From patchwork Tue Mar 19 10:41:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 160553 Delivered-To: patch@linaro.org Received: by 2002:a02:5cc1:0:0:0:0:0 with SMTP id w62csp3711985jad; Tue, 19 Mar 2019 03:42:47 -0700 (PDT) X-Google-Smtp-Source: APXvYqzbNT2QZ6/fI7RjxZUpAiSRoQH2gIz0jttoRmnduF5YjFhwAsgpErwOUvqyTAnFERZ/S0S/ X-Received: by 2002:a65:51c2:: with SMTP id i2mr1172555pgq.295.1552992167603; Tue, 19 Mar 2019 03:42:47 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1552992167; cv=none; d=google.com; s=arc-20160816; b=kbXmDgmjRTCx18NPa8vRnALweFx71JalgSjHW+athQiCtBl5JBEiYKeHZFaqElJNC6 7cR3HBkHjgRqSw16hDL/hIxS/q6u0EEEjJKdMBBTUZOu7jDHi1lW3ZrZ/ugikwg74Qmx 1AV3F0C3SrXj6oQVwpHpifcC/3LyLxOqRgBV4iwCivg947aafIlM3y68HNdTp+56iOaf MFmA5DnxWZp9aQBv5DBaIefhjLncKmR38TVPOepS4pGmrLqvqawt75D0oeYv1I10SoW5 iitpligyEapIydSnp+IYLxZLLbBJBIiqt4XowBPZlAYs+R7/wOAd7hlHMY0ZEtVIF+4M zdIg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:cc:list-subscribe :list-help:list-post:list-archive:list-unsubscribe:list-id :precedence:mime-version:references:in-reply-to:message-id:date :subject:to:from:delivered-to; bh=JhDp74T30t/V3WmVoRb4z4TOKwW0DrKUaRkLqfkMwrs=; b=aoYbt6hbUiBJWWLGKHguOU0iHgbL1OEn/m0GojPht3ngamDoFDCSlsh4v7If4tq5hQ aVEv0GhMjwDhmjdOxWlMyeKqC8mkKTz4XithbMjgwJo3mZfqCQXNPeg5dAJShRTHzANX Se+t9p9AxPLXlGd33ICa6UNT/zpswYdbfscdvHZSycNEvCYYlt2p2SMgccdEhFGIoKKi okJMiLN1SjC9Q1eFstxkUSK8mYIGYE30h9NItRI/pjKfLRC3qzJlKUozS+lzjnfJo0Gf Xvo2rD5EuPFH0HUWPDyj31PoCBk187COs1zvQUFpANRZmr2S4dTnJDmD1zGoa7rQiMan BlfQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from gabe.freedesktop.org (gabe.freedesktop.org. [131.252.210.177]) by mx.google.com with ESMTPS id r10si4183980plo.268.2019.03.19.03.42.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 19 Mar 2019 03:42:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) client-ip=131.252.210.177; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of dri-devel-bounces@lists.freedesktop.org designates 131.252.210.177 as permitted sender) smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org; dmarc=fail (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C733F89AB6; Tue, 19 Mar 2019 10:42:44 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by gabe.freedesktop.org (Postfix) with ESMTPS id BCDC889AA6 for ; Tue, 19 Mar 2019 10:42:39 +0000 (UTC) Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x2JAgbWU068579; Tue, 19 Mar 2019 05:42:37 -0500 Received: from DFLE100.ent.ti.com (dfle100.ent.ti.com [10.64.6.21]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x2JAgb74023860 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 19 Mar 2019 05:42:37 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 19 Mar 2019 05:42:36 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5 via Frontend Transport; Tue, 19 Mar 2019 05:42:37 -0500 Received: from deskari.lan (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id x2JAfxlY019091; Tue, 19 Mar 2019 05:42:34 -0500 From: Tomi Valkeinen To: Andrzej Hajda , Laurent Pinchart , , Lucas Stach , Andrey Gusakov , Philipp Zabel , Jyri Sarha , Peter Ujfalusi , Benoit Parrot Subject: [PATCH 15/21] drm/bridge: tc358767: clean-up link training Date: Tue, 19 Mar 2019 12:41:08 +0200 Message-ID: <20190319104114.12077-16-tomi.valkeinen@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190319104114.12077-1-tomi.valkeinen@ti.com> References: <20190319104114.12077-1-tomi.valkeinen@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1552992157; bh=obAY8AyHfzzWP8mtXrDAZNmMCcmZJ9004aENP2tc+g4=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=gMKSThnJ4wDvAgHvf2QYCWdZQQOspfctAYtfxGp1GBrrBE+oa4J4zC7UYJub8Fv5e 7Cb6JCcpOfO9KaYaPLBc4L9gqv6uF6VykE8aTscN2lqKfK5ZtSZlTTMYZ53hK817uy Ng/SXA3WS2WQaaDmTl1AhSe0a8SwooR7DhU6Nxao= X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tomi Valkeinen Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The current link training code does unnecessary retry-loops, and does extra writes to the registers. It is easier to follow the flow and ensure it's similar to Toshiba's documentation if we deal with LT inside tc_main_link_enable() function. This patch adds tc_wait_link_training() which handles waiting for the LT phase to finish, and does the necessary LT register setups in tc_main_link_enable, without extra loops. Signed-off-by: Tomi Valkeinen --- drivers/gpu/drm/bridge/tc358767.c | 129 +++++++++++++----------------- 1 file changed, 57 insertions(+), 72 deletions(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 220408db82f7..1c61f6205e43 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -740,83 +740,25 @@ static int tc_set_video_mode(struct tc_data *tc, return ret; } -static int tc_link_training(struct tc_data *tc, int pattern) +static int tc_wait_link_training(struct tc_data *tc, u32 *error) { - const char * const *errors; - u32 srcctrl = tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | - DP0_SRCCTRL_AUTOCORRECT; - int timeout; - int retry; + u32 timeout = 1000; u32 value; int ret; - if (pattern == DP_TRAINING_PATTERN_1) { - srcctrl |= DP0_SRCCTRL_TP1; - errors = training_pattern1_errors; - } else { - srcctrl |= DP0_SRCCTRL_TP2; - errors = training_pattern2_errors; - } - - /* Set DPCD 0x102 for Training Part 1 or 2 */ - tc_write(DP0_SNKLTCTRL, DP_LINK_SCRAMBLING_DISABLE | pattern); - - tc_write(DP0_LTLOOPCTRL, - (0x0f << 28) | /* Defer Iteration Count */ - (0x0f << 24) | /* Loop Iteration Count */ - (0x0d << 0)); /* Loop Timer Delay */ - - retry = 5; do { - /* Set DP0 Training Pattern */ - tc_write(DP0_SRCCTRL, srcctrl); - - /* Enable DP0 to start Link Training */ - tc_write(DP0CTL, DP_EN); - - /* wait */ - timeout = 1000; - do { - tc_read(DP0_LTSTAT, &value); - udelay(1); - } while ((!(value & LT_LOOPDONE)) && (--timeout)); - if (timeout == 0) { - dev_err(tc->dev, "Link training timeout!\n"); - } else { - int pattern = (value >> 11) & 0x3; - int error = (value >> 8) & 0x7; - - dev_dbg(tc->dev, - "Link training phase %d done after %d uS: %s\n", - pattern, 1000 - timeout, errors[error]); - if (pattern == DP_TRAINING_PATTERN_1 && error == 0) - break; - if (pattern == DP_TRAINING_PATTERN_2) { - value &= LT_CHANNEL1_EQ_BITS | - LT_INTERLANE_ALIGN_DONE | - LT_CHANNEL0_EQ_BITS; - /* in case of two lanes */ - if ((tc->link.base.num_lanes == 2) && - (value == (LT_CHANNEL1_EQ_BITS | - LT_INTERLANE_ALIGN_DONE | - LT_CHANNEL0_EQ_BITS))) - break; - /* in case of one line */ - if ((tc->link.base.num_lanes == 1) && - (value == (LT_INTERLANE_ALIGN_DONE | - LT_CHANNEL0_EQ_BITS))) - break; - } - } - /* restart */ - tc_write(DP0CTL, 0); - usleep_range(10, 20); - } while (--retry); - if (retry == 0) { - dev_err(tc->dev, "Failed to finish training phase %d\n", - pattern); + udelay(1); + tc_read(DP0_LTSTAT, &value); + } while ((!(value & LT_LOOPDONE)) && (--timeout)); + + if (timeout == 0) { + dev_err(tc->dev, "Link training timeout waiting for LT_LOOPDONE!\n"); + ret = -ETIMEDOUT; + goto err; } + *error = (value >> 8) & 0x7; + return 0; err: return ret; @@ -832,6 +774,7 @@ static int tc_main_link_enable(struct tc_data *tc) u32 value; int ret; u8 tmp[8]; + u32 error; /* display mode should be set at this point */ if (!tc->mode) @@ -950,14 +893,56 @@ static int tc_main_link_enable(struct tc_data *tc) if (ret < 0) goto err_dpcd_write; - ret = tc_link_training(tc, DP_TRAINING_PATTERN_1); + /* LINK TRAINING PATTERN 1 */ + + /* Set DPCD 0x102 for Training Pattern 1 */ + tc_write(DP0_SNKLTCTRL, DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1); + + tc_write(DP0_LTLOOPCTRL, + (15 << 28) | /* Defer Iteration Count */ + (15 << 24) | /* Loop Iteration Count */ + (0xd << 0)); /* Loop Timer Delay */ + + tc_write(DP0_SRCCTRL, tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | DP0_SRCCTRL_AUTOCORRECT | + DP0_SRCCTRL_TP1); + + /* Enable DP0 to start Link Training */ + tc_write(DP0CTL, + ((tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) ? EF_EN : 0) | + DP_EN); + + /* wait */ + ret = tc_wait_link_training(tc, &error); if (ret) goto err; - ret = tc_link_training(tc, DP_TRAINING_PATTERN_2); + if (error) { + dev_err(tc->dev, "Link training phase 1 failed: %s\n", + training_pattern1_errors[error]); + ret = -ENODEV; + goto err; + } + + /* LINK TRAINING PATTERN 2 */ + + /* Set DPCD 0x102 for Training Pattern 2 */ + tc_write(DP0_SNKLTCTRL, DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_2); + + tc_write(DP0_SRCCTRL, tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | DP0_SRCCTRL_AUTOCORRECT | + DP0_SRCCTRL_TP2); + + /* wait */ + ret = tc_wait_link_training(tc, &error); if (ret) goto err; + if (error) { + dev_err(tc->dev, "Link training phase 2 failed: %s\n", + training_pattern2_errors[error]); + ret = -ENODEV; + goto err; + } + /* Clear Training Pattern, set AutoCorrect Mode = 1 */ tc_write(DP0_SRCCTRL, tc_srcctrl(tc) | DP0_SRCCTRL_AUTOCORRECT);