From patchwork Thu Oct 3 20:50:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Warren X-Patchwork-Id: 11173347 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0B7F41709 for ; Thu, 3 Oct 2019 20:50:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF07A215EA for ; Thu, 3 Oct 2019 20:50:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731656AbfJCUuk (ORCPT ); Thu, 3 Oct 2019 16:50:40 -0400 Received: from avon.wwwdotorg.org ([104.237.132.123]:50500 "EHLO avon.wwwdotorg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726669AbfJCUuk (ORCPT ); Thu, 3 Oct 2019 16:50:40 -0400 Received: from swarren-lx1.nvidia.com (unknown [216.228.112.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by avon.wwwdotorg.org (Postfix) with ESMTPSA id 3AF0A1C10A8; Thu, 3 Oct 2019 14:50:39 -0600 (MDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.100.3 at avon.wwwdotorg.org From: Stephen Warren To: Thierry Reding , Jonathan Hunter , Peter De Schrijver , Prashant Gaikwad Cc: Michael Turquette , Stephen Boyd , linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH V3 4/4] ARM: tegra: use clk_m CPU on Tegra124 LP1 resume Date: Thu, 3 Oct 2019 14:50:33 -0600 Message-Id: <20191003205033.98381-4-swarren@wwwdotorg.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003205033.98381-1-swarren@wwwdotorg.org> References: <20191003205033.98381-1-swarren@wwwdotorg.org> MIME-Version: 1.0 X-NVConfidentiality: public Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org From: Stephen Warren Configure the clock controller to set an alternate clock for the CPU when it receives an IRQ during LP1 (system suspend). Specifically, use clk_m (the crystal) rather than clk_s (a 32KHz clock). Such an IRQ will be the LP1 wake event. This reduces the amount of time taken to resume from LP1. NVIDIA's downstream kernel executes this code on both Tegra30 and Tegra124, so it appears OK to make this change unconditionally. Signed-off-by: Stephen Warren --- v3: No change. v2: No change. --- arch/arm/mach-tegra/sleep-tegra30.S | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index 6191f9456288..ba5e9c07d1b6 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -670,8 +670,12 @@ tegra30_switch_cpu_to_clk32k: pll_iddq_entry r1, r5, CLK_RESET_PLLX_MISC3, CLK_RESET_PLLX_MISC3_IDDQ _no_pll_in_iddq: - /* switch to CLKS */ - mov r0, #0 /* brust policy = 32KHz */ + /* + * Switch to clk_s (32KHz); bits 28:31=0 + * Enable burst on CPU IRQ; bit 24=1 + * Set IRQ burst clock source to clk_m; bits 10:8=0 + */ + mov r0, #(1 << 24) str r0, [r5, #CLK_RESET_SCLK_BURST] ret lr