lkml.org 
[lkml]   [2022]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/6] clk: imx6sx: disable gpmi_io clock before changing parent clock
Date
gpmi_io clocks may have been enabled by the boot loader. All children of
qspi2_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-imx6sx.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx6sx.c b/drivers/clk/imx/clk-imx6sx.c
index fc1bd23d4583..cf1c1fad45f9 100644
--- a/drivers/clk/imx/clk-imx6sx.c
+++ b/drivers/clk/imx/clk-imx6sx.c
@@ -546,8 +546,19 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
clk_set_parent(hws[IMX6SX_CLK_GPU_AXI_SEL]->clk, hws[IMX6SX_CLK_PLL3_PFD0]->clk);

clk_set_parent(hws[IMX6SX_CLK_QSPI1_SEL]->clk, hws[IMX6SX_CLK_PLL2_BUS]->clk);
- clk_set_parent(hws[IMX6SX_CLK_QSPI2_SEL]->clk, hws[IMX6SX_CLK_PLL2_BUS]->clk);

imx_register_uart_clocks(2);
+
+ /*
+ * gpmi_io clock may have been enabled by the boot loader. All children
+ * of qspi2_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[IMX6SX_CLK_GPMI_IO])) {
+ clk_prepare_enable(hws[IMX6SX_CLK_GPMI_IO]->clk);
+ clk_disable_unprepare(hws[IMX6SX_CLK_GPMI_IO]->clk);
+ }
+ clk_set_parent(hws[IMX6SX_CLK_QSPI2_SEL]->clk, hws[IMX6SX_CLK_PLL2_BUS]->clk);
}
CLK_OF_DECLARE(imx6sx, "fsl,imx6sx-ccm", imx6sx_clocks_init);
--
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

\
 
 \ /
  Last update: 2022-01-25 10:00    [W:0.255 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site