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| author | Cong Dang <cong.dang.xn@renesas.com> | 2023-02-07 18:30:51 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2023-02-09 14:06:11 +0100 |
| commit | 637581ce60403a27712c657453a210c8fd17cc66 (patch) | |
| tree | 0499bc3d08a1cf6b27a37a508eb0eeca9711537d /drivers/memory | |
| parent | 7d47f6ffa572fdd24d0c3364cead30f5ff7cc2da (diff) | |
| download | linux-stable-637581ce60403a27712c657453a210c8fd17cc66.tar.gz linux-stable-637581ce60403a27712c657453a210c8fd17cc66.tar.bz2 linux-stable-637581ce60403a27712c657453a210c8fd17cc66.zip | |
memory: renesas-rpc-if: Remove redundant division of dummy
The dummy cycles value was wrongly calculated if dummy.buswidth > 1,
which affects QSPI, OSPI, HyperFlash on various SoCs. We're lucky in
Single SPI case since its dummy.buswidth equals to 1, so the result of
the division is unchanged
This issue can be reproduced using something like the following commands
A. QSPI mode: Mount device with jffs2 format
jffs2: CLEANMARKER node found at 0x00000004, not first node in block (0x00000000)
B. QSPI mode: Write data to mtd10, where mtd10 is a parition on SPI Flash
storage, defined properly in a device tree
[Correct fragment, read from SPI Flash]
root@v3x:~# echo "hello" > /dev/mtd10
root@v3x:~# hexdump -C -n100 /dev/mtd10
00000000 68 65 6c 6c 6f 0a ff ff ff ff ff ff ff ff ff ff |hello...........|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
[Incorrect read of the same fragment: see the difference at offsets 0-3]
root@v3x:~# echo "hello" > /dev/mtd10
root@v3x:~# hexdump -C -n100 /dev/mtd10
00000000 00 00 00 00 68 65 6c 6c 6f 0a ff ff ff ff ff ff |....hello.......|
00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
As seen from the result, 4 NULL bytes were inserted before the test data.
Wrong calculation in rpcif_prepare() led to miss of some dummy cycle. A
division by bus width is redundant because it had been performed already
in spi-rpc-if.c::rpcif_spi_mem_prepare()
Fix this by removing the redundant division.
Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
Signed-off-by: Cong Dang <cong.dang.xn@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20230112090655.43367-1-wsa+renesas@sang-engineering.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230207173051.449151-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/renesas-rpc-if.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c index 62b06041d758..025bb628aaf3 100644 --- a/drivers/memory/renesas-rpc-if.c +++ b/drivers/memory/renesas-rpc-if.c @@ -435,8 +435,7 @@ void rpcif_prepare(struct device *dev, const struct rpcif_op *op, u64 *offs, if (op->dummy.buswidth) { rpc->enable |= RPCIF_SMENR_DME; - rpc->dummy = RPCIF_SMDMCR_DMCYC(op->dummy.ncycles / - op->dummy.buswidth); + rpc->dummy = RPCIF_SMDMCR_DMCYC(op->dummy.ncycles); } if (op->option.buswidth) { |