From patchwork Fri Oct 30 15:12:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 11870025 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 18DB9697 for ; Fri, 30 Oct 2020 15:12:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2E652075E for ; Fri, 30 Oct 2020 15:12:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="Tqb7O5kk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726674AbgJ3PMN (ORCPT ); Fri, 30 Oct 2020 11:12:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725975AbgJ3PMN (ORCPT ); Fri, 30 Oct 2020 11:12:13 -0400 Received: from mail-lj1-x242.google.com (mail-lj1-x242.google.com [IPv6:2a00:1450:4864:20::242]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7AE7C0613D2 for ; Fri, 30 Oct 2020 08:12:12 -0700 (PDT) Received: by mail-lj1-x242.google.com with SMTP id m16so7263379ljo.6 for ; Fri, 30 Oct 2020 08:12:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HmLApEco+rX8mEQowG+X3JrxaqslQdNzajS3RXlAwc4=; b=Tqb7O5kk3DsDfwbCyi/N62cSbTRuKTlWvRDOrRX0UK94p5yx2nykHIfq3F83pRzD4m CBnP5gDVH25wtvfCi2WXDdN2Y+eGpbOa0UF6EClN/a1EuS4jsF8amYFS5Y2QOlKWJ8tf VVZ7wxL1YgWLRwqKaSWmI2CfH1+lxGwoUixJXMmCe7NxnpYilaBe5ufBKlnUFNXwoSFj cFzuMsujm6jKIJR5jMaRCwoEfh3YTFGu36xe8FEkz4RHLMCqMOQ7h0CeAuu107yf6ngb 06ijysHFIcmX9g4KNx9rK3vmkRombtOQhaPt+MzK9H4TG7Wn93OGrQ8027CBTkEV2wZO T4BQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=HmLApEco+rX8mEQowG+X3JrxaqslQdNzajS3RXlAwc4=; b=CthlzXrDpPiHoCb38iGRn0x6llusOzyZeCnngzB2sQ8a53d8jFPI1jNryNEUbv7PZf PF8Fh8HMb0B1wWscA2Khc3BONfj3D8rML2GTfEAjgHK7JFeyTFufroSg+q8Cbx6UGpBa fdUD25DBb13QSSoUD1tPjU+c3hiM/E7YBTikG2Ms5+w8SRTgyFY5JPj64OaYXkomdMdb B+Kfhw0q8Pq2+VDw+bZHxCBPYl36/mPBABBHqRcyAEpqJTRGmX/6zZH6oDQSlPtBNeRB ZbHJBKE92PwPD00NYm7aX/UoNGAVNb1ImySL2s8xHWAmDIgk7437Twl+ifihwiSfay2w P43g== X-Gm-Message-State: AOAM533Q0BFTHiw3VHh+YU9k9MwBsFvwb5ZbtEQmMwbAZKOL5xcHqxgt CmAblELCNxLEqBlWzFQR6rlFNg== X-Google-Smtp-Source: ABdhPJz8Jf3qUgHHL0oIhqFyjGJF47n865tCXisEWtPQ4NvvEiiPTNTUXmZA8itu60q/kdRV0TymxA== X-Received: by 2002:a05:651c:1139:: with SMTP id e25mr1238791ljo.63.1604070731032; Fri, 30 Oct 2020 08:12:11 -0700 (PDT) Received: from eriador.lan ([188.162.64.225]) by smtp.gmail.com with ESMTPSA id l16sm647269lfe.78.2020.10.30.08.12.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2020 08:12:10 -0700 (PDT) From: Dmitry Baryshkov To: benl-kernelpatches@squareup.com Cc: airlied@linux.ie, benl@squareup.com, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, harigovi@codeaurora.org, kholk11@gmail.com, konradybcio@gmail.com, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, robdclark@gmail.com, sean@poorly.run, zhengbin13@huawei.com Subject: [PATCH] drm/msm/dsi: do not try reading 28nm vco rate if it's not enabled Date: Fri, 30 Oct 2020 18:12:07 +0300 Message-Id: <20201030151207.766857-1-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <010101750064e17e-3db0087e-fc37-494d-aac9-2c2b9b0a7c5b-000000@us-west-2.amazonses.com> References: <010101750064e17e-3db0087e-fc37-494d-aac9-2c2b9b0a7c5b-000000@us-west-2.amazonses.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Reading VCO rate for this PLL can cause boot stalls, if it is not enabled. Guard clk_hw_get_rate with a call to dsi_pll_28nm_clk_is_enabled(). Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c index 6dffd7f4a99b..37a1f996a588 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c @@ -447,7 +447,10 @@ static void dsi_pll_28nm_save_state(struct msm_dsi_pll *pll) cached_state->postdiv1 = pll_read(base + REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG); cached_state->byte_mux = pll_read(base + REG_DSI_28nm_PHY_PLL_VREG_CFG); - cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw); + if (dsi_pll_28nm_clk_is_enabled(&pll->clk_hw)) + cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw); + else + cached_state->vco_rate = 0; } static int dsi_pll_28nm_restore_state(struct msm_dsi_pll *pll)