clk: imx8m: fix clock tree update of TF-A managed clocks

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[ Upstream commit d36207b848 ]

On the i.MX8M*, the TF-A exposes a SiP (Silicon Provider) service
for DDR frequency scaling. The imx8m-ddrc-devfreq driver calls the
SiP and then does clk_set_parent on the DDR muxes to synchronize
the clock tree.

Since 936c383673 ("clk: imx: fix composite peripheral flags"),
these TF-A managed muxes have SET_PARENT_GATE set, which results
in imx8m-ddrc-devfreq's clk_set_parent after SiP failing with -EBUSY:

	echo 25000000 > userspace/set_freq
	imx8m-ddrc-devfreq 3d400000.memory-controller: failed to set
		dram_apb parent: -16

Fix this by adding a new i.MX composite flag for firmware managed
clocks, which clears SET_PARENT_GATE.

This is safe to do, because updating the Linux clock tree to reflect
reality will always be glitch-free.

Fixes: 936c383673 ("clk: imx: fix composite peripheral flags")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Link: https://lore.kernel.org/r/20210810151432.9228-1-a.fatoum@pengutronix.de
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Ahmad Fatoum 2021-08-10 17:14:33 +02:00 • committed by Greg Kroah-Hartman

parent e84a72f696

commit 926bf91248

5 changed files with 28 additions and 12 deletions

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3

drivers/clk/imx/clk-composite-8m.c

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7

drivers/clk/imx/clk-imx8mm.c

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7

drivers/clk/imx/clk-imx8mn.c

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7

drivers/clk/imx/clk-imx8mq.c

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16

drivers/clk/imx/clk.h

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