[PATCH 1/1][SRU][D/E] UBUNTU: SAUCE: drm/i915: Disable PSR by default on all platforms

[Sultan Alsawaf]

BugLink: https://bugs.launchpad.net/bugs/1849947

On all Dell laptops with screens and chipsets that support PSR, both
PSR1 and PSR2 cause flickering and graphical glitches. Many laptops
don't support PSR so it isn't known if PSR works correctly on any
consumer hardware. PSR was enabled by default in 5.0 for capable
hardware, so this patch just restores the previous functionality of PSR
being disabled by default.

More info is available on the freedesktop bug:
https://gitlab.freedesktop.org/drm/intel/issues/425

Signed-off-by: Sultan Alsawaf <sultan.alsawaf at canonical.com>
---
 drivers/gpu/drm/i915/i915_params.c | 3 +--
 drivers/gpu/drm/i915/i915_params.h | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 5b07766a1c26..71953f4e019f 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -84,8 +84,7 @@ i915_param_named_unsafe(enable_hangcheck, bool, 0600,
 
 i915_param_named_unsafe(enable_psr, int, 0600,
 	"Enable PSR "
-	"(0=disabled, 1=enabled) "
-	"Default: -1 (use per-chip default)");
+	"(-1=use per-chip default, 0=disabled [default], 1=enabled) ");
 
 i915_param_named_unsafe(force_probe, charp, 0400,
 	"Force probe the driver for specified devices. "
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index a4770ce46bd2..d0167c5f47ff 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -50,7 +50,7 @@ struct drm_printer;
 	param(int, vbt_sdvo_panel_type, -1) \
 	param(int, enable_dc, -1) \
 	param(int, enable_fbc, -1) \
-	param(int, enable_psr, -1) \
+	param(int, enable_psr, 0) \
 	param(int, disable_power_well, -1) \
 	param(int, enable_ips, 1) \
 	param(int, invert_brightness, 0) \
-- 
2.20.1