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 6CC1D1EC00E; Wed, 6 Nov 2024 12:44:51 +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=1730897091; cv=none; b=F4AMdOhC6hZW/7U3VUxG3uQs1kv9QMiCehfRPdvdc3nHiMxbxr6GbIvyq8xWoxpjHGyc6YlM/Ix6DECCxMthDaTPcoxAY14G1pYzLjSmu9MZXvuqbKJpHCHFLGULmCu960FhNW+P8/65thmYXac0EaEygcRmEFZElnoSF/B//N0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730897091; c=relaxed/simple; bh=pPzeuPjorpWpwOvl92GfV6AZ+QWUY5u3rGLMWXxTBK4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QJsVSHMvFffHsQsFNhev1thAZXqOqoDj3LiHSNZXLMCWAG1fxxDRiC0fZAr3fs6inKaGKEFDyAGJE1O+CGdtuWKN7N9aYaAhnP423AfS+zcUKR3lf83OiEJEsGlPmMdRhKlLjcTEbNQrOOjDRbI7xsMgtNf10gfQP1vUNDiQEPA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0xBhpcyg; 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="0xBhpcyg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1BBAC4CECD; Wed, 6 Nov 2024 12:44:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730897091; bh=pPzeuPjorpWpwOvl92GfV6AZ+QWUY5u3rGLMWXxTBK4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0xBhpcygTUWCEfpv2FD30+B+PkvBEfu6IpPZIz9cStHJBhCSuehRy/NQox0ACJOYp /NfGxieZi2XOgV6hltkzQ+gnotrec4DyEk3jAwZAbrGxB/wUwDCbt7EcNZDyKThUNy 0ai8BWtbQ7RXoPQqST5m3lrmXzIPi3MFQZUskxyw= 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 6.1 062/126] usb: gadget: dummy_hcd: Set transfer interval to 1 microframe Date: Wed, 6 Nov 2024 13:04:23 +0100 Message-ID: <20241106120307.770826012@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120306.038154857@linuxfoundation.org> References: <20241106120306.038154857@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-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 4f9c6e86456fe..32a03de215d37 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"; @@ -1303,7 +1305,7 @@ 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); @@ -1994,7 +1996,7 @@ 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