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 36CE7E77188 for ; Sun, 22 Dec 2024 14:33:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=rEgpgPcyCg7jDwysVxgFPHsSofyHT1zBrfeYXN+E8VA=; b=kIe9qVAwadh6aXDpEnuhpP8MTm H3b2q+fsMLrPseoQ8YyMkz8r4IN8FOwPr6D7r/UcrglWb2XdsDXOEPyrGuUnCPvmOp+O+NLZvnKVT Jvb36CsJgdB+Q4KT/+WisWR9Gv9fGRGPf7YtOGVsqoOKwT7Gdkgi/TGRRkvz3ZWr5Wcf2L3sRl9NC GAAEXlbmQxmV2GFzUaZ9wlhHRvhuhv5ziHTVXNfSmkktyS8tzECrlMUdaW1renefYpgSyqTyxtv1s jZkQNMdJyjxxKftPQCHCE8pxx9zN7JGu3tgiaVFWl+Oaq2pw4rIrpuhqBuAm8X+THvnm0qX131u4k Bbjtfkag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tPN1K-00000008OM3-3X0D; Sun, 22 Dec 2024 14:33:26 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tPMsV-00000008N7n-38LF for linux-arm-kernel@lists.infradead.org; Sun, 22 Dec 2024 14:24:20 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 6AFF45C4A0E; Sun, 22 Dec 2024 14:23:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C783C4CEDC; Sun, 22 Dec 2024 14:24:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734877459; bh=0XcZORZTYCC8Zsw33n+0LgRXzG40hhH2RqpgjdwCwhE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=PkkAXBZb9TGY0K7hOXgzRvYEdaZZgkETkLX4L7yI+IGjpFqSTODldC6ewGhBfrNVe 8m0gQW8KXjEuMRxdoQR4ehPMGkdMBo5pI53dbhMj+hybUWrGU3l4e93b/vNY9uiN/M MJ6JSsZ7eAaXWvHTOHmq0Mcf2krJTCOfkv6ULOi6h8JQwW2raWXLIur2IEW585TQ2O dOY7zH7BnaPRXtB+98sYHhJpHT+nrYQHlvIIOofUASxpRLVRfp8mcRyPes7G8EOLY7 mIItlupS0xvHYunHHvar3TumKvvGVw22gIDxQDzKRg6X7fu7gzg2BfS+xAi3EkmBA+ 9gcBjkQUmXYHA== Message-ID: Date: Sun, 22 Dec 2024 13:17:18 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] soc: samsung: exynos-pmu: enable CPU hotplug support for gs101 To: Peter Griffin , Rob Herring , Conor Dooley , Alim Akhtar , Krzysztof Kozlowski , Lee Jones Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, tudor.ambarus@linaro.org, andre.draszik@linaro.org, willmcvicker@google.com, kernel-team@android.com References: <20241213-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v1-0-c72978f63713@linaro.org> <20241213-contrib-pg-cpu-hotplug-suspend2ram-fixes-v1-v1-4-c72978f63713@linaro.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241222_062419_920341_1B52EE71 X-CRM114-Status: GOOD ( 18.69 ) 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 13/12/2024 17:44, Peter Griffin wrote: > /* > @@ -325,6 +328,52 @@ struct regmap *exynos_get_pmu_regmap_by_phandle(struct device_node *np, > } > EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap_by_phandle); > > +/* > + * CPU_INFORM register hint values which are used by > + * EL3 firmware (el3mon). > + */ > +#define CPU_INFORM_CLEAR 0 > +#define CPU_INFORM_C2 1 > + > +static int cpuhp_pmu_online(unsigned int cpu) exynos_cpuhp_pmu_online or gs101_cpuhp_pmu_online same for offline > +{ > + void __iomem *base = pmu_context->pmuintrgen_base; > + u32 reg; > + u32 mask; > + > + /* clear cpu inform hint */ > + regmap_write(pmu_context->pmureg, GS101_CPU_INFORM(cpu), > + CPU_INFORM_CLEAR); > + > + mask = (1 << cpu); BIT(cpu) > + > + writel(((0 << cpu) & mask), base + GS101_GRP2_INTR_BID_ENABLE); I am not sure if I follow. You want to zero-out all other bits or enable all other bits? > + > + reg = readl(base + GS101_GRP2_INTR_BID_UPEND) & mask; > + writel(reg & mask, base + GS101_GRP2_INTR_BID_CLEAR); reg is &mask twice. I don't follow this either, are these auto-cleared? It feels like you wanted to update some bits, but you are updating entire registers in both cases. > + > + return 0; > +} > + > +static int cpuhp_pmu_offline(unsigned int cpu) > +{ > + void __iomem *base = pmu_context->pmuintrgen_base; > + u32 reg, mask; > + > + /* set cpu inform hint */ > + regmap_write(pmu_context->pmureg, GS101_CPU_INFORM(cpu), > + CPU_INFORM_C2); > + > + writel((1 << cpu), base + GS101_GRP2_INTR_BID_ENABLE); > + > + mask = ((1 << cpu) | (1 << (cpu+8))); What does 8 stands for? > + > + reg = readl(base + GS101_GRP1_INTR_BID_UPEND) & mask; > + writel(reg & mask, base + GS101_GRP1_INTR_BID_CLEAR); > + > + return 0; > +} > + > static int exynos_pmu_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > @@ -377,6 +426,28 @@ static int exynos_pmu_probe(struct platform_device *pdev) > pmu_context->pmureg = regmap; > pmu_context->dev = dev; > > + if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_cpuhp) { > + Drop blank line > + pmu_context->pmuintrgen_base = > + devm_platform_ioremap_resource_byname(pdev, "pmu-intr-gen"); > + /* > + * To maintain support for older DTs that didn't specify pmu-intr-gen > + * register region, just issue a warning rather than fail to probe. > + */ > + if (IS_ERR(pmu_context->pmuintrgen_base)) { > + dev_warn(&pdev->dev, > + "failed to map pmu-intr-gen registers\n"); Test old DTS, I think you do write() to the ERR_PTR when offlining/onlining... > + } else { > + cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, > + "soc/exynos-pmu:prepare", > + cpuhp_pmu_online, NULL); > + > + cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, > + "soc/exynos-pmu:online", > + NULL, cpuhp_pmu_offline); > + } > + } > + > if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init) > pmu_context->pmu_data->pmu_init(); > Best regards, Krzysztof