From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.18]) (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 64D7A277C88; Wed, 20 Aug 2025 14:38:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755700717; cv=none; b=OlhpAmIMVITUbC+7xW6hdrqcljs6IZeyOxvVnZq2CqNZyLd+HO+h8hrEmVoSEJlo4S0SVsETeyMdbZpVM75cCqp85M3VxwNE/nB5z7zlqt3Z4gk5GOuAAEFMeZlpW8Lw6UsutZeB0/cyIYT7iAJ2apKg3bZyTSNdmRT/dey8A/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755700717; c=relaxed/simple; bh=rayykEdii9uM7WLI5yVA1XJxx/BDevTRmrThQcnhAB8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tF0OY/R6R2Y9nniW6uuqWOQCPfA/Ld0NXIJLeawxHxOL4OuPRnf+dukh39k34LzWVuJyx7UYHTLZCN6kLZBdVy6K4Rx0xApzI51u/IvI8a2UXW+oWjlUm0YYwlHvZGoIpgqneGUPQ9xXLwEQ4EBGy+sSDdm093pqDdrEr97CNhI= 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=GOCPIFZw; arc=none smtp.client-ip=192.198.163.18 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="GOCPIFZw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755700715; x=1787236715; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=rayykEdii9uM7WLI5yVA1XJxx/BDevTRmrThQcnhAB8=; b=GOCPIFZwTs1hJcU0oZPXUcFPf3RHkHJgkszPkyloidw0tl1Fi9Ax3jCk TkSsnfJro75koPRO1VVywrHxxnyQjP5uf/GOguEGchEFRpjqQlmXFSNt5 DWXwFSMotH0vOTPqWk1Q0F7/Xif6v2zKpLtsDiebqvmDPYYNnOg+0WJ67 YIZOTJUAVwTbJ0ISlyOW15fsm8q7e02rM38NI5QdGcRO2CUFIsUUmRLFQ E+0Np6gLf2LZ6ADGZLI2mv2qMnoSn3fRz8fhtcAqBVRBHjfmyxbkDzEla 1E0nEV0Jm89aKD84hFfYmuer6yn62AjlPtZ67TkCfuREL0rAm0FRxk1k4 A==; X-CSE-ConnectionGUID: xrje3xjeTg+UyVSNY7p8UA== X-CSE-MsgGUID: EdU9HnGlQJakoO9tAVjqTQ== X-IronPort-AV: E=McAfee;i="6800,10657,11527"; a="57167754" X-IronPort-AV: E=Sophos;i="6.17,302,1747724400"; d="scan'208";a="57167754" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by fmvoesa112.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2025 07:38:30 -0700 X-CSE-ConnectionGUID: V1i/iTWDSem7g2AAUIN+Ig== X-CSE-MsgGUID: Sdc59zCpT5eykfS/4HXsSw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,302,1747724400"; d="scan'208";a="167368811" Received: from ettammin-desk.ger.corp.intel.com (HELO kekkonen.fi.intel.com) ([10.245.245.19]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2025 07:38:28 -0700 Received: from punajuuri.localdomain (unknown [192.168.240.130]) by kekkonen.fi.intel.com (Postfix) with ESMTP id D6BE7121FA8; Wed, 20 Aug 2025 17:38:24 +0300 (EEST) Received: from sailus by punajuuri.localdomain with local (Exim 4.98.2) (envelope-from ) id 1uojxI-00000002JYM-3Y5s; Wed, 20 Aug 2025 17:38:24 +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 , =?UTF-8?q?Micha=C5=82=20Pecio?= Subject: [PATCH v5 4/9] usb: core: Add a function to get USB version independent periodic payload Date: Wed, 20 Aug 2025 17:38:19 +0300 Message-ID: <20250820143824.551777-5-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250820143824.551777-1-sakari.ailus@linux.intel.com> References: <20250820143824.551777-1-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_periodic_payload() to obtain maximum payload bytes in a service interval for isochronous and interrupt 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 | 29 +++++++++++++++++++++++++++++ include/linux/usb.h | 3 +++ 2 files changed, 32 insertions(+) diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index fca7735fc660..ca9ff6ad8e73 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1110,6 +1110,35 @@ void usb_free_noncoherent(struct usb_device *dev, size_t size, } EXPORT_SYMBOL_GPL(usb_free_noncoherent); +/** + * usb_endpoint_max_periodic_payload - Get maximum payload bytes per service + * interval + * @udev: The USB device + * @ep: The endpoint + * + * Returns: the maximum number of bytes isochronous or interrupt endpoint @ep + * can transfer during a service interval, or 0 for other endpoints. + */ +u32 usb_endpoint_max_periodic_payload(struct usb_device *udev, + const struct usb_host_endpoint *ep) +{ + if (!usb_endpoint_xfer_isoc(&ep->desc) && + !usb_endpoint_xfer_int(&ep->desc)) + return 0; + + switch (udev->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); + default: + return usb_endpoint_maxp(&ep->desc) * usb_endpoint_maxp_mult(&ep->desc); + } +} +EXPORT_SYMBOL_GPL(usb_endpoint_max_periodic_payload); + /* * Notifications of device and interface registration */ diff --git a/include/linux/usb.h b/include/linux/usb.h index 9d662c6abb4d..e9cf2786d8bd 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -2039,6 +2039,9 @@ static inline u16 usb_maxpacket(struct usb_device *udev, int pipe) return usb_endpoint_maxp(&ep->desc); } +u32 usb_endpoint_max_periodic_payload(struct usb_device *udev, + const struct usb_host_endpoint *ep); + /* translate USB error codes to codes user space understands */ static inline int usb_translate_errors(int error_code) { -- 2.47.2