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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jan200101 <sentrycraft123@gmail.com>
Date: Wed, 8 Mar 2023 20:51:16 +0100
Subject: [PATCH] drm/i915: add kernel parameter to disable async page flipping
Signed-off-by: Jan200101 <sentrycraft123@gmail.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 2 +-
drivers/gpu/drm/i915/i915_params.c | 4 ++++
drivers/gpu/drm/i915/i915_params.h | 3 ++-
3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index de77054195c6..43dbab8c46d0 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -8600,7 +8600,7 @@ static void intel_mode_config_init(struct drm_i915_private *i915)
mode_config->funcs = &intel_mode_funcs;
mode_config->helper_private = &intel_mode_config_funcs;
- mode_config->async_page_flip = HAS_ASYNC_FLIPS(i915);
+ mode_config->async_page_flip = HAS_ASYNC_FLIPS(i915) && !i915->params.disable_async_page_flip;
/*
* Maximum framebuffer dimensions, chosen to match
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index d1e4d528cb17..b1281fcdc47b 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -219,6 +219,10 @@ i915_param_named_unsafe(lmem_size, uint, 0400,
i915_param_named_unsafe(lmem_bar_size, uint, 0400,
"Set the lmem bar size(in MiB).");
+i915_param_named_unsafe(disable_async_page_flip, bool, 0400,
+ "Disable async page flipping"
+ "(0=disabled [default], 1=enabled)");
+
static __always_inline void _print_param(struct drm_printer *p,
const char *name,
const char *type,
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 2733cb6cfe09..d7b891bbd12b 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -84,7 +84,8 @@ struct drm_printer;
param(bool, verbose_state_checks, true, 0) \
param(bool, nuclear_pageflip, false, 0400) \
param(bool, enable_dp_mst, true, 0600) \
- param(bool, enable_gvt, false, IS_ENABLED(CONFIG_DRM_I915_GVT) ? 0400 : 0)
+ param(bool, enable_gvt, false, IS_ENABLED(CONFIG_DRM_I915_GVT) ? 0400 : 0) \
+ param(bool, disable_async_page_flip, false, 0400)
#define MEMBER(T, member, ...) T member;
struct i915_params {
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