc: Tony Lindgren , bcousson@baylibre.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, jarkko.nikula@bitmer.com, dmitry.torokhov@gmail.com, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org Subject: Re: [PATCH 1/3] ASoC: ti: omap-mcbsp: Ignore errors for getting fck_src Message-ID: <20231013132503.25d63933@aktux> In-Reply-To: References: <20230705190324.355282-1-andreas@kemnade.info> <20230705190324.355282-2-andreas@kemnade.info> <7d58d52d-2087-45af-b29e-2515b63ead13@gmail.com> <20230920063353.GQ5285@atomide.com> <20230921121626.GT5285@atomide.com> <20231006102348.GK34982@atomide.com> <20231006213003.0fbac87a@aktux> <20231007062518.GM34982@atomide.com> <20231007091156.588d7ba1@aktux> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.37; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Thu, 12 Oct 2023 17:41:34 +0300 P=C3=A9ter Ujfalusi wrote: > On 07/10/2023 10:11, Andreas Kemnade wrote: > >> OK good to hear it works, I'll send out fixes for omap4 and 5, seems > >> the runtime PM warning is something different. > >> =20 > >>> omap-mcbsp 40124000.mcbsp: Runtime PM usage count underflow! > >>> # cat /sys/bus/platform/devices/40124000.mcbsp/power/runtime_status=20 > >>> active > >>> > >>> even with no sound. =20 > >> =20 > > Well, it is a regression caused by your fix. Without it (and not revert= ing > > the already applied ignore patch), runtime is properly suspended. Don't= know > > why yet. =20 >=20 > I guess it is because of the pm_runtime_put_sync() in the > omap2_mcbsp_set_clks_src() around the fclk re-parenting. > That is a bit dubious thing for sure. We need to disable the device to > be able to re-parent the fclk but if we disable the device it is going > to be powered down, right? I think we have appropriate context handling, > so it might work, but it is certainly not a rock solid code... If you > have a stream running already, you don't really want to kill the McBSP. >=20 Ok, so if the device is powered of at omap2_mcbsp_set_clks_src()=20 we get the usage count underflow, and the counter is incremented immediately again in the runtime put function. So things get out of balance= ... I'll check Tony's fix here. > The problem is that this mux is outside of the McBSP IP, so we need a > system level (iow, clk API) way to change it runtime. >=20 > What is the machine driver where this happens? If you set the sysclk in > hw_params of the machine driver, it will be OK, but if you do that in > probe time then it is likely going to fail as you experienced >=20 As you see in the other patches of this series, it is a simple-audio-card with a tlv320aic3x codec in combination with the mcbsp. Regards, Andreas