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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 2BB39C10F14 for ; Sun, 6 Oct 2019 18:01:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F30AB2067B for ; Sun, 6 Oct 2019 18:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570384917; bh=KlSB4HBw84tIqwEJl/ZN5F7suGhn/NvkDm8CJqPjPb0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DKkZFN3us9yQ/+NWijpuEntavaGXhpwOTnD/qnR85ebSnTt1fYEPert6ou4eV3AVF KHfBcz3UVcCOLKERkz1pst7XzNewztb1/baifZJ5G9FyI8Z6pyY3SYmgw81GeCLMkz g/l0jO0iGAEL9uzx9Q4UP1rll+Lj7zeIMMdlszgM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728472AbfJFSB4 (ORCPT ); Sun, 6 Oct 2019 14:01:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:51454 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728263AbfJFR0V (ORCPT ); Sun, 6 Oct 2019 13:26:21 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 90B082077B; Sun, 6 Oct 2019 17:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570382781; bh=KlSB4HBw84tIqwEJl/ZN5F7suGhn/NvkDm8CJqPjPb0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oazCHXbnPqEadcW1M9plmFRnYV4MBcMCnZuyCm0qUIgCTyu2BpUR4fQOzsi4u+w7R SI5X/nP+SMd1TZdv4zwRrkiqictB7bXeuoYIKFtxDm01jyTh3ceQuAMFaau0+iOGjM 3jidb5rKdjMjpf3xc8vVy3Sa8RdRlWLBhnjVsO2Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, 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 4.14 04/68] drm/bridge: tc358767: Increase AUX transfer length limit Date: Sun, 6 Oct 2019 19:20:40 +0200 Message-Id: <20191006171110.124883581@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006171108.150129403@linuxfoundation.org> References: <20191006171108.150129403@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 9705ca197b90d..cefa2c1685ba4 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -300,7 +300,7 @@ 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