clk: imx8m: Use SYS_PLL1_800M as intermediate parent of CLK_ARM

During cpu frequency switching the main "CLK_ARM" is reparented to an
intermediate "step" clock. On imx8mm and imx8mn the 24M oscillator is
used for this purpose but it is extremely slow, increasing wakeup
latencies to the point that i2c transactions can timeout and system
becomes unresponsive.

Fix by switching the "step" clk to SYS_PLL1_800M, matching the behavior
of imx8m cpufreq drivers in imx vendor tree.

This bug was not immediately apparent because upstream arm64 defconfig
uses the "performance" governor by default so no cpufreq transitions
happen.

Fixes: ba5625c3e272 ("clk: imx: Add clock driver support for imx8mm")
Fixes: 96d6392b54db ("clk: imx: Add support for i.MX8MN clock driver")
Cc: stable@vger.kernel.org
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Link: https://lkml.kernel.org/r/f5d2b9c53f1ed5ccb1dd3c6624f56759d92e1689.1571771777.git.leonard.crestez@nxp.com
Acked-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/imx/clk-imx8mm.c b/drivers/clk/imx/clk-imx8mm.c
index 067ab876911dd4979dae95746b0389f5bcd3caa8..172589e94f60e17658c4896b5127f0c94a170f95 100644 (file)
--- a/drivers/clk/imx/clk-imx8mm.c
+++ b/drivers/clk/imx/clk-imx8mm.c
@@ -638,7 +638,7 @@ static int imx8mm_clocks_probe(struct platform_device *pdev)
                                           clks[IMX8MM_CLK_A53_DIV],
                                           clks[IMX8MM_CLK_A53_SRC],
                                           clks[IMX8MM_ARM_PLL_OUT],
-                                          clks[IMX8MM_CLK_24M]);
+                                          clks[IMX8MM_SYS_PLL1_800M]);
 
        imx_check_clocks(clks, ARRAY_SIZE(clks));
 

diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
index 47a4b44ba3cb00319297e5afa2ec1490c50481be..58b5acee38306909e76e08587f6f310bceeab3ff 100644 (file)
--- a/drivers/clk/imx/clk-imx8mn.c
+++ b/drivers/clk/imx/clk-imx8mn.c
@@ -610,7 +610,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
                                           clks[IMX8MN_CLK_A53_DIV],
                                           clks[IMX8MN_CLK_A53_SRC],
                                           clks[IMX8MN_ARM_PLL_OUT],
-                                          clks[IMX8MN_CLK_24M]);
+                                          clks[IMX8MN_SYS_PLL1_800M]);
 
        imx_check_clocks(clks, ARRAY_SIZE(clks));