linux-kernel - [PATCH 2/2] drm/nouveau/bios/init: handle INIT_RESET

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Message-Id: <20190602141315.6197-3-rhyskidd@gmail.com>
Date:   Mon,  3 Jun 2019 00:13:15 +1000
From:   Rhys Kidd <rhyskidd@...il.com>
To:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     Rhys Kidd <rhyskidd@...il.com>
Subject: [PATCH 2/2] drm/nouveau/bios/init: handle INIT_RESET_END devinit opcode

Signal that the reset sequence has completed.

This opcode signals that the software reset sequence has completed.
Ordinarily, no actual operations are performed by the opcode.
However it allows for possible software work arounds by devinit
engines in software agents other than the VBIOS, such as the resman,
FCODE, and EFI driver.

Signed-off-by: Rhys Kidd <rhyskidd@...il.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/bios/init.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/init.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/init.c
index a54b5e410dcd..49d09503cd31 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/init.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/init.c
@@ -1945,6 +1945,17 @@ init_reset_begun(struct nvbios_init *init)
 	init->offset += 1;
 }
 
+/**
+ * INIT_RESET_END - opcode 0x8d
+ *
+ */
+static void
+init_reset_end(struct nvbios_init *init)
+{
+	trace("RESET_END\n");
+	init->offset += 1;
+}
+
 /**
  * INIT_GPIO - opcode 0x8e
  *
@@ -2272,7 +2283,7 @@ static struct nvbios_init_opcode {
 	[0x7a] = { init_zm_reg },
 	[0x87] = { init_ram_restrict_pll },
 	[0x8c] = { init_reset_begun },
-	[0x8d] = { init_reserved },
+	[0x8d] = { init_reset_end },
 	[0x8e] = { init_gpio },
 	[0x8f] = { init_ram_restrict_zm_reg_group },
 	[0x90] = { init_copy_zm_reg },
-- 
2.20.1