mmc: meson-mx-sdhc: Set MANUAL_STOP for multi-block SDIO commands

The vendor driver implements special handling for multi-block
SD_IO_RW_EXTENDED (and SD_IO_RW_DIRECT) commands which have data
attached to them. It sets the MANUAL_STOP bit in the MESON_SDHC_MISC
register for these commands. In all other cases this bit is cleared.
Here we omit SD_IO_RW_DIRECT since that command never has any data
attached to it.

This fixes SDIO wifi using the brcmfmac driver which reported the
following error without this change on a Netxeon S82 board using a
Meson8 (S802) SoC:
  brcmf_fw_alloc_request: using brcm/brcmfmac43362-sdio for chip
                          BCM43362/1
  brcmf_sdiod_ramrw: membytes transfer failed
  brcmf_sdio_download_code_file: error -110 on writing 219557 membytes
                                 at 0x00000000
  brcmf_sdio_download_firmware: dongle image file download failed

And with this change:
  brcmf_fw_alloc_request: using brcm/brcmfmac43362-sdio for chip
                          BCM43362/1
  brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may
                            have limited channels available
  brcmf_c_preinit_dcmds: Firmware: BCM43362/1 wl0: Apr 22 2013 14:50:00
                         version 5.90.195.89.6 FWID 01-b30a427d

Fixes: 0b394db5070a6c ("mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211219153442.463863-2-martin.blumenstingl@googlemail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/meson-mx-sdhc-mmc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c
index 7cd9c0ec2fcfe97cd42c0458d9d6f32a67953545..8fdd0bbbfa21fb0ee77a769446f0769f04749ec4 100644 (file)
--- a/drivers/mmc/host/meson-mx-sdhc-mmc.c
+++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c
@@ -135,6 +135,7 @@ static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
                                    struct mmc_command *cmd)
 {
        struct meson_mx_sdhc_host *host = mmc_priv(mmc);
+       bool manual_stop = false;
        u32 ictl, send;
        int pack_len;
 
@@ -172,12 +173,27 @@ static void meson_mx_sdhc_start_cmd(struct mmc_host *mmc,
                else
                        /* software flush: */
                        ictl |= MESON_SDHC_ICTL_DATA_XFER_OK;
+
+               /*
+                * Mimic the logic from the vendor driver where (only)
+                * SD_IO_RW_EXTENDED commands with more than one block set the
+                * MESON_SDHC_MISC_MANUAL_STOP bit. This fixes the firmware
+                * download in the brcmfmac driver for a BCM43362/1 card.
+                * Without this sdio_memcpy_toio() (with a size of 219557
+                * bytes) times out if MESON_SDHC_MISC_MANUAL_STOP is not set.
+                */
+               manual_stop = cmd->data->blocks > 1 &&
+                             cmd->opcode == SD_IO_RW_EXTENDED;
        } else {
                pack_len = 0;
 
                ictl |= MESON_SDHC_ICTL_RESP_OK;
        }
 
+       regmap_update_bits(host->regmap, MESON_SDHC_MISC,
+                          MESON_SDHC_MISC_MANUAL_STOP,
+                          manual_stop ? MESON_SDHC_MISC_MANUAL_STOP : 0);
+
        if (cmd->opcode == MMC_STOP_TRANSMISSION)
                send |= MESON_SDHC_SEND_DATA_STOP;