From patchwork Wed Apr 1 00:30:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tanmay Shah X-Patchwork-Id: 11468511 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 1095C14B4 for ; Wed, 1 Apr 2020 00:31:39 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E30F120842 for ; Wed, 1 Apr 2020 00:31:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="oaVSCr3m" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E30F120842 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CDE5D6E8A7; Wed, 1 Apr 2020 00:31:37 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail26.static.mailgun.info (mail26.static.mailgun.info [104.130.122.26]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0647589DC2 for ; Wed, 1 Apr 2020 00:31:32 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1585701095; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=UpdspJl789wjTj3JPmIZuoeUl+3kUb8d/qYYk/wEhvo=; b=oaVSCr3mRC31NF21O2BK31go5mq3jzN3aNQ7cD0g2J+jtF/lQh/Yn7vkZIPVME2unblUJntM DOQp8XQLhIOEWF8243g43ykiXY+zywG29/4wBvD0bbAfAS0ztpWg+STtVqzeNhc1ABtD4tbE EnGbFjf0X6nr4Ppl3zzOMJmq6k0= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyJkOTU5ZSIsICJkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e83e0d8.7f510e88ee30-smtp-out-n04; Wed, 01 Apr 2020 00:31:20 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 7C1E9C4478F; Wed, 1 Apr 2020 00:31:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from displaysanity13-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: varar) by smtp.codeaurora.org (Postfix) with ESMTPSA id 09155C44788; Wed, 1 Apr 2020 00:31:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 09155C44788 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=tanmay@codeaurora.org From: Tanmay Shah To: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, seanpaul@chromium.org, swboyd@chromium.org Subject: [DPU PATCH v5 2/5] drm: add constant N value in helper file Date: Tue, 31 Mar 2020 17:30:28 -0700 Message-Id: <1585701031-28871-3-git-send-email-tanmay@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1585701031-28871-1-git-send-email-tanmay@codeaurora.org> References: <1585701031-28871-1-git-send-email-tanmay@codeaurora.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: abhinavk@codeaurora.org, hoegsberg@google.com, dri-devel@lists.freedesktop.org, Vara Reddy , aravindh@codeaurora.org, linux-clk@vger.kernel.org, Chandan Uddaraju MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Chandan Uddaraju The constant N value (0x8000) is used by multiple DP drivers. Define this value in header file and use this in the existing i915 display driver. Signed-off-by: Chandan Uddaraju Signed-off-by: Vara Reddy --- drivers/gpu/drm/i915/display/intel_display.c | 2 +- include/drm/drm_dp_helper.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index effc425..3c016f3 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -7618,7 +7618,7 @@ static void compute_m_n(unsigned int m, unsigned int n, * which the devices expect also in synchronous clock mode. */ if (constant_n) - *ret_n = 0x8000; + *ret_n = DP_LINK_CONSTANT_N_VALUE; else *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 51ecb51..b509e74 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1455,6 +1455,8 @@ static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, u8 status[DP_LINK_STATUS_SIZE]); +#define DP_LINK_CONSTANT_N_VALUE 0x8000 + int drm_dp_downstream_max_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], const u8 port_cap[4]); int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],