diff mbox series

[v2,2/2] clk: qcom: gcc-sm8550: Don't use shared clk_ops for QUPs

Message ID 20240827231237.1014813-3-swboyd@chromium.org
State Superseded
Headers show
Series clk: qcom: gcc-sm8550: Fix shared clk parking breakage | expand

Commit Message

Stephen Boyd Aug. 27, 2024, 11:12 p.m. UTC 
The QUPs aren't shared in a way that requires parking the RCG at an
always on parent in case some other entity turns on the clk. The
hardware is capable of setting a new frequency itself with the DFS mode,
so parking is unnecessary. Furthermore, there aren't any GDSCs for these
devices, so there isn't a possibility of the GDSC turning on the clks
for housekeeping purposes.

This wasn't a problem to mark these clks shared until we started parking
shared RCGs at clk registration time in commit 01a0a6cc8cfd ("clk: qcom:
Park shared RCGs upon registration"). Parking at init is actually
harmful to the UART when earlycon is used. If the device is pumping out
data while the frequency changes you'll see garbage on the serial
console until the driver can probe and actually set a proper frequency.

Revert the QUP part of commit 929c75d57566 ("clk: qcom: gcc-sm8550: Mark
RCGs shared where applicable") so that the QUPs don't get parked during
clk registration and break UART operations.

Fixes: 01a0a6cc8cfd ("clk: qcom: Park shared RCGs upon registration")
Fixes: 929c75d57566 ("clk: qcom: gcc-sm8550: Mark RCGs shared where applicable")
Cc: Konrad Dybcio <konradybcio@kernel.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Cc: Taniya Das <quic_tdas@quicinc.com>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Reported-by: Amit Pundir <amit.pundir@linaro.org>
Closes: https://lore.kernel.org/CAMi1Hd1KQBE4kKUdAn8E5FV+BiKzuv+8FoyWQrrTHPDoYTuhgA@mail.gmail.com
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/clk/qcom/gcc-sm8550.c | 52 +++++++++++++++++------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

Comments

Neil Armstrong Aug. 29, 2024, 8:39 a.m. UTC | #1 
On 28/08/2024 19:13, Stephen Boyd wrote:
> Quoting Neil Armstrong (2024-08-28 05:22:37)
>> On 28/08/2024 01:12, Stephen Boyd wrote:
>>> diff --git a/drivers/clk/qcom/gcc-sm8550.c b/drivers/clk/qcom/gcc-sm8550.c
>>> index 7944ddb4b47d..0244a05866b8 100644
>>> --- a/drivers/clk/qcom/gcc-sm8550.c
>>> +++ b/drivers/clk/qcom/gcc-sm8550.c
>>> @@ -992,7 +992,7 @@ static struct clk_init_data gcc_qupv3_wrap2_s7_clk_src_init = {
>>>        .parent_data = gcc_parent_data_0,
>>>        .num_parents = ARRAY_SIZE(gcc_parent_data_0),
>>>        .flags = CLK_SET_RATE_PARENT,
>>> -     .ops = &clk_rcg2_shared_ops,
>>> +     .ops = &clk_rcg2_ops,
>>>    };
>>>    
>>>    static struct clk_rcg2 gcc_qupv3_wrap2_s7_clk_src = {
>>
>> I think you missed gcc_qupv3_wrap2_s7_clk_src
> 
> Nope. The diff header shows it is in gcc_qupv3_wrap2_s7_clk_src_init
> which is assigned to the gcc_qupv3_wrap2_s7_clk_src clk's hw.init
> pointer.
> 
> 	.clkr.hw.init = &gcc_qupv3_wrap2_s7_clk_src_init,

Ack

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Even if I wasn't able to reproduce the original issue:
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
diff mbox series

Patch

diff --git a/drivers/clk/qcom/gcc-sm8550.c b/drivers/clk/qcom/gcc-sm8550.c
index 7944ddb4b47d..0244a05866b8 100644
--- a/drivers/clk/qcom/gcc-sm8550.c
+++ b/drivers/clk/qcom/gcc-sm8550.c
@@ -536,7 +536,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s0_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -551,7 +551,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s1_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -566,7 +566,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s2_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -581,7 +581,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s3_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -596,7 +596,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s4_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -611,7 +611,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s5_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -626,7 +626,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s6_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -641,7 +641,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s7_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -656,7 +656,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s8_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -671,7 +671,7 @@  static struct clk_rcg2 gcc_qupv3_i2c_s9_clk_src = {
 		.parent_data = gcc_parent_data_0,
 		.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 		.flags = CLK_SET_RATE_PARENT,
-		.ops = &clk_rcg2_shared_ops,
+		.ops = &clk_rcg2_ops,
 	},
 };
 
@@ -700,7 +700,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s0_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s0_clk_src = {
@@ -717,7 +717,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s1_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s1_clk_src = {
@@ -750,7 +750,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s2_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s2_clk_src = {
@@ -767,7 +767,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s3_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s3_clk_src = {
@@ -784,7 +784,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s4_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s4_clk_src = {
@@ -801,7 +801,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s5_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s5_clk_src = {
@@ -818,7 +818,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s6_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s6_clk_src = {
@@ -835,7 +835,7 @@  static struct clk_init_data gcc_qupv3_wrap1_s7_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap1_s7_clk_src = {
@@ -852,7 +852,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s0_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s0_clk_src = {
@@ -869,7 +869,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s1_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s1_clk_src = {
@@ -886,7 +886,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s2_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s2_clk_src = {
@@ -903,7 +903,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s3_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s3_clk_src = {
@@ -920,7 +920,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s4_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s4_clk_src = {
@@ -937,7 +937,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s5_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s5_clk_src = {
@@ -975,7 +975,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s6_clk_src_init = {
 	.parent_data = gcc_parent_data_8,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_8),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s6_clk_src = {
@@ -992,7 +992,7 @@  static struct clk_init_data gcc_qupv3_wrap2_s7_clk_src_init = {
 	.parent_data = gcc_parent_data_0,
 	.num_parents = ARRAY_SIZE(gcc_parent_data_0),
 	.flags = CLK_SET_RATE_PARENT,
-	.ops = &clk_rcg2_shared_ops,
+	.ops = &clk_rcg2_ops,
 };
 
 static struct clk_rcg2 gcc_qupv3_wrap2_s7_clk_src = {