[Intel-gfx] [PATCH] drm/i915/psr: enable psr1 on psr2 panels

[vathsala nagaraju]

From: Vathsala Nagaraju <vathsala.nagaraju at intel.com>

Adds force_psr1 mod parameter to enable psr1 on psr2 panels.
useful in cases where psr2 fails and user wants to enable
psr1 feature for power saving until a fix
is provided for psr2.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju at intel.com>
---
 drivers/gpu/drm/i915/i915_params.c | 5 +++++
 drivers/gpu/drm/i915/i915_params.h | 1 +
 drivers/gpu/drm/i915/intel_psr.c   | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 08108ce..5b6f5af 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -95,6 +95,11 @@ struct i915_params i915_modparams __read_mostly = {
 	"(0=disabled, 1=enabled - link mode chosen per-platform, 2=force link-standby mode, 3=force link-off mode) "
 	"Default: -1 (use per-chip default)");
 
+i915_param_named_unsafe(force_psr1, int, 0600,
+	"Enable PSR1 on PSR2 Panel "
+	"(0=disabled, 1=enabled) "
+	"Default: -1 (use per-chip default)");
+
 i915_param_named_unsafe(alpha_support, bool, 0400,
 	"Enable alpha quality driver support for latest hardware. "
 	"See also CONFIG_DRM_I915_ALPHA_SUPPORT.");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index c963603..1f5dd1c 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -44,6 +44,7 @@
 	param(int, enable_fbc, -1) \
 	param(int, enable_ppgtt, -1) \
 	param(int, enable_psr, -1) \
+	param(int, force_psr1, -1) \
 	param(int, disable_power_well, -1) \
 	param(int, enable_ips, 1) \
 	param(int, invert_brightness, 0) \
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 2d53f73..415e377 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -540,6 +540,8 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 
 	crtc_state->has_psr = true;
 	crtc_state->has_psr2 = intel_psr2_config_valid(intel_dp, crtc_state);
+	if (i915_modparams.force_psr1 == 1 && crtc_state->has_psr2)
+		crtc_state->has_psr2 = false;
 	DRM_DEBUG_KMS("Enabling PSR%s\n", crtc_state->has_psr2 ? "2" : "");
 }
 
-- 
1.9.1