[PATCH 0/2] clk: qcom: gcc-ipq5018: stop UBI0 clocks from reclocking their parents

[Andrei-Alexandru Bleortu]

ubi0_axi_clk_src and three UBI0 bus branches (gcc_ubi0_cfg_clk,
gcc_ubi0_utcm_clk, gcc_ubi0_nc_axi_clk) carry CLK_SET_RATE_PARENT, so a
rate request on them is propagated to GPLL0 or to the NoC clock sources
that the rest of the SoC runs from. The first patch is the one seen
failing: a 400 MHz request on ubi0_axi_clk_src made GPLL0 the top of the
rate change, re-ran set_rate on every GPLL0 consumer and hung the eMMC
controller. The second applies the same reasoning to the bus branches.

Nothing in mainline sets these rates today; the requests came from the
out-of-tree NSS driver on a Ubiquiti UniFi U6 Enterprise (IPQ5018).

Both were found and written with an AI coding assistant (Claude Code),
which also drafted the changelogs. The eMMC hang was seen while
bringing the board up on 6.12 with the NSS driver; the board boots and
runs with both on 6.12 and 7.2.8. On linux-next they are compile-tested
(W=1) only.

Andrei-Alexandru Bleortu (2):
  clk: qcom: gcc-ipq5018: drop CLK_SET_RATE_PARENT from ubi0_axi_clk_src
  clk: qcom: gcc-ipq5018: drop CLK_SET_RATE_PARENT from UBI0 NoC
    branches

 drivers/clk/qcom/gcc-ipq5018.c | 4 ----
 1 file changed, 4 deletions(-)

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2.47.3