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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 6B865C432C1 for ; Tue, 24 Sep 2019 16:41:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 41E5D217F4 for ; Tue, 24 Sep 2019 16:41:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343314; bh=rVZbbjAhkHux7zJ+PirVH6htCfn1dxxVKBY20QsjSAI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gCnT4ME++aQjIZb1u12KQ0yGaigsnu/33n93CKxyqIr2HjQSkQbLPfWXjdR1V3ygA cplG1DUs2+Z0BD72RF/9SnGDiZrzMeNYh6t2NQ5Zr02cp9jY43kKCUzEWbI7kfC3K4 lwKzWjFWPEzec8ShbY17HgvNF4ydHEFJmVEjYvPc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387883AbfIXQlu (ORCPT ); Tue, 24 Sep 2019 12:41:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:57770 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391096AbfIXQlt (ORCPT ); Tue, 24 Sep 2019 12:41:49 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C16C421655; Tue, 24 Sep 2019 16:41:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343309; bh=rVZbbjAhkHux7zJ+PirVH6htCfn1dxxVKBY20QsjSAI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZK2RbNdNnot6dnLUUKbXymYLcK2ObCdoaAzkWj5Bo7oRh1qpTjmnLg8/zMfHVze54 rXkVs+c3NkQl27C8fagUr2MAHPUseTVaDVhYcif+O2QsgI+9rT7tmP9oEWXSDHFioQ FQVhKyyeVVLvmoEZkHetbQKL0Gkdcp29+cNPLD8Y= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andrey Smirnov , Andrzej Hajda , Tomi Valkeinen , Laurent Pinchart , Andrey Gusakov , Philipp Zabel , Cory Tusar , Chris Healy , Lucas Stach , dri-devel@lists.freedesktop.org, Sasha Levin Subject: [PATCH AUTOSEL 5.3 03/87] drm/bridge: tc358767: Increase AUX transfer length limit Date: Tue, 24 Sep 2019 12:40:19 -0400 Message-Id: <20190924164144.25591-3-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190924164144.25591-1-sashal@kernel.org> References: <20190924164144.25591-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andrey Smirnov [ Upstream commit e0655feaec62d5139b6b13a7b1bbb1ab8f1c2d83 ] According to the datasheet tc358767 can transfer up to 16 bytes via its AUX channel, so the artificial limit of 8 appears to be too low. However only up to 15-bytes seem to be actually supported and trying to use 16-byte transfers results in transfers failing sporadically (with bogus status in case of I2C transfers), so limit it to 15. Signed-off-by: Andrey Smirnov Reviewed-by: Andrzej Hajda Reviewed-by: Tomi Valkeinen Cc: Andrzej Hajda Cc: Laurent Pinchart Cc: Tomi Valkeinen Cc: Andrey Gusakov Cc: Philipp Zabel Cc: Cory Tusar Cc: Chris Healy Cc: Lucas Stach Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrzej Hajda Link: https://patchwork.freedesktop.org/patch/msgid/20190619052716.16831-9-andrew.smirnov@gmail.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/tc358767.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 13ade28a36a8a..b3a7d5f1250c8 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -313,7 +313,7 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { struct tc_data *tc = aux_to_tc(aux); - size_t size = min_t(size_t, 8, msg->size); + size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); u8 request = msg->request & ~DP_AUX_I2C_MOT; u8 *buf = msg->buffer; u32 tmp = 0; -- 2.20.1