Unverified Commit 52256736 authored by Maíra Canal's avatar Maíra Canal Committed by Stephen Boyd
Browse files

clk: bcm: rpi: Mark VEC clock as CLK_IGNORE_UNUSED 



On Raspberry Pi 3B, the VEC clock is used by the VideoCore firmware
display driver, which remains active until the vc4 driver loads and
sends NOTIFY_DISPLAY_DONE. If this clock is disabled during boot, a bus
lockup happens and the firmware becomes unresponsive, causing a complete
system lockup.

Mark the VEC clock with CLK_IGNORE_UNUSED so it survives the unused
clock disablement and remains available until the vc4 driver takes over
display management.

Fixes: 67229973 ("clk: bcm: rpi: Manage clock rate in prepare/unprepare callbacks")
Reported-by: default avatarMark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/r/5f0bec08-f458-4fba-8bf3-06817a100c4c@sirena.org.uk


Signed-off-by: default avatarMaíra Canal <mcanal@igalia.com>
Link: https://patch.msgid.link/20260401111416.562279-2-mcanal@igalia.com


Tested-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Acked-by: Brian Masney <bmasney@redhat.com> # Active contributor to clk
Reviewed-by: default avatarStefan Wahren <wahrenst@gmx.net>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent 6b701fde

drivers/clk/bcm/clk-raspberrypi.c

+7 −0
Original line number Diff line number Diff line
@@ -160,6 +160,13 @@ raspberrypi_clk_variants[RPI_FIRMWARE_NUM_CLK_ID] = { 
	[RPI_FIRMWARE_VEC_CLK_ID] = {

		.export = true,

		.minimize = true,



		/*

		 * If this clock is disabled during boot, it causes a bus

		 * lockup in RPi 3B. Therefore, make sure it's left enabled

		 * during boot.

		 */

		.flags = CLK_IGNORE_UNUSED,

	},

	[RPI_FIRMWARE_DISP_CLK_ID] = {

		.export = true,