linux-kernel - [PATCH v3 5/5] drm/etnaviv: Add module parameter to force PPU flop reset

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Message-ID: <20250630202703.13844-6-gert.wollny@collabora.com>
Date: Mon, 30 Jun 2025 22:26:31 +0200
From: Gert Wollny <gert.wollny@...labora.com>
To: Lucas Stach <l.stach@...gutronix.de>,
	Russell King <linux+etnaviv@...linux.org.uk>,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>
Cc: etnaviv@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Gert Wollny <gert.wollny@...labora.com>
Subject: [PATCH v3 5/5] drm/etnaviv: Add module parameter to force PPU flop reset

v2: Check for feature PIPE_3D when forcing PPU flop reset (Lucas)

Signed-off-by: Gert Wollny <gert.wollny@...labora.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
index 138af3c33b5d..ec32128ebac5 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
@@ -16,6 +16,9 @@ enum etnaviv_flop_reset_type {
 	flop_reset_tp = 1 << 2
 };
 
+static int etnaviv_force_flop_reset = 0;
+module_param_named(force_flop_reset, etnaviv_force_flop_reset, int , 0);
+
 #define PPU_IMAGE_STRIDE 64
 #define PPU_IMAGE_XSIZE 64
 #define PPU_IMAGE_YSIZE 6
@@ -151,6 +154,20 @@ etnaviv_flop_reset_ppu_require(const struct etnaviv_chip_identity *chip_id)
 			return (e->flags & flop_reset_ppu) != 0;
 	}
 
+	if (etnaviv_force_flop_reset & flop_reset_ppu) {
+
+		if (!(chip_id->features & chipFeatures_PIPE_3D)) {
+			pr_warn("Feature PIPE_3D not supported, ignore request to force "
+				"PPU flop reset for model: 0x%04x, revision: 0x%04x\n",
+				chip_id->model, chip_id->revision);
+			return false;
+		}
+
+		pr_info("Force PPU flop reset for model: 0x%04x, revision: 0x%04x\n",
+			chip_id->model, chip_id->revision);
+		return true;
+	}
+
 	return false;
 }
 
-- 
2.49.0