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| author | Han Xu <han.xu@nxp.com> | 2025-09-22 16:47:14 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-29 14:07:03 +0100 |
| commit | e42ec4eccebe2f2f63ef3d9ab70801b40132b3e9 (patch) | |
| tree | 7e0c9529f5df3c90a15da09ed641bbb5ee469247 | |
| parent | 18d1c06b72d565474f4a571534a100ad4bf49178 (diff) | |
| download | linux-e42ec4eccebe2f2f63ef3d9ab70801b40132b3e9.tar.gz linux-e42ec4eccebe2f2f63ef3d9ab70801b40132b3e9.tar.bz2 linux-e42ec4eccebe2f2f63ef3d9ab70801b40132b3e9.zip | |
spi: spi-nxp-fspi: add extra delay after dll locked
[ Upstream commit b93b4269791fdebbac2a9ad26f324dc2abb9e60f ]
Due to the erratum ERR050272, the DLL lock status register STS2
[xREFLOCK, xSLVLOCK] bit may indicate DLL is locked before DLL is
actually locked. Add an extra 4us delay as a workaround.
refer to ERR050272, on Page 20.
https://www.nxp.com/docs/en/errata/IMX8_1N94W.pdf
Fixes: 99d822b3adc4 ("spi: spi-nxp-fspi: use DLL calibration when clock rate > 100MHz")
Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://patch.msgid.link/20250922-fspi-fix-v1-2-ff4315359d31@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/spi/spi-nxp-fspi.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c index bc6c086ddd43..731504ec7ef8 100644 --- a/drivers/spi/spi-nxp-fspi.c +++ b/drivers/spi/spi-nxp-fspi.c @@ -665,6 +665,12 @@ static void nxp_fspi_dll_calibration(struct nxp_fspi *f) 0, POLL_TOUT, true); if (ret) dev_warn(f->dev, "DLL lock failed, please fix it!\n"); + + /* + * For ERR050272, DLL lock status bit is not accurate, + * wait for 4us more as a workaround. + */ + udelay(4); } /* |