From patchwork Thu Apr 11 16:42:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Noralf_Tr=C3=B8nnes?= X-Patchwork-Id: 10896415 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 66BFB1390 for ; Thu, 11 Apr 2019 16:43:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4FBD428D82 for ; Thu, 11 Apr 2019 16:43:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 442CA28D91; Thu, 11 Apr 2019 16:43:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A4A1928D98 for ; Thu, 11 Apr 2019 16:43:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 977CF89913; Thu, 11 Apr 2019 16:42:59 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtp.domeneshop.no (smtp.domeneshop.no [IPv6:2a01:5b40:0:3005::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id E3D9089907 for ; Thu, 11 Apr 2019 16:42:58 +0000 (UTC) Received: from 211.81-166-168.customer.lyse.net ([81.166.168.211]:49732 helo=localhost.localdomain) by smtp.domeneshop.no with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.84_2) (envelope-from ) id 1hEcmv-0007LK-1r; Thu, 11 Apr 2019 18:42:57 +0200 From: =?utf-8?q?Noralf_Tr=C3=B8nnes?= To: linux-spi@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH v4 0/4] Chunk splitting of spi transfers Date: Thu, 11 Apr 2019 18:42:31 +0200 Message-Id: <20190411164235.49771-1-noralf@tronnes.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tronnes.org; s=ds201810; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-Id:Date:Subject:Cc:To:From; bh=hc3WZaDFfKs7KlcXf8Ge7kT/wMd1DrOJkNM1erR4b7Q=; b=pyR0ibZyxGbzMKqlJjCx6HJll0dKBpLOBxHqeLtOYdD0GQON0Xw77RsmPfY/bITaXndCGaaPtRK1cLALb8E6H3Jsbc3lA2iTYpgzqX+S2b2IvwA87bgydPOYdR+ZmDe3B5v2wfsEygXT4lLvVR8RXmQUDBL8128J2bkB3Pp4f6Y2i5RRQV4sSZCUIOU6nKTrYaus2dbJk78xIzxW0Tm2VC+hDErOKiQiLnzxHQ1mf1AQeglK0f62vCnNTw+5ZDl7grwJCcsLZHPQZ+gAJmgaOlQhZqHBW8SAagQJiO8YzBEtxeuDJyp7OVzVVYoGlpjfk1+NbUdKRvFvaB3Mshe7/A==; X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stefan.wahren@i2se.com, broonie@kernel.org, linux-rpi-kernel@lists.infradead.org, meghana.madhyastha@gmail.com, kernel@martin.sperl.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP spi-bcm2835 has a ~64kB upper limit on DMA transfers. Drivers in drivers/gpu/drm/tinydrm work around this limitation by splitting the buffer into multiple transfers. This patchset lifts this limitation by splitting affected transfers in the SPI core using spi_split_transfers_maxsize(). This work[1] was begun by Meghana Madhyastha. Main changes in this version: - Remove warning in spi_split_transfers_maxsize() - Split SPI patch into core patch and driver patch Noralf. [1] https://patchwork.freedesktop.org/series/38913/ Meghana Madhyastha (3): spi: Split spi message into max_dma_len size chunks spi/spi-bcm2835: Remove DMA transfer size cap drm/tinydrm: Remove chunk splitting in tinydrm_spi_transfer Noralf Trønnes (1): spi: Remove warning in spi_split_transfers_maxsize() .../gpu/drm/tinydrm/core/tinydrm-helpers.c | 83 ++----------------- drivers/gpu/drm/tinydrm/mipi-dbi.c | 10 +-- drivers/spi/spi-bcm2835.c | 15 +--- drivers/spi/spi.c | 10 +-- 4 files changed, 13 insertions(+), 105 deletions(-)