From patchwork Mon Mar 22 03:01:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12153517 X-Patchwork-Delegate: kieran@bingham.xyz 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 81EA3C433E3 for ; Mon, 22 Mar 2021 03:03:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 57C786195F for ; Mon, 22 Mar 2021 03:03:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229991AbhCVDCw (ORCPT ); Sun, 21 Mar 2021 23:02:52 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:35456 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbhCVDCY (ORCPT ); Sun, 21 Mar 2021 23:02:24 -0400 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 09B2F1025; Mon, 22 Mar 2021 04:02:18 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1616382139; bh=v1B2NZGFeIQk1d26ZpRXPBNZXiCp5x5dLUlFUdNh+Sg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p3uvGWxbTBq+a4MSM4v80LTMRjop17rOyjAtNRCykg5sBWCZd9xWFuxHLDdBWnjcH WX1zR6tMFWDRIAfEBU4moxH8Aw4Jv/DxMQznWXotvKloTd6OKEK3/RwYeF/EWDt6re t8ntu7bjKnQabNk20i70aSLpfLPxGAQvzxvDYEwA= From: Laurent Pinchart To: dri-devel@lists.freedesktop.org Cc: linux-renesas-soc@vger.kernel.org, Andrzej Hajda , Neil Armstrong , Jonas Karlman , Jernej Skrabec , Douglas Anderson , Stephen Boyd Subject: [RFC PATCH 04/11] drm/bridge: ti-sn65dsi86: Use bitmask to store valid rates Date: Mon, 22 Mar 2021 05:01:21 +0200 Message-Id: <20210322030128.2283-5-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.28.1 In-Reply-To: <20210322030128.2283-1-laurent.pinchart+renesas@ideasonboard.com> References: <20210322030128.2283-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org The valid rates are stored in an array of 8 booleans. Replace it with a bitmask to save space. Signed-off-by: Laurent Pinchart Reviewed-by: Stephen Boyd Reviewed-by: Douglas Anderson --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index c45420a50e73..1d1be791d5ba 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -557,9 +557,9 @@ static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn_bridge *pdata) return i; } -static void ti_sn_bridge_read_valid_rates(struct ti_sn_bridge *pdata, - bool rate_valid[]) +static unsigned int ti_sn_bridge_read_valid_rates(struct ti_sn_bridge *pdata) { + unsigned int valid_rates = 0; unsigned int rate_per_200khz; unsigned int rate_mhz; u8 dpcd_val; @@ -599,13 +599,13 @@ static void ti_sn_bridge_read_valid_rates(struct ti_sn_bridge *pdata, j < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); j++) { if (ti_sn_bridge_dp_rate_lut[j] == rate_mhz) - rate_valid[j] = true; + valid_rates |= BIT(j); } } for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); i++) { - if (rate_valid[i]) - return; + if (valid_rates & BIT(i)) + return valid_rates; } DRM_DEV_ERROR(pdata->dev, "No matching eDP rates in table; falling back\n"); @@ -627,15 +627,17 @@ static void ti_sn_bridge_read_valid_rates(struct ti_sn_bridge *pdata, (int)dpcd_val); fallthrough; case DP_LINK_BW_5_4: - rate_valid[7] = 1; + valid_rates |= BIT(7); fallthrough; case DP_LINK_BW_2_7: - rate_valid[4] = 1; + valid_rates |= BIT(4); fallthrough; case DP_LINK_BW_1_62: - rate_valid[1] = 1; + valid_rates |= BIT(1); break; } + + return valid_rates; } static void ti_sn_bridge_set_video_timings(struct ti_sn_bridge *pdata) @@ -753,8 +755,8 @@ static int ti_sn_link_training(struct ti_sn_bridge *pdata, int dp_rate_idx, static void ti_sn_bridge_enable(struct drm_bridge *bridge) { struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge); - bool rate_valid[ARRAY_SIZE(ti_sn_bridge_dp_rate_lut)] = { }; const char *last_err_str = "No supported DP rate"; + unsigned int valid_rates; int dp_rate_idx; unsigned int val; int ret = -EINVAL; @@ -793,13 +795,13 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG, DP_NUM_LANES_MASK, val); - ti_sn_bridge_read_valid_rates(pdata, rate_valid); + valid_rates = ti_sn_bridge_read_valid_rates(pdata); /* Train until we run out of rates */ for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata); dp_rate_idx < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); dp_rate_idx++) { - if (!rate_valid[dp_rate_idx]) + if (!(valid_rates & BIT(dp_rate_idx))) continue; ret = ti_sn_link_training(pdata, dp_rate_idx, &last_err_str);