From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [PATCH v3] mmc: sdhci-of-esdhc: fixup PRESENT_STATE read Date: Tue, 15 Nov 2016 09:11:04 +0200 Message-ID: References: <1479136348-30706-1-git-send-email-michael@walle.cc> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from mga01.intel.com ([192.55.52.88]:9749 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932343AbcKOHQC (ORCPT ); Tue, 15 Nov 2016 02:16:02 -0500 In-Reply-To: <1479136348-30706-1-git-send-email-michael@walle.cc> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Michael Walle , linux-kernel@vger.kernel.org Cc: linux-mmc@vger.kernel.org, Ulf Hansson , yangbo lu On 14/11/16 17:12, Michael Walle wrote: > 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()") > --- > v3: > - explain the bits in the comments > - use bits[19:0] from the original value, all other will be taken from the > fixup value. > > 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 | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c > index fb71c86..74cf3b1 100644 > --- a/drivers/mmc/host/sdhci-of-esdhc.c > +++ b/drivers/mmc/host/sdhci-of-esdhc.c > @@ -66,6 +66,19 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host, > return ret; > } > } > + /* > + * The DAT[3:0] line signal levels and the CMD line signal level are > + * not compatible with standard SDHC register. The line signal levels > + * DAT[7:0] are at bits 31:24 and the line signal level is at bit 23. > + * All other bits are the same as in the standard SDHC register. > + */ > + if (spec_reg == SDHCI_PRESENT_STATE) { > + ret = value & 0x000fffff; > + ret |= (value >> 4) & SDHCI_DATA_LVL_MASK; > + ret |= (value << 1) & 0x01000000; Please define the command line level bit in sdhci.h and use that here. e.g. diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 766df17fb7eb..2570455b219a 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -73,6 +73,7 @@ #define SDHCI_DATA_LVL_MASK 0x00F00000 #define SDHCI_DATA_LVL_SHIFT 20 #define SDHCI_DATA_0_LVL_MASK 0x00100000 +#define SDHCI_CMD_LVL 0x01000000 #define SDHCI_HOST_CONTROL 0x28 #define SDHCI_CTRL_LED 0x01 > + return ret; > + } > + > ret = value; > return ret; > } >