From: Han Xu Date: Mon, 22 Sep 2025 08:47:14 +0000 (+0800) Subject: spi: spi-nxp-fspi: add extra delay after dll locked X-Git-Tag: v6.18-rc3~26^2~8^2~1 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b93b4269791fdebbac2a9ad26f324dc2abb9e60f;p=thirdparty%2Fkernel%2Flinux.git spi: spi-nxp-fspi: add extra delay after dll locked 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 Signed-off-by: Haibo Chen Link: https://patch.msgid.link/20250922-fspi-fix-v1-2-ff4315359d31@nxp.com Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c index 4e82f9e900ac..96b3654b45ab 100644 --- a/drivers/spi/spi-nxp-fspi.c +++ b/drivers/spi/spi-nxp-fspi.c @@ -721,6 +721,12 @@ 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); } /*