diff options
Diffstat (limited to 'drivers/mmc/host/meson-gx-mmc.c')
| -rw-r--r-- | drivers/mmc/host/meson-gx-mmc.c | 37 |
1 files changed, 22 insertions, 15 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 13f6a2c0ed04..eb6c02bc4a02 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -227,7 +227,6 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc, struct mmc_data *data = mrq->data; struct scatterlist *sg; int i; - bool use_desc_chain_mode = true; /* * When Controller DMA cannot directly access DDR memory, disable @@ -237,25 +236,33 @@ static void meson_mmc_get_transfer_mode(struct mmc_host *mmc, if (host->dram_access_quirk) return; - /* - * Broken SDIO with AP6255-based WiFi on Khadas VIM Pro has been - * reported. For some strange reason this occurs in descriptor - * chain mode only. So let's fall back to bounce buffer mode - * for command SD_IO_RW_EXTENDED. - */ - if (mrq->cmd->opcode == SD_IO_RW_EXTENDED) - return; + if (data->blocks > 1) { + /* + * In block mode DMA descriptor format, "length" field indicates + * number of blocks and there is no way to pass DMA size that + * is not multiple of SDIO block size, making it impossible to + * tie more than one memory buffer with single SDIO block. + * Block mode sg buffer size should be aligned with SDIO block + * size, otherwise chain mode could not be used. + */ + for_each_sg(data->sg, sg, data->sg_len, i) { + if (sg->length % data->blksz) { + WARN_ONCE(1, "unaligned sg len %u blksize %u\n", + sg->length, data->blksz); + return; + } + } + } - for_each_sg(data->sg, sg, data->sg_len, i) + for_each_sg(data->sg, sg, data->sg_len, i) { /* check for 8 byte alignment */ - if (sg->offset & 7) { + if (sg->offset % 8) { WARN_ONCE(1, "unaligned scatterlist buffer\n"); - use_desc_chain_mode = false; - break; + return; } + } - if (use_desc_chain_mode) - data->host_cookie |= SD_EMMC_DESC_CHAIN_MODE; + data->host_cookie |= SD_EMMC_DESC_CHAIN_MODE; } static inline bool meson_mmc_desc_chain_mode(const struct mmc_data *data) |