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 28AF3C4320D for ; Tue, 24 Sep 2019 16:51:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F203521BE5 for ; Tue, 24 Sep 2019 16:51:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343918; bh=WvrT+YqFB9XJFBgglofhWHy2h/WI6wolVdh3GnWYFJo=; h=From:To:Cc:Subject:Date:List-ID:From; b=z2y2AcOOivoi4y4LK9jk1Jj7fjENTmPJq/UMSyeOR4/JccCGopEbnwojmfk/OI4Dv CoLLRSBLI728ryqerTjgIoNFlYOag73TtyQp27viyEmbYzztxYe7VHUuMgaqP7Lmed ZKS6azeW+f5XhgcpEiFBwQ/K+UeWTiAUFqAbiDjM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2441566AbfIXQv5 (ORCPT ); Tue, 24 Sep 2019 12:51:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:44860 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2411053AbfIXQvd (ORCPT ); Tue, 24 Sep 2019 12:51:33 -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 5AD53217D9; Tue, 24 Sep 2019 16:51:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569343892; bh=WvrT+YqFB9XJFBgglofhWHy2h/WI6wolVdh3GnWYFJo=; h=From:To:Cc:Subject:Date:From; b=gvT11bcNB7afyAixKctZAYSTjXSoplc9yrbYGx0arhfF5cv4pYEz2/STuvLXqB5ny k91uwEbnZ5Hd0qs1owsJykmC8cgvACEcVDMCNi0IFAfIZH8Z4oiPgdKGBnUUgG4cgw aM0YywjnxnTK4kHRMJ1/sDHtgUOlumgxPamjuc6s= 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 4.9 01/19] drm/bridge: tc358767: Increase AUX transfer length limit Date: Tue, 24 Sep 2019 12:51:12 -0400 Message-Id: <20190924165130.28625-1-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 80993a8734e08..8b6f8fac92e89 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