[PATCH 0/2] drm/vc4: hdmi: Fixes for the RaspberryPi 0-3 stalls

[Maxime Ripard]

Hi,

Here's a series addressing the current bug that has been reported for the
RaspberryPi3, where booting without an HDMI monitor attached and with vc4
compiled as a module will lead to a stuck system when the module is loaded.

This is due to the HSM clock not being initialized by anyone, and thus not
being functional once we start accessing the HDMI registers.

The first patch will fix this, and the second will make sure we avoid that
situation entirely in the future. This has been tested with 5.19.12. Earlier
versions might need a backport of 88110a9f6209 ("clk: bcm2835: fix
bcm2835_clock_choose_div").

Let me know what you think,
Maxime

To: Daniel Vetter <daniel at ffwll.ch>
To: David Airlie <airlied at linux.ie>
To: Emma Anholt <emma at anholt.net>
To: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
To: Maxime Ripard <mripard at kernel.org>
To: Thomas Zimmermann <tzimmermann at suse.de>
Cc: dri-devel at lists.freedesktop.org
Cc: linux-kernel at vger.kernel.org
Cc: Marc Kleine-Budde <mkl at pengutronix.de>
Cc: Stefan Wahren <stefan.wahren at i2se.com>
Link: https://lore.kernel.org/dri-devel/20220922145448.w3xfywkn5ecak2et@pengutronix.de/
Signed-off-by: Maxime Ripard <maxime at cerno.tech>

---
Maxime Ripard (2):
      drm/vc4: hdmi: Enforce the minimum rate at runtime_resume
      drm/vc4: hdmi: Check the HSM rate at runtime_resume

 drivers/gpu/drm/vc4/vc4_hdmi.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
---
base-commit: 58df6af8cea3c5377c0220d9fb47cbf85a216f54
change-id: 20220929-rpi-pi3-unplugged-fixes-5d61ea2cc383

Best regards,
-- 
Maxime Ripard <maxime at cerno.tech>