[PATCH 0/2] clk: qcom: fix disp_cc_mdss_mdp_clk_src issues on sdm845

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

This is an alternative approach to the issue that Bjorn proposed in
https://lore.kernel.org/linux-arm-msm/20211203035436.3505743-1-bjorn.andersson@linaro.org/

The disp_cc_mdss_mdp_clk_src clock can become stuck during the boot
process for reasons other than just disabling the clocks in
clock_disable_unused phase. For example other drivers during the boot
procedure can toggle parent of the clock, disabling it for some reason.

So instead of enforcing clock parking during the clock_disable_unused,
park them during the driver probe. This can break the splash screen
display, however loosing the splash screen for few seconds is considered
to be lesser evil compared to possibly loosing the display at all
(because the RCG gets stuck).

----------------------------------------------------------------
Dmitry Baryshkov (2):
      clk: qcom: add API to safely park RCG2 sources
      clk: qcom: dispcc-sdm845: park disp_cc_mdss_mdp_clk_src

 drivers/clk/qcom/clk-rcg.h       |  2 ++
 drivers/clk/qcom/clk-rcg2.c      | 34 ++++++++++++++++++++++++++++++++++
 drivers/clk/qcom/dispcc-sdm845.c |  3 +++
 3 files changed, 39 insertions(+)