From patchwork Thu Sep 12 04:13:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 11142155 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 72E8C18A6 for ; Thu, 12 Sep 2019 04:14:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5BBDA218DE for ; Thu, 12 Sep 2019 04:14:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726191AbfILEN7 (ORCPT ); Thu, 12 Sep 2019 00:13:59 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:37428 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725995AbfILEN7 (ORCPT ); Thu, 12 Sep 2019 00:13:59 -0400 X-IronPort-AV: E=Sophos;i="5.64,495,1559487600"; d="scan'208";a="26171979" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 12 Sep 2019 13:13:57 +0900 Received: from localhost.localdomain (unknown [10.166.17.210]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id EDA6F417A2E4; Thu, 12 Sep 2019 13:13:56 +0900 (JST) From: Yoshihiro Shimoda To: hch@lst.de, ulf.hansson@linaro.org, wsa+renesas@sang-engineering.com Cc: treding@nvidia.com, linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH v2 1/2] mmc: queue: Fix bigger segments usage Date: Thu, 12 Sep 2019 13:13:55 +0900 Message-Id: <1568261636-25625-2-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1568261636-25625-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1568261636-25625-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org The commit 38c38cb73223 ("mmc: queue: use bigger segments if DMA MAP layer can merge the segments") always enables the bugger segments if DMA MAP layer can merge the segments, but some controllers (SDHCI) have strictly limitation about the segments size, and then the commit breaks on the controllers. To fix the issue, this patch adds a new flag MMC_CAP2_MERGE_CAPABLE into the struct mmc_host and the bigger segments usage is disabled as default. Reported-by: Thierry Reding Fixes: 38c38cb73223 ("mmc: queue: use bigger segments if DMA MAP layer can merge the segments") Signed-off-by: Yoshihiro Shimoda Acked-by: Ulf Hansson Acked-by: Wolfram Sang --- drivers/mmc/core/queue.c | 8 +++++++- include/linux/mmc/host.h | 1 + 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c index 1e29b30..9edc086 100644 --- a/drivers/mmc/core/queue.c +++ b/drivers/mmc/core/queue.c @@ -399,6 +399,11 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card) init_waitqueue_head(&mq->wait); } +static inline bool mmc_merge_capable(struct mmc_host *host) +{ + return host->caps2 & MMC_CAP2_MERGE_CAPABLE; +} + /* Set queue depth to get a reasonable value for q->nr_requests */ #define MMC_QUEUE_DEPTH 64 @@ -441,7 +446,8 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card) * the host->can_dma_map_merge should be set before to get max_segs * from mmc_get_max_segments(). */ - if (host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS && + if (mmc_merge_capable(host) && + host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS && dma_get_merge_boundary(mmc_dev(host))) host->can_dma_map_merge = 1; else diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index c5662b3..3becb28 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -367,6 +367,7 @@ struct mmc_host { #define MMC_CAP2_CQE (1 << 23) /* Has eMMC command queue engine */ #define MMC_CAP2_CQE_DCMD (1 << 24) /* CQE can issue a direct command */ #define MMC_CAP2_AVOID_3_3V (1 << 25) /* Host must negotiate down from 3.3V */ +#define MMC_CAP2_MERGE_CAPABLE (1 << 26) /* Host can merge a segment over the segment size */ int fixed_drv_type; /* fixed driver type for non-removable media */