Messages in this thread Patch in this message | | | From | Christian Eggers <> | Subject | [PATCH 1/6] clk: imx6ul: disable gpmi_io clock before changing parent clock | Date | Tue, 25 Jan 2022 09:52:01 +0100 |
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gpmi_io clock may have been enabled by the boot loader. All children of enfc_clk_root must be gated in order to prevent glitches during parent change.
Signed-off-by: Christian Eggers <ceggers@arri.de> --- drivers/clk/imx/clk-imx6ul.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/clk/imx/clk-imx6ul.c b/drivers/clk/imx/clk-imx6ul.c index 520b100bff4b..f599ae50dd9f 100644 --- a/drivers/clk/imx/clk-imx6ul.c +++ b/drivers/clk/imx/clk-imx6ul.c @@ -514,6 +514,15 @@ static void __init imx6ul_clocks_init(struct device_node *ccm_node) else if (clk_on_imx6ull()) clk_set_parent(hws[IMX6ULL_CLK_EPDC_PRE_SEL]->clk, hws[IMX6UL_CLK_PLL3_PFD2]->clk); + /* + * gpmi_io clock may have been enabled by the boot loader. All children of + * enfc_clk_root must be gated in order to prevent glitches during parent + * change. The task of re-enabling is left to the gpmi-nand driver. + */ + if (clk_hw_is_enabled(hws[IMX6UL_CLK_GPMI_IO])) { + clk_prepare_enable(hws[IMX6UL_CLK_GPMI_IO]->clk); + clk_disable_unprepare(hws[IMX6UL_CLK_GPMI_IO]->clk); + } clk_set_parent(hws[IMX6UL_CLK_ENFC_SEL]->clk, hws[IMX6UL_CLK_PLL2_PFD2]->clk); } -- Christian Eggers Embedded software developer Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918 Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477 Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
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