From: Kishon Vijay Abraham I <kishon@ti.com>
To: Adrian Hunter <adrian.hunter@intel.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Tony Lindgren <tony@atomide.com>,
Rob Herring <robh+dt@kernel.org>
Cc: <nsekhar@ti.com>, <linux-omap@vger.kernel.org>,
<linux-mmc@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 1/7] mmc: sdhci: Add quirk to indicate no CRC stripping in MMC_RSP_136
Date: Thu, 17 Aug 2017 13:10:14 +0530 [thread overview]
Message-ID: <49848573-1c34-1322-26f5-144b9ec7f171@ti.com> (raw)
In-Reply-To: <f85729ab-09c2-1e88-626b-caca57cef702@intel.com>
On Thursday 17 August 2017 12:01 PM, Adrian Hunter wrote:
> On 17/08/17 08:20, Kishon Vijay Abraham I wrote:
>> Hi Adrian,
>>
>> On Tuesday 15 August 2017 12:57 PM, Adrian Hunter wrote:
>>> On 07/08/17 19:01, Kishon Vijay Abraham I wrote:
>>>> TI's implementation of sdhci controller used in DRA7 SoC's doesn't
>>>> strip CRC in responses with length 136 bits. Add quirk to indicate
>>>> the controller does not strip CRC in MMC_RSP_136. If this quirk is
>>>> set sdhci library shouldn't shift the response present in
>>>> SDHCI_RESPONSE register.
>>>>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>>>> ---
>>>> drivers/mmc/host/sdhci.c | 27 +++++++++++++++++++--------
>>>> drivers/mmc/host/sdhci.h | 2 ++
>>>> 2 files changed, 21 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>>> index ecd0d4350e8a..ece3751d2a25 100644
>>>> --- a/drivers/mmc/host/sdhci.c
>>>> +++ b/drivers/mmc/host/sdhci.c
>>>> @@ -1182,14 +1182,25 @@ static void sdhci_finish_command(struct sdhci_host *host)
>>>>
>>>> if (cmd->flags & MMC_RSP_PRESENT) {
>>>> if (cmd->flags & MMC_RSP_136) {
>>>> - /* CRC is stripped so we need to do some shifting. */
>>>> - for (i = 0;i < 4;i++) {
>>>> - cmd->resp[i] = sdhci_readl(host,
>>>> - SDHCI_RESPONSE + (3-i)*4) << 8;
>>>> - if (i != 3)
>>>> - cmd->resp[i] |=
>>>> - sdhci_readb(host,
>>>> - SDHCI_RESPONSE + (3-i)*4-1);
>>>> + if (!(host->quirks2 & SDHCI_QUIRK2_NO_CRC_STRIPPING)) {
>>>
>>> This is about the 136-bit response so let's put that in the quirk name. How about SDHCI_QUIRK2_RSP_136_HAS_CRC
>>
>> Since omap seems to be the only platform that doesn't have CRC, I prefer adding
>> SDHCI_QUIRK2_RSP_136_NO_CRC. That way we can add the quirk only in sdhci-omap
>> instead of all the existing sdhci drivers.
>
> Except that it is the way I described. All the others strip the CRC and we
> have to shift to pretend it is still there.
right. I made a totally bogus statement.
Thanks
Kishon
next prev parent reply other threads:[~2017-08-17 7:40 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 16:01 [RFC PATCH 0/7] mmc: Add OMAP SDHCI driver Kishon Vijay Abraham I
2017-08-07 16:01 ` [RFC PATCH 1/7] mmc: sdhci: Add quirk to indicate no CRC stripping in MMC_RSP_136 Kishon Vijay Abraham I
2017-08-15 7:27 ` Adrian Hunter
2017-08-17 5:20 ` Kishon Vijay Abraham I
2017-08-17 6:31 ` Adrian Hunter
2017-08-17 7:40 ` Kishon Vijay Abraham I [this message]
2017-08-07 16:01 ` [RFC PATCH 2/7] mmc: sdhci: Add quirk to indicate controller supports ADMA2 Kishon Vijay Abraham I
2017-08-15 7:33 ` Adrian Hunter
2017-08-17 5:30 ` Kishon Vijay Abraham I
2017-08-07 16:01 ` [RFC PATCH 3/7] mmc: sdhci: Add callback to set bus mode Kishon Vijay Abraham I
2017-08-15 7:38 ` Adrian Hunter
2017-08-17 5:31 ` Kishon Vijay Abraham I
2017-08-07 16:01 ` [RFC PATCH 4/7] mmc: sdhci: Add quirk to indicate broken POWER_CONTROL Kishon Vijay Abraham I
2017-08-15 7:41 ` Adrian Hunter
2017-08-17 5:32 ` Kishon Vijay Abraham I
2017-08-07 16:01 ` [RFC PATCH 5/7] dt-bindings: ti-omap-hsmmc: Document new compatible for sdhci omap Kishon Vijay Abraham I
2017-08-09 22:12 ` Tony Lindgren
2017-08-17 5:43 ` Kishon Vijay Abraham I
2017-08-17 16:05 ` Tony Lindgren
2017-08-07 16:01 ` [RFC PATCH 6/7] mmc: sdhci-omap: Add OMAP SDHCI driver Kishon Vijay Abraham I
2017-08-15 8:22 ` Adrian Hunter
2017-08-17 5:57 ` Kishon Vijay Abraham I
2017-08-17 6:43 ` Adrian Hunter
2017-08-17 7:59 ` Kishon Vijay Abraham I
2017-08-17 8:23 ` Adrian Hunter
2017-08-20 11:03 ` Kishon Vijay Abraham I
2017-08-07 16:01 ` [RFC PATCH 7/7] MAINTAINERS: Add TI OMAP SDHCI Maintainer Kishon Vijay Abraham I
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