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 X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 355DBC352A2 for ; Thu, 6 Feb 2020 09:12:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C6F0206CC for ; Thu, 6 Feb 2020 09:12:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728335AbgBFJM2 (ORCPT ); Thu, 6 Feb 2020 04:12:28 -0500 Received: from alexa-out-blr-01.qualcomm.com ([103.229.18.197]:3864 "EHLO alexa-out-blr-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727848AbgBFJM1 (ORCPT ); Thu, 6 Feb 2020 04:12:27 -0500 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by alexa-out-blr-01.qualcomm.com with ESMTP/TLS/AES256-SHA; 06 Feb 2020 14:42:24 +0530 Received: from harigovi-linux.qualcomm.com ([10.204.66.157]) by ironmsg02-blr.qualcomm.com with ESMTP; 06 Feb 2020 14:42:04 +0530 Received: by harigovi-linux.qualcomm.com (Postfix, from userid 2332695) id 54F7C28E6; Thu, 6 Feb 2020 14:42:03 +0530 (IST) From: Harigovindan P To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org Cc: Harigovindan P , linux-kernel@vger.kernel.org, robdclark@gmail.com, seanpaul@chromium.org, hoegsberg@chromium.org, kalyan_t@codeaurora.org, nganji@codeaurora.org Subject: [v1] drm/msm/dsi/pll: call vco set rate explicitly Date: Thu, 6 Feb 2020 14:42:01 +0530 Message-Id: <1580980321-19256-1-git-send-email-harigovi@codeaurora.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For a given byte clock, if VCO recalc value is exactly same as vco set rate value, vco_set_rate does not get called assuming VCO is already set to required value. But Due to GDSC toggle, VCO values are erased in the HW. To make sure VCO is programmed correctly, we forcefully call set_rate from vco_prepare. Signed-off-by: Harigovindan P --- Changes in v1: - Calling set rate from vco_prepare drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c index 1c89454..6ac04fc 100644 --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c @@ -411,6 +411,12 @@ static int dsi_pll_10nm_vco_prepare(struct clk_hw *hw) if (pll_10nm->slave) dsi_pll_enable_pll_bias(pll_10nm->slave); + rc = dsi_pll_10nm_vco_set_rate(hw,pll_10nm->vco_current_rate, 0); + if (rc) { + pr_err("vco_set_rate failed, rc=%d\n", rc); + return rc; + } + /* Start PLL */ pll_write(pll_10nm->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_PLL_CNTRL, 0x01); -- 2.7.4