linux-kernel - [PATCH] drm/panfrost: Add GPU_PM

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Message-ID: <20251203125104.67596-1-biju.das.jz@bp.renesas.com>
Date: Wed,  3 Dec 2025 12:51:01 +0000
From: Biju <biju.das.au@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>
Subject: [PATCH] drm/panfrost: Add GPU_PM_RT support for RZ/G3E SoC

From: Biju Das <biju.das.jz@...renesas.com>

RZ/G3E SoC is embedded with Mali-G52 GPU system. The system hangs after
STR in the following condition:

STR -> Wakeup from STR -> Unload panfrost using 'modprobe -r panfrost'.

Fix this issue by asserting/deasserting the reset during suspend/resume.
Rename the variable allwinner_h616_data->default_pm_rt_data for data
reuse and make it as generic GPU PM runtime data.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 7d8c7c337606..e553f183c780 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -976,7 +976,7 @@ static const struct panfrost_compatible default_data = {
 	.pm_domain_names = NULL,
 };
 
-static const struct panfrost_compatible allwinner_h616_data = {
+static const struct panfrost_compatible default_pm_rt_data = {
 	.num_supplies = ARRAY_SIZE(default_supplies) - 1,
 	.supply_names = default_supplies,
 	.num_pm_domains = 1,
@@ -1056,6 +1056,7 @@ static const struct of_device_id dt_match[] = {
 	  .data = &amlogic_data, },
 	{ .compatible = "amlogic,meson-g12a-mali",
 	  .data = &amlogic_data, },
+	{ .compatible = "renesas,r9a09g047-mali", .data = &default_pm_rt_data },
 	{ .compatible = "arm,mali-t604", .data = &default_data, },
 	{ .compatible = "arm,mali-t624", .data = &default_data, },
 	{ .compatible = "arm,mali-t628", .data = &default_data, },
@@ -1073,7 +1074,7 @@ static const struct of_device_id dt_match[] = {
 	{ .compatible = "mediatek,mt8188-mali", .data = &mediatek_mt8188_data },
 	{ .compatible = "mediatek,mt8192-mali", .data = &mediatek_mt8192_data },
 	{ .compatible = "mediatek,mt8370-mali", .data = &mediatek_mt8370_data },
-	{ .compatible = "allwinner,sun50i-h616-mali", .data = &allwinner_h616_data },
+	{ .compatible = "allwinner,sun50i-h616-mali", .data = &default_pm_rt_data },
 	{}
 };
 MODULE_DEVICE_TABLE(of, dt_match);
-- 
2.43.0