linux-kernel - [PATCH v3 3/4] soc: qcom: geni-se: Do not keep GPIOs to sleep state for shared SE usecase

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Message-Id: <20240927063108.2773304-4-quic_msavaliy@quicinc.com>
Date: Fri, 27 Sep 2024 12:01:07 +0530
From: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
To: konrad.dybcio@...aro.org, andersson@...nel.org, andi.shyti@...nel.org,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        conor+dt@...nel.org, agross@...nel.org, devicetree@...r.kernel.org,
        vkoul@...nel.org, linux@...blig.org, dan.carpenter@...aro.org,
        Frank.Li@....com, konradybcio@...nel.org, bryan.odonoghue@...aro.org,
        krzk+dt@...nel.org, robh@...nel.org
Cc: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
Subject: [PATCH v3 3/4] soc: qcom: geni-se: Do not keep GPIOs to sleep state for shared SE usecase

Currently the driver provides a function called geni_serial_resources_off()
to turn off resources like clocks and  pinctrl.

For shared SE between two SS, we don't need to keep pinctrl to sleep state
as other SS may be actively transferring data over SE. Hence,bypass keeping
pinctrl to sleep state conditionally using shared_geni_se flag.

Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>
---
 drivers/soc/qcom/qcom-geni-se.c  | 14 ++++++++++----
 include/linux/soc/qcom/geni-se.h |  3 +++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
index 2e8f24d5da80..89cf18699336 100644
--- a/drivers/soc/qcom/qcom-geni-se.c
+++ b/drivers/soc/qcom/qcom-geni-se.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+// Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
 
 /* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
 #define __DISABLE_TRACE_MMIO__
@@ -503,10 +504,15 @@ int geni_se_resources_off(struct geni_se *se)
 
 	if (has_acpi_companion(se->dev))
 		return 0;
-
-	ret = pinctrl_pm_select_sleep_state(se->dev);
-	if (ret)
-		return ret;
+	/* Keep pinctrl to sleep state only for regular usecase.
+	 * Do not sleep pinctrl for shared SE because other SS(subsystems)
+	 * may continueto perform transfer.
+	 */
+	if (se->shared_geni_se == false) {
+		ret = pinctrl_pm_select_sleep_state(se->dev);
+		if (ret)
+			return ret;
+	}
 
 	geni_se_clks_off(se);
 	return 0;
diff --git a/include/linux/soc/qcom/geni-se.h b/include/linux/soc/qcom/geni-se.h
index c3bca9c0bf2c..359041c64ad8 100644
--- a/include/linux/soc/qcom/geni-se.h
+++ b/include/linux/soc/qcom/geni-se.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef _LINUX_QCOM_GENI_SE
@@ -61,6 +62,7 @@ struct geni_icc_path {
  * @num_clk_levels:	Number of valid clock levels in clk_perf_tbl
  * @clk_perf_tbl:	Table of clock frequency input to serial engine clock
  * @icc_paths:		Array of ICC paths for SE
+ * @shared_geni_se:	Tells if SE is used by two SS in shared environment.
  */
 struct geni_se {
 	void __iomem *base;
@@ -70,6 +72,7 @@ struct geni_se {
 	unsigned int num_clk_levels;
 	unsigned long *clk_perf_tbl;
 	struct geni_icc_path icc_paths[3];
+	bool shared_geni_se;
 };
 
 /* Common SE registers */
-- 
2.25.1