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    • Fabio Estevam's avatar
      clk: imx7d: do not set the parent of IMX7D_ENET_AXI_ROOT_SRC · 1fd92dba
      Fabio Estevam authored
      Booting the kernel on a imx7s-warp leads to several warnings like these:
      
      [    0.000000] ------------[ cut here ]------------
      [    0.000000] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:3536 lock_release+0x2f8/0x330
      [    0.000000] releasing a pinned lock
      
      [    0.000000] ------------[ cut here ]------------
      [    0.000000] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:2722 trace_hardirqs_on_caller+0x1ac/0x1f4
      [    0.000000] DEBUG_LOCKS_WARN_ON(unlikely(early_boot_irqs_disabled))
      
      [    0.000000] ---[ end trace cb88537fdc8fa201 ]---
      [    0.000000] bad: scheduling from the idle thread!
      [    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W       4.7.0-rc7-next-20160715 #404
      
      [    0.000000] ------------[ cut here ]------------
      [    0.000000] WARNING: CPU: 0 PID: 0 at kernel/time/sched_clock.c:179 sched_clock_register+0x44/0x1f8
      [    0.000000] Modules linked in:
      
      [    0.000591] ------------[ cut here ]------------
      [    0.000610] WARNING: CPU: 0 PID: 0 at kernel/time/sched_clock.c:179 sched_clock_register+0x44/0x1f8
      
      [    0.002084] ------------[ cut here ]------------
      [    0.002104] WARNING: CPU: 0 PID: 0 at init/main.c:576 start_kernel+0x258/0x3b0
      [    0.002114] Interrupts were enabled early
      
      This fix is along the same lines as 5e33ebff ("clk: imx7d: do not
      set parent of ethernet time/ref clocks") and the explanation from that
      commit is:
      
      "The reason for the warning is that setting the parent enables the ENET
       PLL since we are using CLK_OPS_PARENT_ENABLE. Enabling the ENET PLL can
       cause clk_pllv3_wait_lock to sleep. See also:
       commit fc8726a2 ("clk: core: support clocks which requires parents
       enable (part 2)")."
      
      imx7s-warp does not even use the FEC interface, so we should not really
      configure the parent of IMX7D_ENET_AXI_ROOT_SRC in the common MX7 clock
      driver code.
      
      The dts file should use the assigned-clocks/assigned-clock-parents method,
      so simply remove the configuration of IMX7D_ENET_AXI_ROOT_SRC parent.
      Signed-off-by: default avatarFabio Estevam <fabio.estevam@nxp.com>
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      1fd92dba