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| author | Icenowy Zheng | 2022-05-20 14:42:00 +0200 |
|---|---|---|
| committer | Peter Maydell | 2022-05-30 13:34:46 +0200 |
| commit | fd71f258bc0d245b2223bf3032c0ebc82f8a3463 (patch) | |
| tree | 5ee35636920c1571ac899a814986d2b446c1033e /hw/sd | |
| parent | target/arm/hvf: Include missing "cpregs.h" (diff) | |
| download | qemu-fd71f258bc0d245b2223bf3032c0ebc82f8a3463.tar.gz qemu-fd71f258bc0d245b2223bf3032c0ebc82f8a3463.tar.xz qemu-fd71f258bc0d245b2223bf3032c0ebc82f8a3463.zip | |
hw/sd/allwinner-sdhost: report FIFO water level as 1 when data ready
U-Boot queries the FIFO water level to reduce checking status register
when doing PIO SD card operation.
Report a FIFO water level of 1 when data is ready, to prevent the code
from trying to read 0 words from the FIFO each time.
Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Message-id: 20220520124200.2112699-1-uwu@icenowy.me
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/sd')
| -rw-r--r-- | hw/sd/allwinner-sdhost.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c index 041e45c680..455d6eabf6 100644 --- a/hw/sd/allwinner-sdhost.c +++ b/hw/sd/allwinner-sdhost.c @@ -114,7 +114,9 @@ enum { }; enum { + SD_STAR_FIFO_EMPTY = (1 << 2), SD_STAR_CARD_PRESENT = (1 << 8), + SD_STAR_FIFO_LEVEL_1 = (1 << 17), }; enum { @@ -467,6 +469,11 @@ static uint64_t allwinner_sdhost_read(void *opaque, hwaddr offset, break; case REG_SD_STAR: /* Status */ res = s->status; + if (sdbus_data_ready(&s->sdbus)) { + res |= SD_STAR_FIFO_LEVEL_1; + } else { + res |= SD_STAR_FIFO_EMPTY; + } break; case REG_SD_FWLR: /* FIFO Water Level */ res = s->fifo_wlevel; |