From patchwork Tue Oct 13 12:43:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tejas Joglekar X-Patchwork-Id: 11835831 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B71FEA6DC for ; Tue, 13 Oct 2020 18:11:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 78FC122482 for ; Tue, 13 Oct 2020 12:43:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=synopsys.com header.i=@synopsys.com header.b="EZsJpm4t" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727785AbgJMMnM (ORCPT ); Tue, 13 Oct 2020 08:43:12 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:46124 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727077AbgJMMnM (ORCPT ); Tue, 13 Oct 2020 08:43:12 -0400 Received: from mailhost.synopsys.com (mdc-mailhost2.synopsys.com [10.225.0.210]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id 3DB6BC0347; Tue, 13 Oct 2020 12:43:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1602592991; bh=wL1BJU6m2jy9lSYYmpV2etMteTnIvZvDitl4TiHkmo8=; h=Date:From:Subject:To:Cc:From; b=EZsJpm4t6J87RK9MgvbnJHr6rCahCrHxksoOYj8q739niaiOBIOlPI4GDEmoI70c4 qYLkDD6YITMF16IMa/RNgTTanq+LgKH7SdXrmFVqPYosk3Ou0QAbE5uk94EVfUOUy7 wNxzYy72bbLzKAuu2ltbqLiqPdXRDIE8CoXYLLNCv9emn9kuW/C9yKl64dTz2y9/1E RgMKWA+C9v4Ulj+k/zN5aU5thF0sZ0NzCUgWJHUPG7UYdFBtz3yQdm832dYMoAOb8b /RwLCPdqKekxRRz3xTM1cchJSHs1j8TLRrfRfCnXV1jRj7tHfjeA3NiNPH+O6Rn1AX fyQ3z8qVsuYJw== Received: from tejas-VirtualBox (joglekar-e7480.internal.synopsys.com [10.146.18.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailhost.synopsys.com (Postfix) with ESMTPSA id 6906CA005E; Tue, 13 Oct 2020 12:43:07 +0000 (UTC) Received: by tejas-VirtualBox (sSMTP sendmail emulation); Tue, 13 Oct 2020 18:13:05 +0530 Date: Tue, 13 Oct 2020 18:13:05 +0530 Message-Id: X-SNPS-Relay: synopsys.com From: Tejas Joglekar Subject: [PATCH v4 0/3] Add logic to consolidate TRBs for Synopsys xHC To: Felipe Balbi , Greg Kroah-Hartman , Tejas Joglekar , linux-usb@vger.kernel.org, Mathias Nyman Cc: John Youn Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The Synopsys xHC has an internal TRB cache of size TRB_CACHE_SIZE for each endpoint. The default value for TRB_CACHE_SIZE is 16 for SS and 8 for HS. The controller loads and updates the TRB cache from the transfer ring in system memory whenever the driver issues a start transfer or update transfer command. For chained TRBs, the Synopsys xHC requires that the total amount of bytes for all TRBs loaded in the TRB cache be greater than or equal to 1 MPS. Or the chain ends within the TRB cache (with a last TRB). If this requirement is not met, the controller will not be able to send or receive a packet and it will hang causing a driver timeout and error. This patch set adds logic to the XHCI driver to detect and prevent this from happening along with the quirk to enable this logic for Synopsys HAPS platform. Based on Mathias's feedback on previous implementation where consolidation was done in TRB cache, with this patch series the implementation is done during mapping of the URB by consolidating the SG list into a temporary buffer if the SG list buffer sizes within TRB_CACHE_SIZE is less than MPS. Changes since v3: - Removed the dt-binding patch - Added new patch to pass the quirk as platform data - Modified the patch to set the quirk Changes since v2: - Modified the xhci_unmap_temp_buffer function to unmap dma and c the dma flag - Removed RFC tag Changes since v1: - Comments from Greg are addressed on [PATCH 4/4] and [PATCH 1/4] - Renamed the property and quirk as in other patches based on [PATCH 1/4] Tejas Joglekar (3): usb: xhci: Set quirk for XHCI_SG_TRB_CACHE_SIZE_QUIRK usb: xhci: Use temporary buffer to consolidate SG usb: dwc3: Pass quirk as platform data drivers/usb/dwc3/host.c | 14 ++++ drivers/usb/host/xhci-plat.c | 3 + drivers/usb/host/xhci-ring.c | 2 +- drivers/usb/host/xhci.c | 137 ++++++++++++++++++++++++++++++++++- drivers/usb/host/xhci.h | 5 ++ 5 files changed, 159 insertions(+), 2 deletions(-)