From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (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 C901527FD46; Tue, 12 Aug 2025 13:24:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755005099; cv=none; b=YkdxD09az0rUTUW68A1COnVB2rcGNQYnM9z2ISTOqAmOSRLgdvPsJCRcf9sUtccolYFfiAfmPSNROe/lc0oRFebxBbp/9IwEc1+tr9A6y7W9qPMaMq9aYktprhKsqlRjJIlc2LD3uHFRS0liPtyZvCprb5YGSEkjW1T9ey/AufA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755005099; c=relaxed/simple; bh=mTuIX/LJJ66fnhlHiVPxMpengPtS8Rmim9PTaSfsWuI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=pqMILj6KFs1pzwDdKCW6zF3fCBDZ9HHSCNIvBAhTicpg2tC9NU5mjMsH1BtcBFnUByyOprlfLszZeoC45uehFSpoJB3q5YtnMp6nnV6X7+Uze+m2lxtGXvu+zmMXk82kCM3EXPpA2yYVB3VEtfvegwwpXzMYQqo6oqFr03agLyE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=UB0VZK8X; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="UB0VZK8X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755005098; x=1786541098; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mTuIX/LJJ66fnhlHiVPxMpengPtS8Rmim9PTaSfsWuI=; b=UB0VZK8XN9AP8VHheu8Cq0MW7O48ihxMqebCQHNA8zaZ3l4O7Sz9FSlU 0C2bSQMj1VKzRsRQfmP9nAPbHejoIu5ebZC7ubtYyuIe4tldwviuJiJTc z5TL2lF8YHlus7PTn7yB1vXgTDRU0J7g2iQcpHRKHHDWXAMl+dp8ibWEY gI2a+MjH7IRIQuVJexQgsgNIR0P3ECh8fG5QXCpfM/XvvCWU0DvaDn89u uljiSKYee2yL6UNx8hCokWTO4LkDTUtZb2axwsAW8AolE4FXtlLW+vHlj 1JBdINRacFeVzkF3Ed3tooTaDiUmWngFLTTMUNmJmYSHoW6bBtgtmiu6P w==; X-CSE-ConnectionGUID: FPErh3VVRTeULr2G1QR+ZA== X-CSE-MsgGUID: 737TjNOYS6mpbXNGMC5XBA== X-IronPort-AV: E=McAfee;i="6800,10657,11520"; a="68349674" X-IronPort-AV: E=Sophos;i="6.17,284,1747724400"; d="scan'208";a="68349674" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2025 06:24:52 -0700 X-CSE-ConnectionGUID: COSzvyiCQ+a48nFDoXpINw== X-CSE-MsgGUID: k1nzq91UThCyfj0NohBCrw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,284,1747724400"; d="scan'208";a="166987269" Received: from bergbenj-mobl1.ger.corp.intel.com (HELO kekkonen.fi.intel.com) ([10.245.245.110]) by fmviesa010-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2025 06:24:48 -0700 Received: from punajuuri.localdomain (unknown [192.168.240.130]) by kekkonen.fi.intel.com (Postfix) with ESMTP id 2F65511FC4F; Tue, 12 Aug 2025 16:24:46 +0300 (EEST) Received: from sailus by punajuuri.localdomain with local (Exim 4.96) (envelope-from ) id 1uloze-00DMZt-03; Tue, 12 Aug 2025 16:24:46 +0300 Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo From: Sakari Ailus To: linux-usb@vger.kernel.org Cc: linux-media@vger.kernel.org, gregkh@linuxfoundation.org, laurent.pinchart@ideasonboard.com, hdegoede@redhat.com, Thinh.Nguyen@synopsys.com, Amardeep Rai , Kannappan R , Mathias Nyman , Alan Stern Subject: [PATCH v4 3/4] USB: Add a function to obtain USB version independent maximum bpi value Date: Tue, 12 Aug 2025 16:24:44 +0300 Message-Id: <20250812132445.3185026-4-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250812132445.3185026-1-sakari.ailus@linux.intel.com> References: <20250812132445.3185026-1-sakari.ailus@linux.intel.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: "Rai, Amardeep" Add usb_endpoint_max_isoc_bpi() to obtain maximum bytes per interval for isochronous endpoints in a USB version independent way. Signed-off-by: Rai, Amardeep Signed-off-by: Mathias Nyman Co-developed-by: Sakari Ailus Signed-off-by: Sakari Ailus Reviewed-by: Hans de Goede --- drivers/usb/core/usb.c | 32 ++++++++++++++++++++++++++++++++ include/linux/usb.h | 3 +++ 2 files changed, 35 insertions(+) diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index fca7735fc660..3e80a5b3e41b 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1110,6 +1110,38 @@ void usb_free_noncoherent(struct usb_device *dev, size_t size, } EXPORT_SYMBOL_GPL(usb_free_noncoherent); +/** + * usb_endpoint_max_isoc_bpi - Get maximum isochronous transfer bytes per interval + * @dev: The USB device + * @ep: The endpoint + * + * Returns: the maximum number of bytes isochronous endpoint @endpoint can + * transfer in during a service interval, or 0 for non-isochronous endpoints. + */ +u32 usb_endpoint_max_isoc_bpi(struct usb_device *dev, + const struct usb_host_endpoint *ep) +{ + if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_ISOC) + return 0; + + switch (dev->speed) { + case USB_SPEED_SUPER_PLUS: + if (USB_SS_SSP_ISOC_COMP(ep->ss_ep_comp.bmAttributes)) + return le32_to_cpu(ep->ssp_isoc_ep_comp.dwBytesPerInterval); + fallthrough; + case USB_SPEED_SUPER: + return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval); + case USB_SPEED_HIGH: + if (ep->eusb2_isoc_ep_comp.bDescriptorType && + !usb_endpoint_maxp(&ep->desc) && usb_endpoint_dir_in(&ep->desc)) + return le32_to_cpu(ep->eusb2_isoc_ep_comp.dwBytesPerInterval); + fallthrough; + default: + return usb_endpoint_maxp(&ep->desc) * usb_endpoint_maxp_mult(&ep->desc); + } +} +EXPORT_SYMBOL_GPL(usb_endpoint_max_isoc_bpi); + /* * Notifications of device and interface registration */ diff --git a/include/linux/usb.h b/include/linux/usb.h index 535ac37198a1..b38978abc3d6 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -2049,6 +2049,9 @@ static inline int usb_translate_errors(int error_code) } } +u32 usb_endpoint_max_isoc_bpi(struct usb_device *dev, + const struct usb_host_endpoint *ep); + /* Events from the usb core */ #define USB_DEVICE_ADD 0x0001 #define USB_DEVICE_REMOVE 0x0002 -- 2.39.5