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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BE3CC04A95 for ; Wed, 28 Sep 2022 19:48:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231499AbiI1Tsr (ORCPT ); Wed, 28 Sep 2022 15:48:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229725AbiI1Tso (ORCPT ); Wed, 28 Sep 2022 15:48:44 -0400 Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9255C7AC29 for ; Wed, 28 Sep 2022 12:48:43 -0700 (PDT) Received: by mail-lf1-x135.google.com with SMTP id a3so21874098lfk.9 for ; Wed, 28 Sep 2022 12:48:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date; bh=XZ2C8PFfFGZso1Vlxd/6CVlqAXMIAAgQjF1Biv8y1Og=; b=oCTGbIFkQYEci/Hbrd+xQ2vUzu1JTp4bVF0X114/0S8uFUFyZ3oPjwFO5UCnnYpzCf aTd0405dOaHXJb7smPuSto6XHWEHX8gG8L1nIBWyRr5k6bF6IMHHgNsTklxaAHwyBHWf v7Ph2+oE1wSbZ9zKE/YGhty3gzsBDLGLsVQFl/ytM3utLvNNseVAPrK2a3qfy7LQdNGy wpu7QCR2VSsgMU+FVCOJyoga4qlSyxao/0OQSC6tTszGEZwHTuDDa6uHREbfBxhPRrfP sRtMRKTiyv/6rUDU1GYQytaUGQoOV5ypAYLH5kb6H2bnBe2zXGGoTjJ2J3AzWvvyOUiP LFIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:references:cc:to:from :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date; bh=XZ2C8PFfFGZso1Vlxd/6CVlqAXMIAAgQjF1Biv8y1Og=; b=XuqOzEaxhhUVBgcZcMdGZe/LPtuFERwJcYZtS0yG0X9DIE+v38Vzg3bXue+63UC32D cBDR/uawhSloak3qH8BuDjZ2EXpTOPXkJaMoOVm/vsN0/TwU9gqv8Lg9j2U1F5Hr8UzX yrjnbxpxd+6Ss5lnUYVnkwB5qIwkWuNWbqsamNfkPmpHbw2Bzr+AMbd5sSRZ3QkAHELy yKDg26A24QSv/7lOJVfWe5Mt/A9B+s7A0vucVVtCi26x6oFIuJARt5nVR5T/r0ghe3bX sIXxIkwTDpDUngLsD4dHC6B9FVx6krgHzGhUgUc4MgaG6UuBAeCmzCW6emh7xetC1Jqx 6iSQ== X-Gm-Message-State: ACrzQf0DJD2nTmm/QFpQXZtgHkP5elME5TFANC5nUAGv1VgI/gajqYVG t73e0uc36pW2trnRO927oBWopg== X-Google-Smtp-Source: AMsMyM5XvHWk0KfJlDfwWXBgryoUNqTHEfxcLsVWW9BozcMHMnmLr5A58Hhz+IkNmELGPVFaP9fDzg== X-Received: by 2002:a05:6512:3f97:b0:4a1:f6b9:5198 with SMTP id x23-20020a0565123f9700b004a1f6b95198mr2368963lfa.588.1664394521910; Wed, 28 Sep 2022 12:48:41 -0700 (PDT) Received: from [192.168.1.211] ([37.153.55.125]) by smtp.gmail.com with ESMTPSA id g19-20020ac25393000000b0049482adb3basm558108lfh.63.2022.09.28.12.48.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Sep 2022 12:48:41 -0700 (PDT) Message-ID: Date: Wed, 28 Sep 2022 22:48:40 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: [PATCH 06/13] phy: qcom-qmp-pcie: drop bogus register update Content-Language: en-GB From: Dmitry Baryshkov To: Johan Hovold , Vinod Koul Cc: Andy Gross , Bjorn Andersson , Konrad Dybcio , Kishon Vijay Abraham I , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org References: <20220928152822.30687-1-johan+linaro@kernel.org> <20220928152822.30687-7-johan+linaro@kernel.org> <2bc50ea4-ec29-cacc-216b-1c21d2d2f0bc@linaro.org> In-Reply-To: <2bc50ea4-ec29-cacc-216b-1c21d2d2f0bc@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 28/09/2022 22:10, Dmitry Baryshkov wrote: > On 28/09/2022 18:28, Johan Hovold wrote: >> Since commit 0d58280cf1e6 ("phy: Update PHY power control sequence") the >> PHY is powered on before configuring the registers and only the MSM8996 >> PCIe PHY, which includes the POWER_DOWN_CONTROL register in its PCS >> initialisation table, may possibly require a second update afterwards. >> >> To make things worse, the POWER_DOWN_CONTROL register lies at a >> different offset on more recent SoCs so that the second update, which >> still used a hard-coded offset, would write to an unrelated register >> (e.g. a revision-id register on SC8280XP). >> >> As the MSM8996 PCIe PHY is now handled by a separate driver, simply drop >> the bogus register update. >> >> Fixes: e4d8b05ad5f9 ("phy: qcom-qmp: Use proper PWRDOWN offset for >> sm8150 USB") added support > > I'm not sure about the particular fixes tag. Backporting from the split > driver into old qmp driver would be a complete pain. > >> Signed-off-by: Johan Hovold > > Reviewed-by: Dmitry Baryshkov After digging some more, I stumbled upon the commit 0d58280cf1e6 ("phy: Update PHY power control sequence"), which puts explicit register write here, telling that 'PCIe PHYs need an extra power control before deasserts reset state'. I can confirm this with the register tables from downstream dtsi. E.g. consider sdm845-pcie.dts, pcie0 table. The PCS_POWER_DOWN_CONTROL is the register 0x804. The programmings starts with <0x804 0x1 0x0>, writing 1 to PCS_POWER_DOWN_CONTROL (which if I'm not mistaken we do not do at this moment). Then after writing all the serdes/tx/rx/pcs/pcs_misc tables comes the write <0x804 0x3 0x0> (which you are trying to remove here). Same sequence applies to the PCIe PHY on msm8998. Most newer PHYs have the expected sequence (of writing 0x3 to PCS_POWER_DOWN_CONTROL) before writing all registers. As a short summary: unless we get any additional information that 8998 and sdm845 tables are incorrect, I'd suggest adding a conditional here (ugh) and using it here and in qmp_pcie_init() call. Vinod, Bjorn, do you have any additional info? > >> --- >>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 6 ------ >>   1 file changed, 6 deletions(-) >> >> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c >> b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c >> index 4146545fdf5f..eea66c24cf7e 100644 >> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c >> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c >> @@ -1953,12 +1953,6 @@ static int qmp_pcie_power_on(struct phy *phy) >>       qmp_pcie_configure(pcs_misc, cfg->regs, cfg->pcs_misc_tbl, >> cfg->pcs_misc_tbl_num); >>       qmp_pcie_configure(pcs_misc, cfg->regs, cfg->pcs_misc_tbl_sec, >> cfg->pcs_misc_tbl_num_sec); >> -    /* >> -     * Pull out PHY from POWER DOWN state. >> -     * This is active low enable signal to power-down PHY. >> -     */ >> -    qphy_setbits(pcs, QPHY_V2_PCS_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl); >> - >>       if (cfg->has_pwrdn_delay) >>           usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max); > -- With best wishes Dmitry 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 485DAC32771 for ; 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Wed, 28 Sep 2022 12:48:41 -0700 (PDT) Message-ID: Date: Wed, 28 Sep 2022 22:48:40 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: [PATCH 06/13] phy: qcom-qmp-pcie: drop bogus register update Content-Language: en-GB From: Dmitry Baryshkov To: Johan Hovold , Vinod Koul Cc: Andy Gross , Bjorn Andersson , Konrad Dybcio , Kishon Vijay Abraham I , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org References: <20220928152822.30687-1-johan+linaro@kernel.org> <20220928152822.30687-7-johan+linaro@kernel.org> <2bc50ea4-ec29-cacc-216b-1c21d2d2f0bc@linaro.org> In-Reply-To: <2bc50ea4-ec29-cacc-216b-1c21d2d2f0bc@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220928_124846_632686_EBFD3D3F X-CRM114-Status: GOOD ( 19.24 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org T24gMjgvMDkvMjAyMiAyMjoxMCwgRG1pdHJ5IEJhcnlzaGtvdiB3cm90ZToKPiBPbiAyOC8wOS8y MDIyIDE4OjI4LCBKb2hhbiBIb3ZvbGQgd3JvdGU6Cj4+IFNpbmNlIGNvbW1pdCAwZDU4MjgwY2Yx ZTYgKCJwaHk6IFVwZGF0ZSBQSFkgcG93ZXIgY29udHJvbCBzZXF1ZW5jZSIpIHRoZQo+PiBQSFkg aXMgcG93ZXJlZCBvbiBiZWZvcmUgY29uZmlndXJpbmcgdGhlIHJlZ2lzdGVycyBhbmQgb25seSB0 aGUgTVNNODk5Ngo+PiBQQ0llIFBIWSwgd2hpY2ggaW5jbHVkZXMgdGhlIFBPV0VSX0RPV05fQ09O VFJPTCByZWdpc3RlciBpbiBpdHMgUENTCj4+IGluaXRpYWxpc2F0aW9uIHRhYmxlLCBtYXkgcG9z c2libHkgcmVxdWlyZSBhIHNlY29uZCB1cGRhdGUgYWZ0ZXJ3YXJkcy4KPj4KPj4gVG8gbWFrZSB0 aGluZ3Mgd29yc2UsIHRoZSBQT1dFUl9ET1dOX0NPTlRST0wgcmVnaXN0ZXIgbGllcyBhdCBhCj4+ IGRpZmZlcmVudCBvZmZzZXQgb24gbW9yZSByZWNlbnQgU29DcyBzbyB0aGF0IHRoZSBzZWNvbmQg dXBkYXRlLCB3aGljaAo+PiBzdGlsbCB1c2VkIGEgaGFyZC1jb2RlZCBvZmZzZXQsIHdvdWxkIHdy aXRlIHRvIGFuIHVucmVsYXRlZCByZWdpc3Rlcgo+PiAoZS5nLiBhIHJldmlzaW9uLWlkIHJlZ2lz dGVyIG9uIFNDODI4MFhQKS4KPj4KPj4gQXMgdGhlIE1TTTg5OTYgUENJZSBQSFkgaXMgbm93IGhh bmRsZWQgYnkgYSBzZXBhcmF0ZSBkcml2ZXIsIHNpbXBseSBkcm9wCj4+IHRoZSBib2d1cyByZWdp c3RlciB1cGRhdGUuCj4+Cj4+IEZpeGVzOiBlNGQ4YjA1YWQ1ZjkgKCJwaHk6IHFjb20tcW1wOiBV c2UgcHJvcGVyIFBXUkRPV04gb2Zmc2V0IGZvciAKPj4gc204MTUwIFVTQiIpIGFkZGVkIHN1cHBv cnQKPiAKPiBJJ20gbm90IHN1cmUgYWJvdXQgdGhlIHBhcnRpY3VsYXIgZml4ZXMgdGFnLiBCYWNr cG9ydGluZyBmcm9tIHRoZSBzcGxpdCAKPiBkcml2ZXIgaW50byBvbGQgcW1wIGRyaXZlciB3b3Vs ZCBiZSBhIGNvbXBsZXRlIHBhaW4uCj4gCj4+IFNpZ25lZC1vZmYtYnk6IEpvaGFuIEhvdm9sZCA8 am9oYW4rbGluYXJvQGtlcm5lbC5vcmc+Cj4gCj4gUmV2aWV3ZWQtYnk6IERtaXRyeSBCYXJ5c2hr b3YgPGRtaXRyeS5iYXJ5c2hrb3ZAbGluYXJvLm9yZz4KCkFmdGVyIGRpZ2dpbmcgc29tZSBtb3Jl LCBJIHN0dW1ibGVkIHVwb24gdGhlIGNvbW1pdCAwZDU4MjgwY2YxZTYgKCJwaHk6IApVcGRhdGUg UEhZIHBvd2VyIGNvbnRyb2wgc2VxdWVuY2UiKSwgd2hpY2ggcHV0cyBleHBsaWNpdCByZWdpc3Rl ciB3cml0ZSAKaGVyZSwgdGVsbGluZyB0aGF0ICdQQ0llIFBIWXMgbmVlZCBhbiBleHRyYSBwb3dl ciBjb250cm9sIGJlZm9yZSAKZGVhc3NlcnRzIHJlc2V0IHN0YXRlJy4KCkkgY2FuIGNvbmZpcm0g dGhpcyB3aXRoIHRoZSByZWdpc3RlciB0YWJsZXMgZnJvbSBkb3duc3RyZWFtIGR0c2kuIEUuZy4g CmNvbnNpZGVyIHNkbTg0NS1wY2llLmR0cywgcGNpZTAgdGFibGUuIFRoZSBQQ1NfUE9XRVJfRE9X Tl9DT05UUk9MIGlzIHRoZSAKcmVnaXN0ZXIgMHg4MDQuCgpUaGUgcHJvZ3JhbW1pbmdzIHN0YXJ0 cyB3aXRoIDwweDgwNCAweDEgMHgwPiwgd3JpdGluZyAxIHRvIApQQ1NfUE9XRVJfRE9XTl9DT05U Uk9MICh3aGljaCBpZiBJJ20gbm90IG1pc3Rha2VuIHdlIGRvIG5vdCBkbyBhdCB0aGlzIAptb21l bnQpLiBUaGVuIGFmdGVyIHdyaXRpbmcgYWxsIHRoZSBzZXJkZXMvdHgvcngvcGNzL3Bjc19taXNj IHRhYmxlcyAKY29tZXMgdGhlIHdyaXRlIDwweDgwNCAweDMgMHgwPiAod2hpY2ggeW91IGFyZSB0 cnlpbmcgdG8gcmVtb3ZlIGhlcmUpLgoKU2FtZSBzZXF1ZW5jZSBhcHBsaWVzIHRvIHRoZSBQQ0ll IFBIWSBvbiBtc204OTk4LgoKTW9zdCBuZXdlciBQSFlzIGhhdmUgdGhlIGV4cGVjdGVkIHNlcXVl bmNlIChvZiB3cml0aW5nIDB4MyB0byAKUENTX1BPV0VSX0RPV05fQ09OVFJPTCkgYmVmb3JlIHdy aXRpbmcgYWxsIHJlZ2lzdGVycy4KCkFzIGEgc2hvcnQgc3VtbWFyeTogdW5sZXNzIHdlIGdldCBh bnkgYWRkaXRpb25hbCBpbmZvcm1hdGlvbiB0aGF0IDg5OTggCmFuZCBzZG04NDUgdGFibGVzIGFy ZSBpbmNvcnJlY3QsIEknZCBzdWdnZXN0IGFkZGluZyBhIGNvbmRpdGlvbmFsIGhlcmUgCih1Z2gp IGFuZCB1c2luZyBpdCBoZXJlIGFuZCBpbiBxbXBfcGNpZV9pbml0KCkgY2FsbC4KClZpbm9kLCBC am9ybiwgZG8geW91IGhhdmUgYW55IGFkZGl0aW9uYWwgaW5mbz8KCj4gCj4+IC0tLQo+PiDCoCBk cml2ZXJzL3BoeS9xdWFsY29tbS9waHktcWNvbS1xbXAtcGNpZS5jIHwgNiAtLS0tLS0KPj4gwqAg MSBmaWxlIGNoYW5nZWQsIDYgZGVsZXRpb25zKC0pCj4+Cj4+IGRpZmYgLS1naXQgYS9kcml2ZXJz L3BoeS9xdWFsY29tbS9waHktcWNvbS1xbXAtcGNpZS5jIAo+PiBiL2RyaXZlcnMvcGh5L3F1YWxj b21tL3BoeS1xY29tLXFtcC1wY2llLmMKPj4gaW5kZXggNDE0NjU0NWZkZjVmLi5lZWE2NmMyNGNm N2UgMTAwNjQ0Cj4+IC0tLSBhL2RyaXZlcnMvcGh5L3F1YWxjb21tL3BoeS1xY29tLXFtcC1wY2ll LmMKPj4gKysrIGIvZHJpdmVycy9waHkvcXVhbGNvbW0vcGh5LXFjb20tcW1wLXBjaWUuYwo+PiBA QCAtMTk1MywxMiArMTk1Myw2IEBAIHN0YXRpYyBpbnQgcW1wX3BjaWVfcG93ZXJfb24oc3RydWN0 IHBoeSAqcGh5KQo+PiDCoMKgwqDCoMKgIHFtcF9wY2llX2NvbmZpZ3VyZShwY3NfbWlzYywgY2Zn LT5yZWdzLCBjZmctPnBjc19taXNjX3RibCwgCj4+IGNmZy0+cGNzX21pc2NfdGJsX251bSk7Cj4+ IMKgwqDCoMKgwqAgcW1wX3BjaWVfY29uZmlndXJlKHBjc19taXNjLCBjZmctPnJlZ3MsIGNmZy0+ cGNzX21pc2NfdGJsX3NlYywgCj4+IGNmZy0+cGNzX21pc2NfdGJsX251bV9zZWMpOwo+PiAtwqDC oMKgIC8qCj4+IC3CoMKgwqDCoCAqIFB1bGwgb3V0IFBIWSBmcm9tIFBPV0VSIERPV04gc3RhdGUu Cj4+IC3CoMKgwqDCoCAqIFRoaXMgaXMgYWN0aXZlIGxvdyBlbmFibGUgc2lnbmFsIHRvIHBvd2Vy LWRvd24gUEhZLgo+PiAtwqDCoMKgwqAgKi8KPj4gLcKgwqDCoCBxcGh5X3NldGJpdHMocGNzLCBR UEhZX1YyX1BDU19QT1dFUl9ET1dOX0NPTlRST0wsIGNmZy0+cHdyZG5fY3RybCk7Cj4+IC0KPj4g wqDCoMKgwqDCoCBpZiAoY2ZnLT5oYXNfcHdyZG5fZGVsYXkpCj4+IMKgwqDCoMKgwqDCoMKgwqDC oCB1c2xlZXBfcmFuZ2UoY2ZnLT5wd3Jkbl9kZWxheV9taW4sIGNmZy0+cHdyZG5fZGVsYXlfbWF4 KTsKPiAKCi0tIApXaXRoIGJlc3Qgd2lzaGVzCkRtaXRyeQoKCi0tIApsaW51eC1waHkgbWFpbGlu ZyBsaXN0CmxpbnV4LXBoeUBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHBzOi8vbGlzdHMuaW5mcmFk ZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXBoeQo=