| Message ID | 20220515210048.483898-10-robimarko@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v4,01/11] clk: qcom: ipq8074: fix NSS core PLL-s | expand |
Quoting Robert Marko (2022-05-15 14:00:47) > diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c > index 3204d550ff76..42d185fe19c8 100644 > --- a/drivers/clk/qcom/gcc-ipq8074.c > +++ b/drivers/clk/qcom/gcc-ipq8074.c > @@ -663,6 +663,7 @@ static struct clk_branch gcc_sleep_clk_src = { > }, > .num_parents = 1, > .ops = &clk_branch2_ops, > + .flags = CLK_IS_CRITICAL, > }, Why not just remove the clk from the driver? Is anything using it?
On Mon, 11 Jul 2022 at 23:10, Stephen Boyd <sboyd@kernel.org> wrote: > > Quoting Robert Marko (2022-05-15 14:00:47) > > diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c > > index 3204d550ff76..42d185fe19c8 100644 > > --- a/drivers/clk/qcom/gcc-ipq8074.c > > +++ b/drivers/clk/qcom/gcc-ipq8074.c > > @@ -663,6 +663,7 @@ static struct clk_branch gcc_sleep_clk_src = { > > }, > > .num_parents = 1, > > .ops = &clk_branch2_ops, > > + .flags = CLK_IS_CRITICAL, > > }, > > Why not just remove the clk from the driver? Is anything using it? Hi Stephen, USB sleep clocks are derived from it so it cant be dropped. Regards, Robert
Quoting Robert Marko (2022-07-11 14:14:38) > On Mon, 11 Jul 2022 at 23:10, Stephen Boyd <sboyd@kernel.org> wrote: > > > > Quoting Robert Marko (2022-05-15 14:00:47) > > > diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c > > > index 3204d550ff76..42d185fe19c8 100644 > > > --- a/drivers/clk/qcom/gcc-ipq8074.c > > > +++ b/drivers/clk/qcom/gcc-ipq8074.c > > > @@ -663,6 +663,7 @@ static struct clk_branch gcc_sleep_clk_src = { > > > }, > > > .num_parents = 1, > > > .ops = &clk_branch2_ops, > > > + .flags = CLK_IS_CRITICAL, > > > }, > > > > Why not just remove the clk from the driver? Is anything using it? > > Hi Stephen, USB sleep clocks are derived from it so it cant be dropped. > And we can't return NULL clks to USB for the sleep clk?
diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c index 3204d550ff76..42d185fe19c8 100644 --- a/drivers/clk/qcom/gcc-ipq8074.c +++ b/drivers/clk/qcom/gcc-ipq8074.c @@ -663,6 +663,7 @@ static struct clk_branch gcc_sleep_clk_src = { }, .num_parents = 1, .ops = &clk_branch2_ops, + .flags = CLK_IS_CRITICAL, }, }, };
Once the usb sleep clocks are disabled, clock framework is trying to disable the sleep clock source also. However, it seems that it cannot be disabled and trying to do so produces: [ 245.436390] ------------[ cut here ]------------ [ 245.441233] gcc_sleep_clk_src status stuck at 'on' [ 245.441254] WARNING: CPU: 2 PID: 223 at clk_branch_wait+0x130/0x140 [ 245.450435] Modules linked in: xhci_plat_hcd xhci_hcd dwc3 dwc3_qcom leds_gpio [ 245.456601] CPU: 2 PID: 223 Comm: sh Not tainted 5.18.0-rc4 #215 [ 245.463889] Hardware name: Xiaomi AX9000 (DT) [ 245.470050] pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 245.474307] pc : clk_branch_wait+0x130/0x140 [ 245.481073] lr : clk_branch_wait+0x130/0x140 [ 245.485588] sp : ffffffc009f2bad0 [ 245.489838] x29: ffffffc009f2bad0 x28: ffffff8003e6c800 x27: 0000000000000000 [ 245.493057] x26: 0000000000000000 x25: 0000000000000000 x24: ffffff800226ef20 [ 245.500175] x23: ffffffc0089ff550 x22: 0000000000000000 x21: ffffffc008476ad0 [ 245.507294] x20: 0000000000000000 x19: ffffffc00965ac70 x18: fffffffffffc51a7 [ 245.514413] x17: 68702e3030303837 x16: 3a6d726f6674616c x15: ffffffc089f2b777 [ 245.521531] x14: ffffffc0095c9d18 x13: 0000000000000129 x12: 0000000000000129 [ 245.528649] x11: 00000000ffffffea x10: ffffffc009621d18 x9 : 0000000000000001 [ 245.535767] x8 : 0000000000000001 x7 : 0000000000017fe8 x6 : 0000000000000001 [ 245.542885] x5 : ffffff803fdca6d8 x4 : 0000000000000000 x3 : 0000000000000027 [ 245.550002] x2 : 0000000000000027 x1 : 0000000000000023 x0 : 0000000000000026 [ 245.557122] Call trace: [ 245.564229] clk_branch_wait+0x130/0x140 [ 245.566490] clk_branch2_disable+0x2c/0x40 [ 245.570656] clk_core_disable+0x60/0xb0 [ 245.574561] clk_core_disable+0x68/0xb0 [ 245.578293] clk_disable+0x30/0x50 [ 245.582113] dwc3_qcom_remove+0x60/0xc0 [dwc3_qcom] [ 245.585588] platform_remove+0x28/0x60 [ 245.590361] device_remove+0x4c/0x80 [ 245.594179] device_release_driver_internal+0x1dc/0x230 [ 245.597914] device_driver_detach+0x18/0x30 [ 245.602861] unbind_store+0xec/0x110 [ 245.607027] drv_attr_store+0x24/0x40 [ 245.610847] sysfs_kf_write+0x44/0x60 [ 245.614405] kernfs_fop_write_iter+0x128/0x1c0 [ 245.618052] new_sync_write+0xc0/0x130 [ 245.622391] vfs_write+0x1d4/0x2a0 [ 245.626123] ksys_write+0x58/0xe0 [ 245.629508] __arm64_sys_write+0x1c/0x30 [ 245.632895] invoke_syscall.constprop.0+0x5c/0x110 [ 245.636890] do_el0_svc+0xa0/0x150 [ 245.641488] el0_svc+0x18/0x60 [ 245.644872] el0t_64_sync_handler+0xa4/0x130 [ 245.647914] el0t_64_sync+0x174/0x178 [ 245.652340] ---[ end trace 0000000000000000 ]--- So, add CLK_IS_CRITICAL flag to the clock so that the kernel won't try to disable the sleep clock. Signed-off-by: Robert Marko <robimarko@gmail.com> --- drivers/clk/qcom/gcc-ipq8074.c | 1 + 1 file changed, 1 insertion(+)