linux-kernel - [PATCH 2/4] pmdomain: ti: Fix STANDBY handling of PER power domain

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Message-Id: <20250318230042.3138542-3-sbellary@baylibre.com>
Date: Tue, 18 Mar 2025 16:00:40 -0700
From: Sukrut Bellary <sbellary@...libre.com>
To: Kevin Hilman <khilman@...libre.com>,
	Russell King <linux@...linux.org.uk>,
	Rob Herring <robh@...nel.org>,
	Tony Lindgren <tony@...mide.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Nishanth Menon <nm@...com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc: Sukrut Bellary <sbellary@...libre.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Andreas Kemnade <andreas@...nade.info>,
	Roger Quadros <rogerq@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Bajjuri Praneeth <praneeth@...com>,
	Raghavendra Vignesh <vigneshr@...com>,
	Bin Liu <b-liu@...com>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH 2/4] pmdomain: ti: Fix STANDBY handling of PER power domain

Per AM335x TRM[1](section 8.1.4.3 Power mode), in case of STANDBY,
PER domain should be ON. So, fix the PER power domain handling on standby.

[1] https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf

Signed-off-by: Sukrut Bellary <sbellary@...libre.com>
---
 drivers/pmdomain/ti/omap_prm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pmdomain/ti/omap_prm.c b/drivers/pmdomain/ti/omap_prm.c
index b8ceb3c2b81c..7e36e675a8c6 100644
--- a/drivers/pmdomain/ti/omap_prm.c
+++ b/drivers/pmdomain/ti/omap_prm.c
@@ -18,7 +18,9 @@
 #include <linux/pm_domain.h>
 #include <linux/reset-controller.h>
 #include <linux/delay.h>
-
+#if IS_ENABLED(CONFIG_SUSPEND)
+#include <linux/suspend.h>
+#endif
 #include <linux/platform_data/ti-prm.h>
 
 enum omap_prm_domain_mode {
@@ -88,6 +90,7 @@ struct omap_reset_data {
 #define OMAP_PRM_HAS_RSTST	BIT(1)
 #define OMAP_PRM_HAS_NO_CLKDM	BIT(2)
 #define OMAP_PRM_RET_WHEN_IDLE	BIT(3)
+#define OMAP_PRM_ON_WHEN_STANDBY	BIT(4)
 
 #define OMAP_PRM_HAS_RESETS	(OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_HAS_RSTST)
 
@@ -404,7 +407,8 @@ static const struct omap_prm_data am3_prm_data[] = {
 		.name = "per", .base = 0x44e00c00,
 		.pwrstctrl = 0xc, .pwrstst = 0x8, .dmap = &omap_prm_noinact,
 		.rstctrl = 0x0, .rstmap = am3_per_rst_map,
-		.flags = OMAP_PRM_HAS_RSTCTRL, .clkdm_name = "pruss_ocp"
+		.flags = OMAP_PRM_HAS_RSTCTRL | OMAP_PRM_ON_WHEN_STANDBY,
+		.clkdm_name = "pruss_ocp",
 	},
 	{
 		.name = "wkup", .base = 0x44e00d00,
-- 
2.34.1