From patchwork Tue Feb 6 18:43:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Konrad Dybcio X-Patchwork-Id: 13547697 Received: from mail-ej1-f44.google.com (mail-ej1-f44.google.com [209.85.218.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 19ED713FE2 for ; Tue, 6 Feb 2024 18:43:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707245026; cv=none; b=uF2fXNSICNAoR5+/ekam9NbbIoZ4qbx2psZS1vGLKhpnu0hUbi0UqHrWGXjNrR8FgzzhXEZzcrFdHS9hUPn+RdHSRZmGPwrlhZENY0C3p1bUfROL3PEJ1IiT75jrv6yl/zWKqHPElpXdjVw/DJheIr7PEX5toOJ9eX2PCskC9ms= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707245026; c=relaxed/simple; bh=XwCgSZpLR0e1PPyOXyw9iz+BwYBf4ZHexOSsfIVdxQU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CFCC/FIu9xfdVcGJhu2d33ky73F19nCQIhPI+c+vKop09Z03sDrrO+02rD88+luI76c4WWXXYR9N5hhC+tHzWf/Ed3oHTJGRq8/VpcIPo/bGl4/juQlcixUSRPkBuTVdpUDk/VMiqoxkxdO2SYoA2ZzcQLBvM7OpgYNdnrONgv4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=n88zmfA1; arc=none smtp.client-ip=209.85.218.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="n88zmfA1" Received: by mail-ej1-f44.google.com with SMTP id a640c23a62f3a-a2f79e79f0cso172256866b.2 for ; Tue, 06 Feb 2024 10:43:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1707245023; x=1707849823; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=hvL5qVc53pRM2ItjtrWEvKCgIea1KTM6jFEXiD2pTIk=; b=n88zmfA16tac3dTriWwFjbFeppDs3QCehS3dS9zYc6ISdsqi/+N7kYa8RVdk7PrG3V JHVd+fGdNvr8dYF/b3lZ2LuAvAn6vQ+ISxAHLRd3Td3dIzJCa4/JkqRtftbwRLg93Ja7 ZdS0iL/SaqjeHZcUVj73ubTEbWbev/8mPkFjJjJYDZZgwTOUS8/CzRIjCWEuE1bnBsvG HhJ1G8HZwFmObUd7znj6gCCXlBLzp1qdJijj8flCbLkXXIkTTart4jOJX2RJo9Il2atq ETVk+QWMQ6MzEJp6ZKJg6bhzjoejLap/VGQuG8QSPHKKh6R7C6P/q2fupy8BTqbVHnPN tFgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707245023; x=1707849823; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=hvL5qVc53pRM2ItjtrWEvKCgIea1KTM6jFEXiD2pTIk=; b=bkSCAI4TVriDzmJGXcZdTUBvx6VNp+9WDJkmkGDBfWzegR/DkJzuuTPMu7CJ4Wj16k 8c7KPA4DmDYiItHeyPrbxhaZ9AODptbpTr3G1eir1zuQQGcaVtimYQhoy/yHL6zUf/fD EpfDP7u0OHZ53faZKXTql5trJviL8Nz7Xh3eV4E2/d+ij5Kz8YGYnyPKpGAF1vt7iafY CfdEb7MHPS5bxAFvbiq5PaSgU5Xl3/sb5lW7SvWhxZKnCBNm1WTWQfJB+8w3IM5ckoex a6ZRWvRuZLOy4tnyQdU0QJYZRaJK6UAsNJIY55SqbX4Gh24OdM0JRCc/W4C9Cdh42EGN nPjg== X-Gm-Message-State: AOJu0Yxd0UIM/cX/rb5xDK54aJcvc2Nz5QAcTmFAHIRBmSdqbW/kxlH9 xpgv6/Gx43kA+3MYe06erOjtBFFMCsXnZRvX8fi8rp+QY8OwprNJ0JKwouImBio= X-Google-Smtp-Source: AGHT+IEwcGzkit3UG7RgaJhKZBhIWNsb1zukExW6YjVWP6FLguEvzUDQXDK8pJXm4ibakI9xGX20fA== X-Received: by 2002:a17:906:5290:b0:a31:83a2:463c with SMTP id c16-20020a170906529000b00a3183a2463cmr2821529ejm.34.1707245023306; Tue, 06 Feb 2024 10:43:43 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCWzBwgE40NoQJNzoN6JSw4Wjez8/Ag0DcojFpjommyB40AgMlUE/2XqAEx8GzyqQRu0n+Gf6BPPBtw0GJk5JHQhpqnm9wTanHLkqAFGNEu9StIqpimJ3LQ/bh/choLxc9xYvIslXMUyNrY61oIAjPhXTck3pQDC3OFqGLXAFx/TIN6rxWNRnLl80REIXNm+H3LWvFfoHxYHliZ1b9Cd6Z8qWIxWNz28bbjp874R4NzcK4HaJPXy8u14SqljSDsQrMCSy9WfeYwae54IR4lpNeZcjYCgKl0toBqdAzeEWdi5p6i08NE4A/IeL2gwgUisfg5IsdlgXA4KSzvf1vmfsL4BBtBTJbSf5KNssuSrsYrfPg3umt1i6MAG8r11TtQZdMAC35PIbJJgHuTLP0vc/N+7NYdxkR5syNN31BkE+v98az+z1IISEBMTlSD9hRllymVU34Asv/su Received: from [10.167.154.1] (037008245233.garwolin.vectranet.pl. [37.8.245.233]) by smtp.gmail.com with ESMTPSA id un9-20020a170907cb8900b00a384365e3b9sm562305ejc.195.2024.02.06.10.43.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Feb 2024 10:43:43 -0800 (PST) From: Konrad Dybcio Date: Tue, 06 Feb 2024 19:43:36 +0100 Subject: [PATCH v2 03/18] clk: qcom: reset: Ensure write completion on reset de/assertion Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240105-topic-venus_reset-v2-3-c37eba13b5ce@linaro.org> References: <20240105-topic-venus_reset-v2-0-c37eba13b5ce@linaro.org> In-Reply-To: <20240105-topic-venus_reset-v2-0-c37eba13b5ce@linaro.org> To: Bjorn Andersson , Michael Turquette , Stephen Boyd , Philipp Zabel Cc: Marijn Suijten , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Bryan O'Donoghue , Dikshita Agarwal , Vikash Garodia , Manivannan Sadhasivam , Konrad Dybcio X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1707245017; l=1253; i=konrad.dybcio@linaro.org; s=20230215; h=from:subject:message-id; bh=XwCgSZpLR0e1PPyOXyw9iz+BwYBf4ZHexOSsfIVdxQU=; b=Tq60ALVlciDLkdivYsIcmrQF748EJR+pUE1IufXNafFGsZuOAbb9f/rPSAB0nnwQSqzg3qqQb 6l7lLfFExgEDOXPfLnpXb/GSuu3ptYAHeuizJ30cBnCMswdh1J1/Bz5 X-Developer-Key: i=konrad.dybcio@linaro.org; a=ed25519; pk=iclgkYvtl2w05SSXO5EjjSYlhFKsJ+5OSZBjOkQuEms= Trying to toggle the resets in a rapid fashion can lead to the changes not actually arriving at the clock controller block when we expect them to. This was observed at least on SM8250. Read back the value after regmap_update_bits to ensure write completion. Fixes: db1029814f1f ("clk: qcom: reset: Ensure write completion on reset de/assertion") Signed-off-by: Konrad Dybcio --- drivers/clk/qcom/reset.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/clk/qcom/reset.c b/drivers/clk/qcom/reset.c index 20d1d35aaf22..d96c96a9089f 100644 --- a/drivers/clk/qcom/reset.c +++ b/drivers/clk/qcom/reset.c @@ -33,7 +33,12 @@ static int qcom_reset_set_assert(struct reset_controller_dev *rcdev, map = &rst->reset_map[id]; mask = map->bitmask ? map->bitmask : BIT(map->bit); - return regmap_update_bits(rst->regmap, map->reg, mask, assert ? mask : 0); + regmap_update_bits(rst->regmap, map->reg, mask, assert ? mask : 0); + + /* Read back the register to ensure write completion, ignore the value */ + regmap_read(rst->regmap, map->reg, &mask); + + return 0; } static int qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)