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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 E58BAC43461 for ; Sun, 2 May 2021 14:06:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C98C3613ED for ; Sun, 2 May 2021 14:06:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233336AbhEBOGv (ORCPT ); Sun, 2 May 2021 10:06:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:50986 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233319AbhEBOGO (ORCPT ); Sun, 2 May 2021 10:06:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C967D613C4; Sun, 2 May 2021 14:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619964322; bh=/sahYzojtlrTQWRIX61Qo06k9qjoOZfkW6tCFKytgg4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=icwxAm8bSY80RON+4DZB+9l2TdAdlF+H3wA8QIvhMVh+Y3lKrrggi6OCYDoAVM0m7 nz1u8z8AEIqZJ+MtAXCQxcF9SGBW/7MMOLvs4K6fb+iwVgd2GNJSCq/kdZXW8mHxKL Y4ETbU5omLbWK+q7TQB5P6tEOcv7rMfb447M/kBQCbUnBHVeZHbLBQlg2IQsRuJVnk kG1AOBet9RSj7v6KqysBsk/Ysuz/fw8OCDEVsUHF+Kj/ux2cHmuF8rMO3mlb0ypKml fSfwhLvHuJeWF/4Ex8pUWH3JzjHRi/NxRXMt7L6T9ftDK/w366VTi9oSPkI09lo45k 2S8JKyHSjDUuA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pawel Laszczak , Peter Chen , Laurent Pinchart , Greg Kroah-Hartman , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 03/21] usb: gadget: uvc: add bInterval checking for HS mode Date: Sun, 2 May 2021 10:04:59 -0400 Message-Id: <20210502140517.2719912-3-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210502140517.2719912-1-sashal@kernel.org> References: <20210502140517.2719912-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Pawel Laszczak [ Upstream commit 26adde04acdff14a1f28d4a5dce46a8513a3038b ] Patch adds extra checking for bInterval passed by configfs. The 5.6.4 chapter of USB Specification (rev. 2.0) say: "A high-bandwidth endpoint must specify a period of 1x125 µs (i.e., a bInterval value of 1)." The issue was observed during testing UVC class on CV. I treat this change as improvement because we can control bInterval by configfs. Reviewed-by: Peter Chen Reviewed-by: Laurent Pinchart Signed-off-by: Pawel Laszczak Link: https://lore.kernel.org/r/20210308125338.4824-1-pawell@gli-login.cadence.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/gadget/function/f_uvc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index d8ce7868fe22..169e73ed128c 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -645,7 +645,12 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f) uvc_hs_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11)); - uvc_hs_streaming_ep.bInterval = opts->streaming_interval; + + /* A high-bandwidth endpoint must specify a bInterval value of 1 */ + if (max_packet_mult > 1) + uvc_hs_streaming_ep.bInterval = 1; + else + uvc_hs_streaming_ep.bInterval = opts->streaming_interval; uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size); uvc_ss_streaming_ep.bInterval = opts->streaming_interval; -- 2.30.2