Before reparenting the ENFC_SEL mux we have to make sure the GPMI_IO clk
is disabled as recommended in the reference manual. Otherwise glitches
may occur on the GPMI clk which result in a later NAND failure:
MXS: Timeout resetting block via register 0x01806000
mxs_nand 1806000.gpmi-n...@1806000.of: probe failed: Connection timed out
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
---
drivers/clk/imx/clk-imx6ul.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/clk/imx/clk-imx6ul.c b/drivers/clk/imx/clk-imx6ul.c
index b0a6bb0e8d..35483efde6 100644
--- a/drivers/clk/imx/clk-imx6ul.c
+++ b/drivers/clk/imx/clk-imx6ul.c
@@ -450,6 +450,9 @@ static int imx6_ccm_probe(struct device_d *dev)
clk_set_parent(clks[IMX6ULL_CLK_EPDC_PRE_SEL],
clks[IMX6UL_CLK_PLL3_PFD2]);
+ /* Disable GPMI_IO clk before reparenting to avoid glitches */
+ clks[IMX6UL_CLK_GPMI_IO]->ops->disable(clks[IMX6UL_CLK_GPMI_IO]);
+
clk_set_parent(clks[IMX6UL_CLK_ENFC_SEL], clks[IMX6UL_CLK_PLL2_PFD2]);
return 0;
--
2.24.0
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