diff options
| author | Maíra Canal <mcanal@igalia.com> | 2026-04-24 18:34:52 +0300 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2026-04-25 20:51:23 +0300 |
| commit | 522567362b634015ca85b5460482ee0843feb105 (patch) | |
| tree | 6b85f36328e4c3b3a196c2077184e6f273b76ad7 /drivers | |
| parent | 6b701fde9b31f085f39fc2a371cb33212fab6f68 (diff) | |
| download | linux-522567362b634015ca85b5460482ee0843feb105.tar.xz | |
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: 672299736af6 ("clk: bcm: rpi: Manage clock rate in prepare/unprepare callbacks")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/r/5f0bec08-f458-4fba-8bf3-06817a100c4c@sirena.org.uk
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patch.msgid.link/20260401111416.562279-2-mcanal@igalia.com
Tested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Brian Masney <bmasney@redhat.com> # Active contributor to clk
Reviewed-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clk/bcm/clk-raspberrypi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c index df2d246eb6ef..f1a99de6de4f 100644 --- a/drivers/clk/bcm/clk-raspberrypi.c +++ b/drivers/clk/bcm/clk-raspberrypi.c @@ -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, |