6.12-stable review patch. If anyone has any objections, please let me know.
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From: Han Xu han.xu@nxp.com
[ 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 --- drivers/spi/spi-nxp-fspi.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c index 5a1e55a01c521..b569302f22e61 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); }
/*