[PATCH] clk: i.MX6ul: Disable GPMI_IO clk before reparenting

[Sascha Hauer <s.hauer@pengutronix.de>]

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-nand@1806000.of: probe failed: Connection timed out

Signed-off-by: Sascha Hauer <s.hauer@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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