diff mbox series

[v2,3/6] clk: qcom: branch: Add BRANCH_HALT_INVERT flag support for branch clocks

Message ID 20221014221011.7360-4-quic_molvera@quicinc.com (mailing list archive)
State Changes Requested, archived
Headers show
Series clk: qcom: Add clocks for the QDU1000 and QRU1000 SoCs | expand

Commit Message

Melody Olvera Oct. 14, 2022, 10:10 p.m. UTC 
From: Imran Shaik <quic_imrashai@quicinc.com>

Add the BRANCH_HALT_INVERT flag to handle the inverted status bit check
for branch clocks. Invert branch halt would indicate the clock ON when
CLK_OFF bit is '1' and OFF when CLK_OFF bit is '0'.

Signed-off-by: Imran Shaik <quic_imrashai@quicinc.com>
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>
---
 drivers/clk/qcom/clk-branch.c | 5 +++++
 drivers/clk/qcom/clk-branch.h | 2 ++
 2 files changed, 7 insertions(+)

Comments

Stephen Boyd Oct. 15, 2022, 12:20 a.m. UTC | #1 
Quoting Melody Olvera (2022-10-14 15:10:08)
> diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
> index f869fc6aaed6..b5dc1f4ef277 100644
> --- a/drivers/clk/qcom/clk-branch.c
> +++ b/drivers/clk/qcom/clk-branch.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
>   * Copyright (c) 2013, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
>   */
>  
>  #include <linux/kernel.h>
> @@ -56,6 +57,10 @@ static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
>  
>         if (enabling) {
>                 val &= mask;
> +
> +               if (br->halt_check == BRANCH_HALT_INVERT)
> +                       return (val & BRANCH_CLK_OFF) == BRANCH_CLK_OFF;
> +
>                 return (val & BRANCH_CLK_OFF) == 0 ||
>                         val == BRANCH_NOC_FSM_STATUS_ON;
>         } else {
> diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
> index 17a58119165e..4ac1debeb91e 100644
> --- a/drivers/clk/qcom/clk-branch.h
> +++ b/drivers/clk/qcom/clk-branch.h
> @@ -1,5 +1,6 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  /* Copyright (c) 2013, The Linux Foundation. All rights reserved. */
> +/* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved. */
>  
>  #ifndef __QCOM_CLK_BRANCH_H__
>  #define __QCOM_CLK_BRANCH_H__
> @@ -33,6 +34,7 @@ struct clk_branch {
>  #define BRANCH_HALT_ENABLE_VOTED       (BRANCH_HALT_ENABLE | BRANCH_VOTED)
>  #define BRANCH_HALT_DELAY              2 /* No bit to check; just delay */
>  #define BRANCH_HALT_SKIP               3 /* Don't check halt bit */
> +#define BRANCH_HALT_INVERT             4 /* Invert logic for halt bit */

How is it different from BRANCH_HALT vs. BRANCH_HALT_ENABLE?
Melody Olvera Oct. 19, 2022, 11:49 p.m. UTC | #2 
On 10/14/2022 5:20 PM, Stephen Boyd wrote:
> Quoting Melody Olvera (2022-10-14 15:10:08)
>> diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
>> index f869fc6aaed6..b5dc1f4ef277 100644
>> --- a/drivers/clk/qcom/clk-branch.c
>> +++ b/drivers/clk/qcom/clk-branch.c
>> @@ -1,6 +1,7 @@
>>  // SPDX-License-Identifier: GPL-2.0
>>  /*
>>   * Copyright (c) 2013, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
>>   */
>>  
>>  #include <linux/kernel.h>
>> @@ -56,6 +57,10 @@ static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
>>  
>>         if (enabling) {
>>                 val &= mask;
>> +
>> +               if (br->halt_check == BRANCH_HALT_INVERT)
>> +                       return (val & BRANCH_CLK_OFF) == BRANCH_CLK_OFF;
>> +
>>                 return (val & BRANCH_CLK_OFF) == 0 ||
>>                         val == BRANCH_NOC_FSM_STATUS_ON;
>>         } else {
>> diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
>> index 17a58119165e..4ac1debeb91e 100644
>> --- a/drivers/clk/qcom/clk-branch.h
>> +++ b/drivers/clk/qcom/clk-branch.h
>> @@ -1,5 +1,6 @@
>>  /* SPDX-License-Identifier: GPL-2.0 */
>>  /* Copyright (c) 2013, The Linux Foundation. All rights reserved. */
>> +/* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved. */
>>  
>>  #ifndef __QCOM_CLK_BRANCH_H__
>>  #define __QCOM_CLK_BRANCH_H__
>> @@ -33,6 +34,7 @@ struct clk_branch {
>>  #define BRANCH_HALT_ENABLE_VOTED       (BRANCH_HALT_ENABLE | BRANCH_VOTED)
>>  #define BRANCH_HALT_DELAY              2 /* No bit to check; just delay */
>>  #define BRANCH_HALT_SKIP               3 /* Don't check halt bit */
>> +#define BRANCH_HALT_INVERT             4 /* Invert logic for halt bit */
> How is it different from BRANCH_HALT vs. BRANCH_HALT_ENABLE?
Main difference here is in how other parts of the register are checked to see if halting
happened or not. Turns out the clocks that use this can be reconfigured to be a little
more friendly to the code already submitted, so this patch isn't necessary. I'll drop it
in the next PS.

Thanks,
Melody
diff mbox series

Patch

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index f869fc6aaed6..b5dc1f4ef277 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -1,6 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -56,6 +57,10 @@  static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
 
 	if (enabling) {
 		val &= mask;
+
+		if (br->halt_check == BRANCH_HALT_INVERT)
+			return (val & BRANCH_CLK_OFF) == BRANCH_CLK_OFF;
+
 		return (val & BRANCH_CLK_OFF) == 0 ||
 			val == BRANCH_NOC_FSM_STATUS_ON;
 	} else {
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 17a58119165e..4ac1debeb91e 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -1,5 +1,6 @@ 
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright (c) 2013, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved. */
 
 #ifndef __QCOM_CLK_BRANCH_H__
 #define __QCOM_CLK_BRANCH_H__
@@ -33,6 +34,7 @@  struct clk_branch {
 #define BRANCH_HALT_ENABLE_VOTED	(BRANCH_HALT_ENABLE | BRANCH_VOTED)
 #define BRANCH_HALT_DELAY		2 /* No bit to check; just delay */
 #define BRANCH_HALT_SKIP		3 /* Don't check halt bit */
+#define BRANCH_HALT_INVERT		4 /* Invert logic for halt bit */
 
 	struct clk_regmap clkr;
 };