From patchwork Fri Nov 11 16:04:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 9423211 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EAEB660233 for ; Fri, 11 Nov 2016 16:04:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E6F6829A29 for ; Fri, 11 Nov 2016 16:04:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D82ED29B98; Fri, 11 Nov 2016 16:04:44 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 11EC729A29 for ; Fri, 11 Nov 2016 16:04:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755601AbcKKQEm (ORCPT ); Fri, 11 Nov 2016 11:04:42 -0500 Received: from ssl.serverraum.org ([213.133.101.245]:60402 "EHLO ssl.serverraum.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979AbcKKQEm (ORCPT ); Fri, 11 Nov 2016 11:04:42 -0500 Received: from mwalle01.sab.local. (unknown [194.25.174.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id EBF1422250; Fri, 11 Nov 2016 17:04:33 +0100 (CET) Authentication-Results: ssl.serverraum.org; dmarc=none header.from=walle.cc DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1478880274; bh=DlRBaHukOKRZolBJCU91rlrwylM+ND5CbZrGQUQA3ZY=; h=From:To:Cc:Subject:Date:From; b=I7mPt0JUTkGMFKwJUbvNjzbyJMvvOp955LlOSaeqU4/EAB9tTy4S2kg6WaRSK8UUV CiUXbwzXxh51WIJETLRuzChbuAWON14TPTisMOFqSytw2Hjiatr7ZjaX96A4Zz1GyM o+/0EsU9HrLoFpNoUlzfvxNsPugK70OZFZHcBkS8= From: Michael Walle To: linux-kernel@vger.kernel.org Cc: linux-mmc@vger.kernel.org, Ulf Hansson , Adrian Hunter , yangbo lu , Michael Walle Subject: [PATCH v2] mmc: sdhci-of-esdhc: fixup PRESENT_STATE read Date: Fri, 11 Nov 2016 17:04:19 +0100 Message-Id: <1478880259-24943-1-git-send-email-michael@walle.cc> X-Mailer: git-send-email 2.1.4 X-Virus-Scanned: clamav-milter 0.99.2 at web X-Virus-Status: Clean Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since commit 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy cards in __mmc_switch()") the ESDHC driver is broken: mmc0: Card stuck in programming state! __mmc_switch mmc0: error -110 whilst initialising MMC card Since this commit __mmc_switch() uses ->card_busy(), which is sdhci_card_busy() for the esdhc driver. sdhci_card_busy() uses the PRESENT_STATE register, specifically the DAT0 signal level bit. But the ESDHC uses a non-conformant PRESENT_STATE register, thus a read fixup is required to make the driver work again. Signed-off-by: Michael Walle Fixes: 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy cards in __mmc_switch()") --- v2: - use lower bits of the original value (that was actually a typo) - add fixes tag - fix typo drivers/mmc/host/sdhci-of-esdhc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index fb71c86..f9c84bb 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -66,6 +66,18 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host, return ret; } } + /* + * The DAT[3:0] line signal levels and the CMD line signal level is + * not compatible with standard SDHC register. Move the corresponding + * bits around. + */ + if (spec_reg == SDHCI_PRESENT_STATE) { + ret = value & ~0xf8000000; + ret |= (value >> 4) & SDHCI_DATA_LVL_MASK; + ret |= (value << 1) & 0x01000000; + return ret; + } + ret = value; return ret; }