linux-kernel - Re: [PATCH V3 1/2] mmc: mmci: add variant property to set command stop bit

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Date:   Thu, 3 Jan 2019 11:35:34 +0100
From:   Ludovic BARRE <ludovic.barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH V3 1/2] mmc: mmci: add variant property to set command
 stop bit

hi Ulf

happy new years.

Just a gentleman ping about patch2 of this series
"mmc: mmci: send stop command to clear the dpsm."

Regards
Ludo

On 12/11/18 10:53 AM, Ludovic BARRE wrote:
> 
> 
> On 12/11/18 10:47 AM, Ulf Hansson wrote:
>> On Thu, 6 Dec 2018 at 16:13, Ludovic Barre <ludovic.Barre@...com> wrote:
>>>
>>> From: Ludovic Barre <ludovic.barre@...com>
>>>
>>> On cmd12 (STOP_TRANSMISSION), STM32 sdmmc variant needs to set
>>> cmdstop bit in command register. The CPSM ("Command Path State Machine")
>>> treats the command as a Stop Transmission command and signals
>>> abort to the DPSM ("Data Path State Machine").
>>>
>>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>>
>> Applied for next, thanks!
> 
> thanks
> 
>>
>> Withholding patch2 for a while, as I need some more time to review it.
> 
> No problem,
> 
> Regards
> Ludo
> 
>>
>> Kind regards
>> Uffe
>>
>>> ---
>>>   drivers/mmc/host/mmci.c | 6 ++++++
>>>   drivers/mmc/host/mmci.h | 2 ++
>>>   2 files changed, 8 insertions(+)
>>>
>>> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
>>> index 13fa640..e352f5a 100644
>>> --- a/drivers/mmc/host/mmci.c
>>> +++ b/drivers/mmc/host/mmci.c
>>> @@ -21,6 +21,7 @@
>>>   #include <linux/err.h>
>>>   #include <linux/highmem.h>
>>>   #include <linux/log2.h>
>>> +#include <linux/mmc/mmc.h>
>>>   #include <linux/mmc/pm.h>
>>>   #include <linux/mmc/host.h>
>>>   #include <linux/mmc/card.h>
>>> @@ -274,6 +275,7 @@ static struct variant_data variant_stm32_sdmmc = {
>>>          .cmdreg_lrsp_crc        = MCI_CPSM_STM32_LRSP_CRC,
>>>          .cmdreg_srsp_crc        = MCI_CPSM_STM32_SRSP_CRC,
>>>          .cmdreg_srsp            = MCI_CPSM_STM32_SRSP,
>>> +       .cmdreg_stop            = MCI_CPSM_STM32_CMDSTOP,
>>>          .data_cmd_enable        = MCI_CPSM_STM32_CMDTRANS,
>>>          .irq_pio_mask           = MCI_IRQ_PIO_STM32_MASK,
>>>          .datactrl_first         = true,
>>> @@ -1100,6 +1102,10 @@ mmci_start_command(struct mmci_host *host, 
>>> struct mmc_command *cmd, u32 c)
>>>                  mmci_reg_delay(host);
>>>          }
>>>
>>> +       if (host->variant->cmdreg_stop &&
>>> +           cmd->opcode == MMC_STOP_TRANSMISSION)
>>> +               c |= host->variant->cmdreg_stop;
>>> +
>>>          c |= cmd->opcode | host->variant->cmdreg_cpsm_enable;
>>>          if (cmd->flags & MMC_RSP_PRESENT) {
>>>                  if (cmd->flags & MMC_RSP_136)
>>> diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
>>> index 550dd39..2422909 100644
>>> --- a/drivers/mmc/host/mmci.h
>>> +++ b/drivers/mmc/host/mmci.h
>>> @@ -264,6 +264,7 @@ struct mmci_host;
>>>    * @cmdreg_lrsp_crc: enable value for long response with crc
>>>    * @cmdreg_srsp_crc: enable value for short response with crc
>>>    * @cmdreg_srsp: enable value for short response without crc
>>> + * @cmdreg_stop: enable value for stop and abort transmission
>>>    * @datalength_bits: number of bits in the MMCIDATALENGTH register
>>>    * @fifosize: number of bytes that can be written when 
>>> MMCI_TXFIFOEMPTY
>>>    *           is asserted (likewise for RX)
>>> @@ -316,6 +317,7 @@ struct variant_data {
>>>          unsigned int            cmdreg_lrsp_crc;
>>>          unsigned int            cmdreg_srsp_crc;
>>>          unsigned int            cmdreg_srsp;
>>> +       unsigned int            cmdreg_stop;
>>>          unsigned int            datalength_bits;
>>>          unsigned int            fifosize;
>>>          unsigned int            fifohalfsize;
>>> -- 
>>> 2.7.4
>>>