linux-kernel - [PATCH v1 1/1] bus: ti-sysc: PRUSS OCP configuration

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Message-Id: <20250407072134.1044797-2-parvathi@couthit.com>
Date: Mon,  7 Apr 2025 12:51:34 +0530
From: Parvathi Pudi <parvathi@...thit.com>
To: aaro.koskinen@....fi,
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Subject: [PATCH v1 1/1] bus: ti-sysc: PRUSS OCP configuration

Updates OCP master port configuration to enable memory access outside
of the PRU-ICSS subsystem.

This set of changes configures PRUSS_SYSCFG.STANDBY_INIT bit to enable
the OCP master ports during resume sequence and disables the OCP master
ports during suspend sequence (applicable only on SoCs using OCP
interconnect like the OMAP family).

Signed-off-by: Parvathi Pudi <parvathi@...thit.com>
---
 drivers/bus/ti-sysc.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index f67b927ae4ca..51caae611acf 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -2036,6 +2036,19 @@ static void sysc_module_disable_quirk_pruss(struct sysc *ddata)
 	sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
 }
 
+static void sysc_module_enable_quirk_pruss(struct sysc *ddata)
+{
+	u32 reg;
+
+	reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+	/* Clearing the SYSC_PRUSS_STANDBY_INIT bit - Updates OCP master
+	 * port configuration to enable memory access outside of the
+	 * PRU-ICSS subsystem.
+	 */
+	reg &= (~SYSC_PRUSS_STANDBY_INIT);
+	sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
+}
+
 static void sysc_init_module_quirks(struct sysc *ddata)
 {
 	if (ddata->legacy_mode || !ddata->name)
@@ -2088,8 +2101,10 @@ static void sysc_init_module_quirks(struct sysc *ddata)
 		ddata->module_disable_quirk = sysc_reset_done_quirk_wdt;
 	}
 
-	if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_PRUSS)
+	if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_PRUSS) {
+		ddata->module_enable_quirk = sysc_module_enable_quirk_pruss;
 		ddata->module_disable_quirk = sysc_module_disable_quirk_pruss;
+	}
 }
 
 static int sysc_clockdomain_init(struct sysc *ddata)
-- 
2.34.1