[PATCH 1/3] mmc: sunxi-mmc: change idma descriptor to __le32
From: Michael Weiser <hidden>
Date: 2016-07-18 16:23:53
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
The sunxi-mmc driver does not take into account the processor may be big endian when writing the DMA descriptors. This causes cards not to be detected when running a big-endian kernel. Change the descriptors for IDMA to use __le32 and ensure they are suitably swapped before writing. Tested successfully on the Cubieboard2. Signed-off-by: Michael Weiser <redacted> --- drivers/mmc/host/sunxi-mmc.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 2ee4c21..8b8f08c 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c@@ -223,10 +223,10 @@ struct sunxi_mmc_clk_delay { }; struct sunxi_idma_des { - u32 config; - u32 buf_size; - u32 buf_addr_ptr1; - u32 buf_addr_ptr2; + __le32 config; + __le32 buf_size; + __le32 buf_addr_ptr1; + __le32 buf_addr_ptr2; }; struct sunxi_mmc_host {
@@ -325,22 +325,22 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host, int i, max_len = (1 << host->idma_des_size_bits); for (i = 0; i < data->sg_len; i++) { - pdes[i].config = SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN | - SDXC_IDMAC_DES0_DIC; + pdes[i].config = cpu_to_le32(SDXC_IDMAC_DES0_CH | SDXC_IDMAC_DES0_OWN | + SDXC_IDMAC_DES0_DIC); if (data->sg[i].length == max_len) pdes[i].buf_size = 0; /* 0 == max_len */ else - pdes[i].buf_size = data->sg[i].length; + pdes[i].buf_size = cpu_to_le32(data->sg[i].length); next_desc += sizeof(struct sunxi_idma_des); - pdes[i].buf_addr_ptr1 = sg_dma_address(&data->sg[i]); - pdes[i].buf_addr_ptr2 = (u32)next_desc; + pdes[i].buf_addr_ptr1 = cpu_to_le32(sg_dma_address(&data->sg[i])); + pdes[i].buf_addr_ptr2 = cpu_to_le32((u32)next_desc); } - pdes[0].config |= SDXC_IDMAC_DES0_FD; - pdes[i - 1].config |= SDXC_IDMAC_DES0_LD | SDXC_IDMAC_DES0_ER; - pdes[i - 1].config &= ~SDXC_IDMAC_DES0_DIC; + pdes[0].config |= cpu_to_le32(SDXC_IDMAC_DES0_FD); + pdes[i - 1].config |= cpu_to_le32(SDXC_IDMAC_DES0_LD | SDXC_IDMAC_DES0_ER); + pdes[i - 1].config &= cpu_to_le32(~SDXC_IDMAC_DES0_DIC); pdes[i - 1].buf_addr_ptr2 = 0; /*
--
2.9.0