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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jan200101 <sentrycraft123@gmail.com>
Date: Mon, 25 Sep 2023 12:29:07 +0200
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_driver.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_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
index b909814ae02b..918b8b589ec7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
@@ -121,7 +121,7 @@ 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 0a171b57fd8f..63a23458399f 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -228,6 +228,10 @@ 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 void _param_print_bool(struct drm_printer *p, const char *name,
bool val)
{
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 68abf0ad6c00..b24b30666438 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -87,7 +87,8 @@ 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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