diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/0021-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/0021-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/0021-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch b/target/linux/brcm2708/patches-4.9/0021-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch new file mode 100644 index 0000000000..94862f5bed --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/0021-clk-bcm2835-Mark-GPIO-clocks-enabled-at-boot-as-crit.patch @@ -0,0 +1,37 @@ +From c9cb54929b3466ed0da304563e22739477055d3b Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Mon, 9 May 2016 17:28:18 -0700 +Subject: [PATCH] clk: bcm2835: Mark GPIO clocks enabled at boot as critical. + +These divide off of PLLD_PER and are used for the ethernet and wifi +PHYs source PLLs. Neither of them is currently represented by a phy +device that would grab the clock for us. + +This keeps other drivers from killing the networking PHYs when they +disable their own clocks and trigger PLLD_PER's refcount going to 0. + +v2: Skip marking as critical if they aren't on at boot. + +Signed-off-by: Eric Anholt <eric@anholt.net> +--- + drivers/clk/bcm/clk-bcm2835.c | 9 +++++++++ + 1 file changed, 9 insertions(+) + +--- a/drivers/clk/bcm/clk-bcm2835.c ++++ b/drivers/clk/bcm/clk-bcm2835.c +@@ -1262,6 +1262,15 @@ static struct clk_hw *bcm2835_register_c + init.name = data->name; + init.flags = data->flags | CLK_IGNORE_UNUSED; + ++ /* ++ * Some GPIO clocks for ethernet/wifi PLLs are marked as ++ * critical (since some platforms use them), but if the ++ * firmware didn't have them turned on then they clearly ++ * aren't actually critical. ++ */ ++ if ((cprman_read(cprman, data->ctl_reg) & CM_ENABLE) == 0) ++ init.flags &= ~CLK_IS_CRITICAL; ++ + if (data->is_vpu_clock) { + init.ops = &bcm2835_vpu_clock_clk_ops; + } else { |