[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PULL 003/117] hw/sd/allwinner-sdhost: report FIFO water level as 1 when
From: |
Peter Maydell |
Subject: |
[PULL 003/117] hw/sd/allwinner-sdhost: report FIFO water level as 1 when data ready |
Date: |
Mon, 30 May 2022 17:05:14 +0100 |
From: Icenowy Zheng <uwu@icenowy.me>
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>
---
hw/sd/allwinner-sdhost.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c
index 041e45c6804..455d6eabf64 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;
--
2.25.1
- [PULL 000/117] target-arm queue, Peter Maydell, 2022/05/30
- [PULL 003/117] hw/sd/allwinner-sdhost: report FIFO water level as 1 when data ready,
Peter Maydell <=
- [PULL 005/117] target/arm: Move null function and sve check into gen_gvec_ool_zz, Peter Maydell, 2022/05/30
- [PULL 011/117] target/arm: Move null function and sve check into gen_gvec_ool_zzzz, Peter Maydell, 2022/05/30
- [PULL 010/117] target/arm: Use TRANS_FEAT for do_sve2_zzz_ool, Peter Maydell, 2022/05/30
- [PULL 012/117] target/arm: Use TRANS_FEAT for gen_gvec_ool_zzzz, Peter Maydell, 2022/05/30
- [PULL 013/117] target/arm: Introduce gen_gvec_ool_arg_zzzz, Peter Maydell, 2022/05/30
- [PULL 001/117] docs/system/arm: Add FEAT_HCX to list of emulated features, Peter Maydell, 2022/05/30
- [PULL 007/117] target/arm: Move null function and sve check into gen_gvec_ool_zzz, Peter Maydell, 2022/05/30
- [PULL 015/117] target/arm: Use TRANS_FEAT for gen_gvec_ool_arg_zzzz, Peter Maydell, 2022/05/30
- [PULL 006/117] target/arm: Use TRANS_FEAT for gen_gvec_ool_zz, Peter Maydell, 2022/05/30
- [PULL 002/117] target/arm/hvf: Include missing "cpregs.h", Peter Maydell, 2022/05/30