Re: meson-gx-mmc: 2nd patch set

[Helmut Klein <hgkr.klein@gmail.com>]

On 18.03.2017 11:24, Heiner Kallweit wrote:
> Am 18.03.2017 um 09:11 schrieb Helmut Klein:
>> On 17.03.2017 20:54, Heiner Kallweit wrote:
>>> Am 17.03.2017 um 19:00 schrieb Helmut Klein:
>>>> On 17.03.2017 07:44, Heiner Kallweit wrote:
>>>>> Am 16.03.2017 um 22:12 schrieb Helmut Klein:
>>>>>> Hallo Heiner,
>>>>>>
>>>>>> i applied your 2nd patch sets to linux-amlogic. (and of course the older set v5 1...10).
>>>>>>
>>>>>> The performance of the sd-card and the mmc-chip of my minimx is much better now.
>>>>>>
>>>>>> sd-card: from 6.5 to 22.5 MBytes/s
>>>>>> mmc: from 14.5 to 28.5 MBytes/s (hs200 compatible device)
>>>>>>
>>>>>> But:
>>>>>> the wifi-adapter is no longer operational. The problem starts with patch 3 and gets worse with patch 5.
>>>>>>
>>>>>> the adapter (ap6330) is attached to the sdio port of the the s905. (=mmc1)
>>>>>>
>>>>> Thanks for testing and sharing the feedback. Much appreciated.
>>>>> The board I test on supports block devices only.
>>>>>
>>>>> Could you please share few more details:
>>>>> - Drivers involved
>>>>> - All syslog messages related to the device / driver
>>>>>
>>>>> And please set the relevant mailing lists on cc when providing test feedback.
>>>>> Others might find your feedback helpful too.
>>>>>
>>>>> Thanks, Heiner
>>>>>
>>>>>> so i think it is important to test your patch set asap on an officially supported board with a wifi adapter).
>>>>>>
>>>>>> regards
>>>>>> Helmut
>>>>>>
>>>>>
>>>>>
>>>>
>>>> The driver for the wifi adapter is brcmfmac. It is compiled as a module and loaded via /etc/modules.
>>>> the driver depends on the modules brcmutil and cfg80211, which are auto loaded.
>>>>
>>>> my user space is debian unstable. The kernel is cross compiled on my x86-64 laptop with gcc 5.4.1
>>>>
>>>> i use my own kernel configuration without an initial ramdisk. mmc, usb & ext4 drivers are compiled into the kernel
>>>>
>>>> kernel & dtb are loaded by u-boot from mmcblk2p1 (sd-card)
>>>>
>>>> the drive for the kernel is sda2 (sd-card inside of a usb card reader).
>>>>
>>>>
>>>> here is the filtered (mmc|brcmfmac) syslog output when only patches 1 & 2 are applied
>>>>
>>>> [    1.685012] meson-gx-mmc d0074000.mmc: allocated mmc-pwrseq
>>>> [    1.873010] mmc0: new DDR MMC card at address 0001
>>>> [    1.873258] mmcblk0: mmc0:0001 NCard  14.5 GiB
>>>> [    1.876731] mmcblk0boot0: mmc0:0001 NCard  partition 1 4.00 MiB
>>>> [    1.882597] mmcblk0boot1: mmc0:0001 NCard  partition 2 4.00 MiB
>>>> [    2.004399] meson-gx-mmc d0070000.mmc: allocated mmc-pwrseq
>>>> [    2.048160] meson-gx-mmc d0072000.mmc: Got CD GPIO
>>>> [    2.066962] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
>>>> [    2.068985] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.074242] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.081275] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
>>>> [    2.124761] mmc2: Skipping voltage switch
>>>> [    2.153763] mmc1: new high speed SDIO card at address 0001
>>>> [    2.158567] mmc2: new high speed SDHC card at address 59b4
>>>> [    2.159219] mmcblk2: mmc2:59b4 USD00 29.5 GiB
>>>> [    2.164206]  mmcblk2: p1 p2
>>>> [    6.664118] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Jan  6 2014 15:11:29 version 5.90.195.89.13 FWID 01-72f124c5
>>>> [    6.736239] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
>>>> [    6.928045] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 184
>>>> [    6.930475] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 188
>>>> [    6.938524] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 192
>>>> [    6.946543] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 196
>>>> [    6.954566] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 200
>>>> [    6.954663] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
>>>> [    6.969995] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 204
>>>> [    6.978023] brcmfmac: brcmf_construct_chaninfo: Ignoring unexpected firmware channel 208
>>>>
>>>> this is the output after adding patch 3
>>>>
>>>> [    1.684982] meson-gx-mmc d0074000.mmc: allocated mmc-pwrseq
>>>> [    1.873041] mmc0: new DDR MMC card at address 0001
>>>> [    1.873273] mmcblk0: mmc0:0001 NCard  14.5 GiB
>>>> [    1.876765] mmcblk0boot0: mmc0:0001 NCard  partition 1 4.00 MiB
>>>> [    1.882621] mmcblk0boot1: mmc0:0001 NCard  partition 2 4.00 MiB
>>>> [    2.004408] meson-gx-mmc d0070000.mmc: allocated mmc-pwrseq
>>>> [    2.048189] meson-gx-mmc d0072000.mmc: Got CD GPIO
>>>> [    2.066978] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
>>>> [    2.069001] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.074253] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.081285] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
>>>> [    2.124874] mmc2: Skipping voltage switch
>>>> [    2.153475] mmc1: new high speed SDIO card at address 0001
>>>> [    2.158610] mmc2: new high speed SDHC card at address 59b4
>>>> [    2.158935] mmcblk2: mmc2:59b4 USD00 29.5 GiB
>>>> [    2.163910]  mmcblk2: p1 p2
>>>> [    6.586318] brcmfmac: brcmf_sdiod_ramrw: membytes transfer failed <<<=====
>>>> [    6.586810] brcmfmac: brcmf_sdio_download_code_file: error -84 on writing 239507 membytes at 0x00000000
>>>> [    6.596373] brcmfmac: brcmf_sdio_download_firmware: dongle image file download failed
>>>>
>>>> and this is the output after adding patches 4 & 5
>>>>
>>>> [    1.684941] meson-gx-mmc d0074000.mmc: allocated mmc-pwrseq
>>>> [    1.868910] mmc0: new DDR MMC card at address 0001
>>>> [    1.869159] mmcblk0: mmc0:0001 NCard  14.5 GiB
>>>> [    1.872639] mmcblk0boot0: mmc0:0001 NCard  partition 1 4.00 MiB
>>>> [    1.878497] mmcblk0boot1: mmc0:0001 NCard  partition 2 4.00 MiB
>>>> [    1.884356] mmcblk0rpmb: mmc0:0001 NCard  partition 3 128 KiB <<<=====
>>>> [    2.000339] meson-gx-mmc d0070000.mmc: allocated mmc-pwrseq
>>>> [    2.044090] meson-gx-mmc d0072000.mmc: Got CD GPIO
>>>> [    2.062850] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
>>>> [    2.064869] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.070129] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
>>>> [    2.077161] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
>>>> [    2.120693] mmc2: Skipping voltage switch
>>>> [    2.148795] mmc1: new high speed SDIO card at address 0001
>>>> [    2.154443] mmc2: new high speed SDHC card at address 59b4
>>>> [    2.154660] mmcblk2: mmc2:59b4 USD00 29.5 GiB
>>>> [    2.159402]  mmcblk2: p1 p2
>>>> [    6.550881] brcmfmac: brcmf_chip_recognition: SB chip is not supported     <<<=====
>>>> [    6.556606] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach failed!
>>>> [    6.563260] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach failed
>>>> [    6.569796] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed -19...
>>>>
>>>> regards
>>>> Helmut
>>>>
>>>
>>> Thanks a lot for the additional information. The first version of the patch
>>> set broke byte mode obviously (block mode is working fine).
>>>
>>> Before submitting a new version of the patch set:
>>> Could you please apply patches 1, 2, and 4 of the patch set plus the
>>> following one and re-test?
>>>
>>> Thanks, Heiner
>>>
>>> ---
>>>  drivers/mmc/host/meson-gx-mmc.c | 222 ++++++++++++++++++++++------------------
>>>  1 file changed, 124 insertions(+), 98 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
>>> index 6bfd3da9..ca685902 100644
>>> --- a/drivers/mmc/host/meson-gx-mmc.c
>>> +++ b/drivers/mmc/host/meson-gx-mmc.c
>>> @@ -121,6 +121,13 @@
>>>  #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */
>>>  #define MUX_CLK_NUM_PARENTS 2
>>>
>>> +struct sd_emmc_desc {
>>> +    u32 cmd_cfg;
>>> +    u32 cmd_arg;
>>> +    u32 cmd_data;
>>> +    u32 cmd_resp;
>>> +};
>>> +
>>>  struct meson_host {
>>>      struct    device        *dev;
>>>      struct    mmc_host    *mmc;
>>> @@ -136,19 +143,12 @@ struct meson_host {
>>>      struct clk_divider cfg_div;
>>>      struct clk *cfg_div_clk;
>>>
>>> -    unsigned int bounce_buf_size;
>>> -    void *bounce_buf;
>>> -    dma_addr_t bounce_dma_addr;
>>> +    struct sd_emmc_desc *descs;
>>> +    dma_addr_t descs_dma_addr;
>>>
>>>      bool vqmmc_enabled;
>>>  };
>>>
>>> -struct sd_emmc_desc {
>>> -    u32 cmd_cfg;
>>> -    u32 cmd_arg;
>>> -    u32 cmd_data;
>>> -    u32 cmd_resp;
>>> -};
>>>  #define CMD_CFG_LENGTH_SHIFT 0
>>>  #define CMD_CFG_LENGTH_MASK 0x1ff
>>>  #define CMD_CFG_BLOCK_MODE BIT(9)
>>> @@ -185,6 +185,36 @@ static struct mmc_command *meson_mmc_get_next_command(struct mmc_command *cmd)
>>>          return NULL;
>>>  }
>>>
>>> +static enum dma_data_direction meson_mmc_get_data_dir(struct mmc_data *data)
>>> +{
>>> +    return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
>>> +}
>>> +
>>> +static void meson_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq)
>>> +{
>>> +    struct mmc_data *data = mrq->data;
>>> +
>>> +    if (!data)
>>> +        return;
>>> +
>>> +    data->host_cookie = true;
>>> +
>>> +    data->sg_count = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
>>> +                    meson_mmc_get_data_dir(data));
>>> +    if (!data->sg_count)
>>> +        dev_err(mmc_dev(mmc), "dma_map_sg failed");
>>> +}
>>> +
>>> +static void meson_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
>>> +                   int err)
>>> +{
>>> +    struct mmc_data *data = mrq->data;
>>> +
>>> +    if (data && data->sg_count)
>>> +        dma_unmap_sg(mmc_dev(mmc), data->sg, data->sg_len,
>>> +                 meson_mmc_get_data_dir(data));
>>> +}
>>> +
>>>  static int meson_mmc_clk_set(struct meson_host *host, unsigned long clk_rate)
>>>  {
>>>      struct mmc_host *mmc = host->mmc;
>>> @@ -434,104 +464,102 @@ static void meson_mmc_request_done(struct mmc_host *mmc,
>>>  static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
>>>  {
>>>      struct meson_host *host = mmc_priv(mmc);
>>> -    struct sd_emmc_desc *desc, desc_tmp;
>>> -    u32 cfg;
>>> -    u8 blk_len, cmd_cfg_timeout;
>>> -    unsigned int xfer_bytes = 0;
>>> +    struct sd_emmc_desc *desc = host->descs;
>>> +    struct mmc_data *data = cmd->data;
>>> +    struct scatterlist *sg;
>>> +    u32 cfg, cmd_cfg = 0;
>>> +    u8 blk_len;
>>> +    int i;
>>>
>>> -    /* Setup descriptors */
>>>      dma_rmb();
>>> -    desc = &desc_tmp;
>>> -    memset(desc, 0, sizeof(struct sd_emmc_desc));
>>>
>>> -    desc->cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK)    <<
>>> -        CMD_CFG_CMD_INDEX_SHIFT;
>>> -    desc->cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
>>> -    desc->cmd_arg = cmd->arg;
>>> +    cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK) <<
>>> +           CMD_CFG_CMD_INDEX_SHIFT;
>>> +    cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
>>>
>>>      /* Response */
>>>      if (cmd->flags & MMC_RSP_PRESENT) {
>>> -        desc->cmd_cfg &= ~CMD_CFG_NO_RESP;
>>>          if (cmd->flags & MMC_RSP_136)
>>> -            desc->cmd_cfg |= CMD_CFG_RESP_128;
>>> -        desc->cmd_cfg |= CMD_CFG_RESP_NUM;
>>> -        desc->cmd_resp = 0;
>>> +            cmd_cfg |= CMD_CFG_RESP_128;
>>> +        cmd_cfg |= CMD_CFG_RESP_NUM;
>>>
>>>          if (!(cmd->flags & MMC_RSP_CRC))
>>> -            desc->cmd_cfg |= CMD_CFG_RESP_NOCRC;
>>> +            cmd_cfg |= CMD_CFG_RESP_NOCRC;
>>>
>>>          if (cmd->flags & MMC_RSP_BUSY)
>>> -            desc->cmd_cfg |= CMD_CFG_R1B;
>>> +            cmd_cfg |= CMD_CFG_R1B;
>>>      } else {
>>> -        desc->cmd_cfg |= CMD_CFG_NO_RESP;
>>> +        cmd_cfg |= CMD_CFG_NO_RESP;
>>>      }
>>>
>>> -    /* data? */
>>> -    if (cmd->data) {
>>> -        desc->cmd_cfg |= CMD_CFG_DATA_IO;
>>> -        if (cmd->data->blocks > 1) {
>>> -            desc->cmd_cfg |= CMD_CFG_BLOCK_MODE;
>>> -            desc->cmd_cfg |=
>>> -                (cmd->data->blocks & CMD_CFG_LENGTH_MASK) <<
>>> -                CMD_CFG_LENGTH_SHIFT;
>>> +    if (data) {
>>> +        cmd_cfg |= CMD_CFG_DATA_IO;
>>> +
>>> +        if (data->blocks > 1) {
>>> +            cmd_cfg |= CMD_CFG_BLOCK_MODE;
>>>
>>>              /* check if block-size matches, if not update */
>>>              cfg = readl(host->regs + SD_EMMC_CFG);
>>>              blk_len = cfg & (CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
>>>              blk_len >>= CFG_BLK_LEN_SHIFT;
>>> -            if (blk_len != ilog2(cmd->data->blksz)) {
>>> -                dev_dbg(host->dev, "%s: update blk_len %d -> %d\n",
>>> -                    __func__, blk_len,
>>> -                    ilog2(cmd->data->blksz));
>>> -                blk_len = ilog2(cmd->data->blksz);
>>> +            if (blk_len != ilog2(data->blksz)) {
>>> +                dev_dbg(host->dev,
>>> +                    "%s: update blk_len %d -> %d\n",
>>> +                    __func__, blk_len, ilog2(data->blksz));
>>> +                blk_len = ilog2(data->blksz);
>>>                  cfg &= ~(CFG_BLK_LEN_MASK << CFG_BLK_LEN_SHIFT);
>>>                  cfg |= blk_len << CFG_BLK_LEN_SHIFT;
>>>                  writel(cfg, host->regs + SD_EMMC_CFG);
>>>              }
>>> -        } else {
>>> -            desc->cmd_cfg &= ~CMD_CFG_BLOCK_MODE;
>>> -            desc->cmd_cfg |=
>>> -                (cmd->data->blksz & CMD_CFG_LENGTH_MASK) <<
>>> -                CMD_CFG_LENGTH_SHIFT;
>>>          }
>>>
>>> -        cmd->data->bytes_xfered = 0;
>>> -        xfer_bytes = cmd->data->blksz * cmd->data->blocks;
>>> -        if (cmd->data->flags & MMC_DATA_WRITE) {
>>> -            desc->cmd_cfg |= CMD_CFG_DATA_WR;
>>> -            WARN_ON(xfer_bytes > host->bounce_buf_size);
>>> -            sg_copy_to_buffer(cmd->data->sg, cmd->data->sg_len,
>>> -                      host->bounce_buf, xfer_bytes);
>>> -            cmd->data->bytes_xfered = xfer_bytes;
>>> -            dma_wmb();
>>> -        } else {
>>> -            desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
>>> -        }
>>> +        data->bytes_xfered = 0;
>>> +        if (data->flags & MMC_DATA_WRITE)
>>> +            cmd_cfg |= CMD_CFG_DATA_WR;
>>>
>>> -        desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
>>> +        cmd_cfg |= ilog2(SD_EMMC_CMD_TIMEOUT_DATA) <<
>>> +               CMD_CFG_TIMEOUT_SHIFT;
>>> +
>>> +        for_each_sg(data->sg, sg, data->sg_count, i) {
>>> +            unsigned int len = sg_dma_len(sg);
>>> +
>>> +            if (data->blocks > 1)
>>> +                len /= data->blksz;
>>> +
>>> +            desc[i].cmd_cfg = cmd_cfg;
>>> +            desc[i].cmd_cfg |= (len & CMD_CFG_LENGTH_MASK) <<
>>> +                       CMD_CFG_LENGTH_SHIFT;
>>> +            if (i > 0)
>>> +                desc[i].cmd_cfg |= CMD_CFG_NO_CMD;
>>> +            desc[i].cmd_arg = cmd->arg;
>>> +            desc[i].cmd_resp = 0;
>>> +            desc[i].cmd_data = sg_dma_address(sg);
>>> +        }
>>> +        desc[data->sg_count - 1].cmd_cfg |= CMD_CFG_END_OF_CHAIN;
>>>
>>> -        cmd_cfg_timeout = ilog2(SD_EMMC_CMD_TIMEOUT_DATA);
>>>      } else {
>>> -        desc->cmd_cfg &= ~CMD_CFG_DATA_IO;
>>> -        cmd_cfg_timeout = ilog2(SD_EMMC_CMD_TIMEOUT);
>>> +        cmd_cfg |= ilog2(SD_EMMC_CMD_TIMEOUT) << CMD_CFG_TIMEOUT_SHIFT;
>>> +        cmd_cfg |= CMD_CFG_END_OF_CHAIN;
>>> +        desc[0].cmd_cfg = cmd_cfg;
>>> +        desc[0].cmd_arg = cmd->arg;
>>> +        desc[0].cmd_resp = 0;
>>> +        desc[0].cmd_data = 0;
>>>      }
>>> -    desc->cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
>>> -        CMD_CFG_TIMEOUT_SHIFT;
>>>
>>>      host->cmd = cmd;
>>>
>>> -    /* Last descriptor */
>>> -    desc->cmd_cfg |= CMD_CFG_END_OF_CHAIN;
>>> -    writel(desc->cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
>>> -    writel(desc->cmd_data, host->regs + SD_EMMC_CMD_DAT);
>>> -    writel(desc->cmd_resp, host->regs + SD_EMMC_CMD_RSP);
>>>      wmb(); /* ensure descriptor is written before kicked */
>>> -    writel(desc->cmd_arg, host->regs + SD_EMMC_CMD_ARG);
>>> +    cfg = host->descs_dma_addr | START_DESC_BUSY;
>>> +    writel(cfg, host->regs + SD_EMMC_START);
>>>  }
>>>
>>>  static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>>>  {
>>>      struct meson_host *host = mmc_priv(mmc);
>>> +    bool needs_pre_post_req = mrq->data && !mrq->data->host_cookie;
>>> +
>>> +    if (needs_pre_post_req)
>>> +        meson_mmc_pre_req(mmc, mrq);
>>>
>>>      /* Stop execution */
>>>      writel(0, host->regs + SD_EMMC_START);
>>> @@ -540,6 +568,9 @@ static void meson_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
>>>          meson_mmc_start_cmd(mmc, mrq->sbc);
>>>      else
>>>          meson_mmc_start_cmd(mmc, mrq->cmd);
>>> +
>>> +    if (needs_pre_post_req)
>>> +        meson_mmc_post_req(mmc, mrq, 0);
>>>  }
>>>
>>>  static void meson_mmc_read_resp(struct mmc_host *mmc, struct mmc_command *cmd)
>>> @@ -560,6 +591,7 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
>>>  {
>>>      struct meson_host *host = dev_id;
>>>      struct mmc_command *cmd;
>>> +    struct mmc_data *data;
>>>      u32 irq_en, status, raw_status;
>>>      irqreturn_t ret = IRQ_HANDLED;
>>>
>>> @@ -571,6 +603,8 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
>>>      if (WARN_ON(!cmd))
>>>          return IRQ_NONE;
>>>
>>> +    data = cmd->data;
>>> +
>>>      spin_lock(&host->lock);
>>>      irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
>>>      raw_status = readl(host->regs + SD_EMMC_STATUS);
>>> @@ -608,12 +642,17 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
>>>          dev_dbg(host->dev, "Unhandled IRQ: Descriptor timeout\n");
>>>          cmd->error = -ETIMEDOUT;
>>>      }
>>> +
>>> +    if (data && !cmd->error)
>>> +        data->bytes_xfered = data->blksz * data->blocks;
>>> +
>>>      if (status & IRQ_SDIO)
>>>          dev_dbg(host->dev, "Unhandled IRQ: SDIO.\n");
>>>
>>> -    if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS))
>>> -        ret = IRQ_WAKE_THREAD;
>>> -    else  {
>>> +    if (status & (IRQ_END_OF_CHAIN | IRQ_RESP_STATUS)) {
>>> +        if (meson_mmc_get_next_command(cmd))
>>> +            ret = IRQ_WAKE_THREAD;
>>> +    } else  {
>>>          dev_warn(host->dev, "Unknown IRQ! status=0x%04x: MMC CMD%u arg=0x%08x flags=0x%08x stop=%d\n",
>>>               status, cmd->opcode, cmd->arg,
>>>               cmd->flags, cmd->mrq->stop ? 1 : 0);
>>> @@ -642,26 +681,12 @@ static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
>>>  {
>>>      struct meson_host *host = dev_id;
>>>      struct mmc_command *next_cmd, *cmd = host->cmd;
>>> -    struct mmc_data *data;
>>> -    unsigned int xfer_bytes;
>>>
>>>      if (WARN_ON(!cmd))
>>>          return IRQ_NONE;
>>>
>>> -    data = cmd->data;
>>> -    if (data && data->flags & MMC_DATA_READ) {
>>> -        xfer_bytes = data->blksz * data->blocks;
>>> -        WARN_ON(xfer_bytes > host->bounce_buf_size);
>>> -        sg_copy_from_buffer(data->sg, data->sg_len,
>>> -                    host->bounce_buf, xfer_bytes);
>>> -        data->bytes_xfered = xfer_bytes;
>>> -    }
>>> -
>>>      next_cmd = meson_mmc_get_next_command(cmd);
>>> -    if (next_cmd)
>>> -        meson_mmc_start_cmd(host->mmc, next_cmd);
>>> -    else
>>> -        meson_mmc_request_done(host->mmc, cmd->mrq);
>>> +    meson_mmc_start_cmd(host->mmc, next_cmd);
>>>
>>>      return IRQ_HANDLED;
>>>  }
>>> @@ -695,6 +720,8 @@ static const struct mmc_host_ops meson_mmc_ops = {
>>>      .request    = meson_mmc_request,
>>>      .set_ios    = meson_mmc_set_ios,
>>>      .get_cd         = meson_mmc_get_cd,
>>> +    .pre_req    = meson_mmc_pre_req,
>>> +    .post_req    = meson_mmc_post_req,
>>>  };
>>>
>>>  static int meson_mmc_probe(struct platform_device *pdev)
>>> @@ -774,15 +801,14 @@ static int meson_mmc_probe(struct platform_device *pdev)
>>>
>>>      mmc->caps |= MMC_CAP_CMD23;
>>>      mmc->max_blk_count = CMD_CFG_LENGTH_MASK;
>>> -    mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size;
>>> -
>>> -    /* data bounce buffer */
>>> -    host->bounce_buf_size = mmc->max_req_size;
>>> -    host->bounce_buf =
>>> -        dma_alloc_coherent(host->dev, host->bounce_buf_size,
>>> -                   &host->bounce_dma_addr, GFP_KERNEL);
>>> -    if (host->bounce_buf == NULL) {
>>> -        dev_err(host->dev, "Unable to map allocate DMA bounce buffer.\n");
>>> +    mmc->max_segs = PAGE_SIZE / sizeof(struct sd_emmc_desc);
>>> +    mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size;
>>> +    mmc->max_req_size = mmc->max_seg_size * mmc->max_segs;
>>> +
>>> +    host->descs = dma_alloc_coherent(host->dev, PAGE_SIZE,
>>> +                     &host->descs_dma_addr, GFP_KERNEL);
>>> +    if (!host->descs) {
>>> +        dev_err(host->dev, "Allocating descriptor DMA buffer failed\n");
>>>          ret = -ENOMEM;
>>>          goto err_div_clk;
>>>      }
>>> @@ -807,8 +833,8 @@ static int meson_mmc_remove(struct platform_device *pdev)
>>>      /* disable interrupts */
>>>      writel(0, host->regs + SD_EMMC_IRQ_EN);
>>>
>>> -    dma_free_coherent(host->dev, host->bounce_buf_size,
>>> -              host->bounce_buf, host->bounce_dma_addr);
>>> +    dma_free_coherent(host->dev, PAGE_SIZE, host->descs,
>>> +              host->descs_dma_addr);
>>>
>>>      clk_disable_unprepare(host->cfg_div_clk);
>>>      clk_disable_unprepare(host->core_clk);
>>>
>>
>> compared to the patches 1...5 there is absolutely no change to patches 1, 2, 4 and the above. Neither syslog nor performance.
>>
> Thanks for re-testing. I have a little bit of a hard time to understand why SD and eMMC mode
> are working but SDIO (at least with brcfmac) is not. Especially as I don't have HW to test SDIO mode on.
>
> After patches 1, 2, 4 the system is still working normally?
> And would it be possible for you to compile a DEBUG kernel and post the mmc/brcmfmac related output?
> In DEBUG mode mode brcmfmac driver logs all SDIO transfers.
>
> Last but not least, could you please post /proc/interrupts ? This would give an idea whether any SDIO
> or just specific ones fail.
>
> Thanks, Heiner
>
>> regards
>> Helmut
>>
>
>

i enabled the debug flags for mmc and brcmfmac in the kernel configuration.
For the test i also changed meson-gx-mmc from built-in to module.
This resulted in a different order of the mmc devices. The sdio/wifi is 
now mmc0 and not mmc1

Without your new patch the wifi adapter works normally.

The debug info was produced with following commad sequence
  dmesg -n 8
  dmesg -D
  logger "loading meson-gx-mmc...."
  modprobe meson-gx-mmc
  sleep 1
  logger "loading brcmfmac"
  modprobe brcmfmac
  logger "modules loaded"
  sleep 1
  cp /var/log/syslog ~/syslog
  cp /proc/interrupts ~/interrupts

and filtered with: egrep "brcmfmac|mmc0|meson-gx-mmc"

because of the length of the files i removed most lines of the loading 
of meson-gx-mmc

unhandled interrupts: independent of the number of applied patches i've 
always got 11 of them.
  Only the timings differed with the applied patches

the is the log for applied patches 1, 2, 4 & the new one
   [   47.371608] mmc0: starting CMD52 arg 0020d000 flags 00000195
   [   47.371616] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371621] mmc0: starting CMD52 arg 0020d200 flags 00000195
   [   47.371629] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371635] mmc0: starting CMD52 arg 0020d400 flags 00000195
   [   47.371642] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371648] mmc0: starting CMD52 arg 0020d600 flags 00000195
   [   47.371656] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371662] mmc0: starting CMD52 arg 0020d800 flags 00000195
   [   47.371670] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371679] mmc0: starting CMD52 arg 0020da00 flags 00000195
   [   47.371687] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   47.371694] mmc0: starting CMD52 arg 0020dc00 flags 00000195
   [   47.371702] mmc0: req done (CMD52): 0: 000010ff 00000000 00000000 
00000000
   [   47.371716] mmc0: new high speed SDIO card at address 0001
   [   47.372210] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.373142] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.374077] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.375021] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.375950] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.376859] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.377770] meson-gx-mmc d0074000.mmc: Unhandled IRQ: Response timeout
   [   47.496509] meson-gx-mmc d0074000.mmc: change clock rate 400000 -> 
52000000
   [   47.496541] meson-gx-mmc d0074000.mmc: divider requested rate 
52000000 != actual rate 50000000
   [   47.496602] meson-gx-mmc d0074000.mmc: meson_mmc_set_ios: 
SD_EMMC_CFG: 0x00004890 -> 0x00004892
   [   47.497276] meson-gx-mmc d0074000.mmc: meson_mmc_set_ios: 
SD_EMMC_CFG: 0x00004892 -> 0x00004896
   loading brcmfmac
   [   48.731368] brcmfmac: brcmfmac_module_init No platform data available.
   [   48.731451] mmc0: starting CMD52 arg 80022040 flags 00000195
   [   48.731471] mmc0: req done (CMD52): 0: 00001040 00000000 00000000 
00000000
   [   48.731489] mmc0: starting CMD52 arg 80022200 flags 00000195
   [   48.731499] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731507] brcmfmac: brcmf_ops_sdio_probe Enter
   [   48.731510] brcmfmac: brcmf_ops_sdio_probe Class=0
   [   48.731512] brcmfmac: brcmf_ops_sdio_probe sdio vendor ID: 0x02d0
   [   48.731515] brcmfmac: brcmf_ops_sdio_probe sdio device ID: 0x4330
   [   48.731517] brcmfmac: brcmf_ops_sdio_probe Function#: 1
   [   48.731538] mmc0: starting CMD52 arg 80042000 flags 00000195
   [   48.731548] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731555] mmc0: starting CMD52 arg 80042202 flags 00000195
   [   48.731564] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.731580] brcmfmac: brcmf_ops_sdio_probe Enter
   [   48.731582] brcmfmac: brcmf_ops_sdio_probe Class=0
   [   48.731584] brcmfmac: brcmf_ops_sdio_probe sdio vendor ID: 0x02d0
   [   48.731586] brcmfmac: brcmf_ops_sdio_probe sdio device ID: 0x4330
   [   48.731588] brcmfmac: brcmf_ops_sdio_probe Function#: 2
   [   48.731593] brcmfmac: brcmf_ops_sdio_probe F2 found, calling 
brcmf_sdiod_probe...
   [   48.731596] mmc0: starting CMD52 arg 80022040 flags 00000195
   [   48.731606] mmc0: req done (CMD52): 0: 00001040 00000000 00000000 
00000000
   [   48.731613] mmc0: starting CMD52 arg 80022200 flags 00000195
   [   48.731622] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731629] mmc0: starting CMD52 arg 80042000 flags 00000195
   [   48.731638] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731644] mmc0: starting CMD52 arg 80042202 flags 00000195
   [   48.731653] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.731661] SDIO: Enabling device mmc0:0001:1...
   [   48.731664] mmc0: starting CMD52 arg 00000400 flags 00000195
   [   48.731673] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731680] mmc0: starting CMD52 arg 80000402 flags 00000195
   [   48.731689] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.731697] mmc0: starting CMD52 arg 00000600 flags 00000195
   [   48.731706] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.731713] SDIO: Enabled device mmc0:0001:1
   [   48.731717] brcmfmac: brcmf_sdio_probe Enter
   [   48.731795] brcmfmac: brcmf_sdiod_regrl addr:0x18000000
   [   48.731800] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000a, nbytes=1
   [   48.731804] mmc0: starting CMD52 arg 92001400 flags 00000195
   [   48.731813] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731821] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000b, nbytes=1
   [   48.731824] mmc0: starting CMD52 arg 92001600 flags 00000195
   [   48.731833] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.731840] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000c, nbytes=1
   [   48.731843] mmc0: starting CMD52 arg 92001818 flags 00000195
   [   48.731851] mmc0: req done (CMD52): 0: 00001018 00000000 00000000 
00000000
   [   48.731858] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x08000, nbytes=4
   [   48.731863] mmc0: starting CMD53 arg 15000004 flags 000001b5
   [   48.731866] mmc0:     blksz 4 blocks 1 flags 00000200 tsac 1000 ms 
nsac 0
   [   48.731878] mmc0: req done (CMD53): 0: 00001000 00000000 00000000 
00000000
   [   48.731881] mmc0:     4 bytes transferred: 0
   [   48.731887] brcmfmac: brcmf_sdiod_regrl data:0x00000000 
             <<<<===== wrong!
   [   48.731890] brcmfmac: F1 signature read @0x18000000=0x   0
   [   48.731892] brcmfmac: brcmf_sdiod_regwb addr:0x0001000e, data:0x28
   [   48.731895] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000e, nbytes=1
   [   48.731898] mmc0: starting CMD52 arg 92001c28 flags 00000195
   [   48.731906] mmc0: req done (CMD52): 0: 00001028 00000000 00000000 
00000000
   [   48.731912] brcmfmac: brcmf_sdiod_regrb addr:0x0001000e
   [   48.731915] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x1000e, nbytes=1
   [   48.731918] mmc0: starting CMD52 arg 12001c00 flags 00000195
   [   48.731926] mmc0: req done (CMD52): 0: 00001068 00000000 00000000 
00000000
   [   48.731931] brcmfmac: brcmf_sdiod_regrb data:0x68
   [   48.731936] brcmfmac: brcmf_sdiod_regwb addr:0x0001000e, data:0x28
   [   48.731938] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000e, nbytes=1
   [   48.731941] mmc0: starting CMD52 arg 92001c28 flags 00000195
   [   48.731950] mmc0: req done (CMD52): 0: 00001028 00000000 00000000 
00000000
   [   48.731957] brcmfmac: brcmf_sdiod_regrb addr:0x0001000e
   [   48.731960] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x1000e, nbytes=1
   [   48.731962] mmc0: starting CMD52 arg 12001c00 flags 00000195
   [   48.731970] mmc0: req done (CMD52): 0: 00001068 00000000 00000000 
00000000
   [   48.731985] brcmfmac: brcmf_sdiod_regrb data:0x68
   [   48.731987] brcmfmac: brcmf_sdiod_regrb addr:0x0001000e
   [   48.731990] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x1000e, nbytes=1
   [   48.731993] mmc0: starting CMD52 arg 12001c00 flags 00000195
   [   48.732001] mmc0: req done (CMD52): 0: 00001068 00000000 00000000 
00000000
   [   48.732019] brcmfmac: brcmf_sdiod_regrb data:0x68
   [   48.732021] brcmfmac: brcmf_sdiod_regwb addr:0x0001000e, data:0x21
   [   48.732024] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000e, nbytes=1
   [   48.732027] mmc0: starting CMD52 arg 92001c21 flags 00000195
   [   48.732037] mmc0: req done (CMD52): 0: 00001021 00000000 00000000 
00000000
   [   48.732151] brcmfmac: brcmf_sdiod_regwb addr:0x0001000f, data:0x00
   [   48.732160] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000f, nbytes=1
   [   48.732167] mmc0: starting CMD52 arg 92001e00 flags 00000195
   [   48.732181] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.732193] brcmfmac: brcmf_sdiod_regrl addr:0x18000000
   [   48.732200] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x08000, nbytes=4
   [   48.732208] mmc0: starting CMD53 arg 15000004 flags 000001b5
   [   48.732214] mmc0:     blksz 4 blocks 1 flags 00000200 tsac 1000 ms 
nsac 0
   [   48.732228] mmc0: req done (CMD53): 0: 00001000 00000000 00000000 
00000000
   [   48.732235] mmc0:     4 bytes transferred: 0
   [   48.732246] brcmfmac: brcmf_sdiod_regrl data:0x00000000
   [   48.732254] brcmfmac: brcmf_chip_recognition found SB chip: BCM0, 
rev=0
   [   48.732260] brcmfmac: brcmf_chip_recognition: SB chip is not supported
   [   48.732266] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach 
failed!
   [   48.732273] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach failed
   [   48.732280] brcmfmac: brcmf_sdio_remove Enter
   [   48.732285] brcmfmac: brcmf_sdiod_intr_unregister Entering oob=0 sd=0
   [   48.732290] brcmfmac: brcmf_detach Enter
   [   48.733671] brcmfmac: brcmf_sdio_remove Disconnected
   [   48.733683] SDIO: Disabling device mmc0:0001:2...
   [   48.733689] mmc0: starting CMD52 arg 00000400 flags 00000195
   [   48.733709] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.733717] mmc0: starting CMD52 arg 80000402 flags 00000195
   [   48.733727] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.733732] SDIO: Disabled device mmc0:0001:2
   [   48.733736] SDIO: Disabling device mmc0:0001:1...
   [   48.733739] mmc0: starting CMD52 arg 00000400 flags 00000195
   [   48.733749] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   48.733760] mmc0: starting CMD52 arg 80000400 flags 00000195
   [   48.733768] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   48.733773] SDIO: Disabled device mmc0:0001:1
   [   48.733777] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed 
-19...

this is the debug data for applied patches 1,2 & 4 (left only few lines 
after the first CMD53)
   [   52.458082] mmc0: starting CMD52 arg 0020d000 flags 00000195
   [   52.458093] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458098] mmc0: starting CMD52 arg 0020d200 flags 00000195
   [   52.458108] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458116] mmc0: starting CMD52 arg 0020d400 flags 00000195
   [   52.458130] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458135] mmc0: starting CMD52 arg 0020d600 flags 00000195
   [   52.458147] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458152] mmc0: starting CMD52 arg 0020d800 flags 00000195
   [   52.458165] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458171] mmc0: starting CMD52 arg 0020da00 flags 00000195
   [   52.458187] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   52.458193] mmc0: starting CMD52 arg 0020dc00 flags 00000195
   [   52.458204] mmc0: req done (CMD52): 0: 000010ff 00000000 00000000 
00000000
   [   52.458217] mmc0: new high speed SDIO card at address 0001
   [   52.560803] meson-gx-mmc d0074000.mmc: change clock rate 400000 -> 
52000000
   [   52.560834] meson-gx-mmc d0074000.mmc: divider requested rate 
52000000 != actual rate 50000000
   [   52.560900] meson-gx-mmc d0074000.mmc: meson_mmc_set_ios: 
SD_EMMC_CFG: 0x00004890 -> 0x00004892
   [   52.561583] meson-gx-mmc d0074000.mmc: meson_mmc_set_ios: 
SD_EMMC_CFG: 0x00004892 -> 0x00004896
   loading brcmfmac
   [   53.796217] brcmfmac: brcmfmac_module_init No platform data available.
   [   53.796291] mmc0: starting CMD52 arg 80022040 flags 00000195
   [   53.796327] mmc0: req done (CMD52): 0: 00001040 00000000 00000000 
00000000
   [   53.796336] mmc0: starting CMD52 arg 80022200 flags 00000195
   [   53.796349] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796366] brcmfmac: brcmf_ops_sdio_probe Enter
   [   53.796368] brcmfmac: brcmf_ops_sdio_probe Class=0
   [   53.796370] brcmfmac: brcmf_ops_sdio_probe sdio vendor ID: 0x02d0
   [   53.796372] brcmfmac: brcmf_ops_sdio_probe sdio device ID: 0x4330
   [   53.796375] brcmfmac: brcmf_ops_sdio_probe Function#: 1
   [   53.796398] mmc0: starting CMD52 arg 80042000 flags 00000195
   [   53.796414] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796422] mmc0: starting CMD52 arg 80042202 flags 00000195
   [   53.796436] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   53.796444] brcmfmac: brcmf_ops_sdio_probe Enter
   [   53.796446] brcmfmac: brcmf_ops_sdio_probe Class=0
   [   53.796448] brcmfmac: brcmf_ops_sdio_probe sdio vendor ID: 0x02d0
   [   53.796450] brcmfmac: brcmf_ops_sdio_probe sdio device ID: 0x4330
   [   53.796452] brcmfmac: brcmf_ops_sdio_probe Function#: 2
   [   53.796458] brcmfmac: brcmf_ops_sdio_probe F2 found, calling 
brcmf_sdiod_probe...
   [   53.796461] mmc0: starting CMD52 arg 80022040 flags 00000195
   [   53.796478] mmc0: req done (CMD52): 0: 00001040 00000000 00000000 
00000000
   [   53.796489] mmc0: starting CMD52 arg 80022200 flags 00000195
   [   53.796502] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796509] mmc0: starting CMD52 arg 80042000 flags 00000195
   [   53.796521] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796527] mmc0: starting CMD52 arg 80042202 flags 00000195
   [   53.796541] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   53.796550] SDIO: Enabling device mmc0:0001:1...
   [   53.796552] mmc0: starting CMD52 arg 00000400 flags 00000195
   [   53.796564] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796570] mmc0: starting CMD52 arg 80000402 flags 00000195
   [   53.796583] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   53.796589] mmc0: starting CMD52 arg 00000600 flags 00000195
   [   53.796600] mmc0: req done (CMD52): 0: 00001002 00000000 00000000 
00000000
   [   53.796605] SDIO: Enabled device mmc0:0001:1
   [   53.796609] brcmfmac: brcmf_sdio_probe Enter
   [   53.796686] brcmfmac: brcmf_sdiod_regrl addr:0x18000000
   [   53.796691] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000a, nbytes=1
   [   53.796695] mmc0: starting CMD52 arg 92001400 flags 00000195
   [   53.796707] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796715] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000b, nbytes=1
   [   53.796718] mmc0: starting CMD52 arg 92001600 flags 00000195
   [   53.796729] mmc0: req done (CMD52): 0: 00001000 00000000 00000000 
00000000
   [   53.796743] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000c, nbytes=1
   [   53.796746] mmc0: starting CMD52 arg 92001818 flags 00000195
   [   53.796758] mmc0: req done (CMD52): 0: 00001018 00000000 00000000 
00000000
   [   53.796801] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x08000, nbytes=4
   [   53.796807] mmc0: starting CMD53 arg 15000004 flags 000001b5
   [   53.796810] mmc0:     blksz 4 blocks 1 flags 00000200 tsac 1000 ms 
nsac 0
   [   53.796826] mmc0: req done (CMD53): 0: 00001000 00000000 00000000 
00000000
   [   53.796829] mmc0:     4 bytes transferred: 0
   [   53.796836] brcmfmac: brcmf_sdiod_regrl data:0x16044330 
               <<<<<====== ok
   [   53.796839] brcmfmac: F1 signature read @0x18000000=0x16044330
   [   53.796841] brcmfmac: brcmf_sdiod_regwb addr:0x0001000e, data:0x28
   [   53.796844] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000e, nbytes=1
   [   53.796847] mmc0: starting CMD52 arg 92001c28 flags 00000195
   [   53.796858] mmc0: req done (CMD52): 0: 00001028 00000000 00000000 
00000000
   [   53.796872] brcmfmac: brcmf_sdiod_regrb addr:0x0001000e
   [   53.796875] brcmfmac: brcmf_sdiod_request_data rw=0, func=1, 
addr=0x1000e, nbytes=1
   [   53.796878] mmc0: starting CMD52 arg 12001c00 flags 00000195
   [   53.796890] mmc0: req done (CMD52): 0: 00001068 00000000 00000000 
00000000
   [   53.796897] brcmfmac: brcmf_sdiod_regrb data:0x68
   [   53.796902] brcmfmac: brcmf_sdiod_regwb addr:0x0001000e, data:0x28
   [   53.796905] brcmfmac: brcmf_sdiod_request_data rw=1, func=1, 
addr=0x1000e, nbytes=1

if you need more data: just ask ;-)

regards
Helmut