From: Takeshi Saito <takeshi.saito.xv@xxxxxxxxxxx>
In R-Car Gen2 or later, the maximum number of transfer blocks are
changed from 0xFFFF to 0xFFFFFFFF. Therefore, Block Count Register
should use iowrite32().
If another system (U-boot, Hypervisor OS, etc) uses bit[31:16], this
value will not be cleared. So, SD/MMC card initialization fails.
So, check for the bigger register and use apropriate write. Also, mark
the register as extended on Gen2.
Signed-off-by: Takeshi Saito <takeshi.saito.xv@xxxxxxxxxxx>
[wsa: use max_blk_count in if(), add Gen2, update commit message]
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
---
No Fixes tag because it is hard to point to a specific commit. So, just a
stable tag. I think as long as it applies, we are good to go.
Yamada-san, please check if your driver needs to set max_blk_count, too.
Tested on a Renesas Lager board (R-Car H2) and Salvator-XS (R-Car M3N).
Verified with debug prints that the correct code path was executed, no
regressions encountered when checksumming large files.
drivers/mmc/host/renesas_sdhi_sys_dmac.c | 1 +
drivers/mmc/host/tmio_mmc.h | 5 +++++
drivers/mmc/host/tmio_mmc_core.c | 5 ++++-
3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
index 8471160316e0..02cd878e209f 100644
--- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
@@ -65,6 +65,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
.scc_offset = 0x0300,
.taps = rcar_gen2_scc_taps,
.taps_num = ARRAY_SIZE(rcar_gen2_scc_taps),
+ .max_blk_count = 0xffffffff,
};
/* Definitions for sampling clocks */
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index c03529e3f01a..2adb0d24360f 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -277,6 +277,11 @@ static inline void sd_ctrl_write32_as_16_and_16(struct tmio_mmc_host *host,
iowrite16(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
}
+static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
+{
+ iowrite32(val, host->ctl + (addr << host->bus_shift));
+}
+
static inline void sd_ctrl_write32_rep(struct tmio_mmc_host *host, int addr,
const u32 *buf, int count)
{
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 085a0fab769c..198c811b478c 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -700,7 +700,10 @@ static int tmio_mmc_start_data(struct tmio_mmc_host *host,
/* Set transfer length / blocksize */
sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
- sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
+ if (host->mmc->max_blk_count >= SZ_64K)
+ sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks);
+ else
+ sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
tmio_mmc_start_dma(host, data);
--
2.11.0
