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

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Message-ID: <35f22c1a-888d-5abd-7ffe-ecf47a74b69a@st.com>
Date:   Tue, 11 Dec 2018 10:53:04 +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



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
>>