From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E7291FAEE3; Wed, 6 Nov 2024 12:51:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730897518; cv=none; b=UHOLdjSAGvj4xiiIrQXCIxX6t4Hu61ln7rEisEzBPMyq2lqCK1V75PdJCJP/XG+E+JJAiiRmlXnmQfTCPN+V1hBNpimqoIi5h/tvMuk3bT0ytdl3x72HSYmDQygP6HgTTJmBIB5bG+SIE+qdJWQmsTDeE3jov9m3xhOGJeWrYS4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730897518; c=relaxed/simple; bh=TusA2tcn/P/W9OaVQDs8NryzY7kRpxuuBZE+d7cY588=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IGDBznsfa0qkFCH0lacBIz+/rzzFk6Lac9fEIm8mmt5yIvRHsnw1dTfNAY7f/X7JiBWEwJZI2PReexihAHk7TmBaHP3VxHI/wJ/TrxaNpFEJCQHAyd5UrURzvst2z/4F/K4eouwJhscCd4Bx6ktGz47AD6dHTv+6UCE5rcQT4yU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xBrKnJWA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xBrKnJWA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24D4DC4CED3; Wed, 6 Nov 2024 12:51:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730897518; bh=TusA2tcn/P/W9OaVQDs8NryzY7kRpxuuBZE+d7cY588=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xBrKnJWANsROGq2zTVQNZ7wDfcjH25jUmt+v1j+lRz8cu7vq14vCxjfRXyrWiVMFI Xs9bScqGOHMIPMA2Q8NaGPsnwlRVRZHaX3w2cEB+1s98Y/sEmCGxcJrqGeA4VCPj/1 gC2INEJM8143DtBp/+rkq81l/WC/FA0Hgw8wUKR4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Marcello Sylvester Bauer , Marcello Sylvester Bauer , Sasha Levin Subject: [PATCH 6.6 073/151] usb: gadget: dummy_hcd: Set transfer interval to 1 microframe Date: Wed, 6 Nov 2024 13:04:21 +0100 Message-ID: <20241106120310.858725062@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120308.841299741@linuxfoundation.org> References: <20241106120308.841299741@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marcello Sylvester Bauer [ Upstream commit 0a723ed3baa941ca4f51d87bab00661f41142835 ] Currently, the transfer polling interval is set to 1ms, which is the frame rate of full-speed and low-speed USB. The USB 2.0 specification introduces microframes (125 microseconds) to improve the timing precision of data transfers. Reducing the transfer interval to 1 microframe increases data throughput for high-speed and super-speed USB communication Signed-off-by: Marcello Sylvester Bauer Signed-off-by: Marcello Sylvester Bauer Link: https://lore.kernel.org/r/6295dbb84ca76884551df9eb157cce569377a22c.1712843963.git.sylv@sylv.io Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/gadget/udc/dummy_hcd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c index dab559d8ee8ca..f37b0d8386c1a 100644 --- a/drivers/usb/gadget/udc/dummy_hcd.c +++ b/drivers/usb/gadget/udc/dummy_hcd.c @@ -50,6 +50,8 @@ #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ #define POWER_BUDGET_3 900 /* in mA */ +#define DUMMY_TIMER_INT_NSECS 125000 /* 1 microframe */ + static const char driver_name[] = "dummy_hcd"; static const char driver_desc[] = "USB Host+Gadget Emulator"; @@ -1302,7 +1304,7 @@ static int dummy_urb_enqueue( /* kick the scheduler, it'll do the rest */ if (!hrtimer_active(&dum_hcd->timer)) - hrtimer_start(&dum_hcd->timer, ms_to_ktime(1), HRTIMER_MODE_REL); + hrtimer_start(&dum_hcd->timer, ns_to_ktime(DUMMY_TIMER_INT_NSECS), HRTIMER_MODE_REL); done: spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); @@ -1993,7 +1995,7 @@ static enum hrtimer_restart dummy_timer(struct hrtimer *t) dum_hcd->udev = NULL; } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { /* want a 1 msec delay here */ - hrtimer_start(&dum_hcd->timer, ms_to_ktime(1), HRTIMER_MODE_REL); + hrtimer_start(&dum_hcd->timer, ns_to_ktime(DUMMY_TIMER_INT_NSECS), HRTIMER_MODE_REL); } spin_unlock_irqrestore(&dum->lock, flags); -- 2.43.0