[Intel-gfx] [PATCH] drm/i915: fix device info for devices without display

* [Intel-gfx] [PATCH] drm/i915: fix device info for devices without display
@ 2022-09-16  8:26 Jani Nikula
  2022-09-16  9:21 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for " Patchwork
                   ` (4 more replies)
  0 siblings, 5 replies; 11+ messages in thread
From: Jani Nikula @ 2022-09-16  8:26 UTC (permalink / raw)
  To: intel-gfx; +Cc: jani.nikula, Lucas De Marchi

Commit 00c6cbfd4e8a ("drm/i915: move pipe_mask and cpu_transcoder_mask
to runtime info") moved the pipe_mask member from struct
intel_device_info to intel_runtime_info, but overlooked some of our
platforms initializing device info .display = {}. This is significant,
as pipe_mask is the single point of truth for a device having a display
or not; the platforms in question left pipe_mask to whatever was set for
the platforms they "inherit" from in the complex macro scheme we have.

Add new NO_DISPLAY macro initializing .__runtime.pipe_mask = 0, which
will cause the device info .display sub-struct to be zeroed in
intel_device_info_runtime_init(). A better solution (or simply audit of
proper use of HAS_DISPLAY() checks) is required before moving forward
with [1].

Also clear all the display related members in runtime info if there's no
display. The latter is a bit tedious, but it's for completeness at this
time, to ensure similar functionality as before.

[1] https://lore.kernel.org/r/dfda1bf67f02ceb07c280b7a13216405fd1f7a34.1660137416.git.jani.nikula@intel.com

Fixes: 00c6cbfd4e8a ("drm/i915: move pipe_mask and cpu_transcoder_mask to runtime info")
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Maarten Lankhort <maarten.lankhorst@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_pci.c          | 11 ++++++-----
 drivers/gpu/drm/i915/intel_device_info.c |  6 ++++++
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 77e7df21f539..cd4487a1d3be 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -41,6 +41,8 @@
 	.__runtime.media.ip.ver = (x), \
 	.__runtime.display.ip.ver = (x)
 
+#define NO_DISPLAY .__runtime.pipe_mask = 0
+
 #define I845_PIPE_OFFSETS \
 	.display.pipe_offsets = { \
 		[TRANSCODER_A] = PIPE_A_OFFSET,	\
@@ -519,9 +521,8 @@ static const struct intel_device_info ivb_m_gt2_info = {
 static const struct intel_device_info ivb_q_info = {
 	GEN7_FEATURES,
 	PLATFORM(INTEL_IVYBRIDGE),
+	NO_DISPLAY,
 	.gt = 2,
-	.__runtime.pipe_mask = 0, /* legal, last one wins */
-	.__runtime.cpu_transcoder_mask = 0,
 	.has_l3_dpf = 1,
 };
 
@@ -1039,7 +1040,7 @@ static const struct intel_device_info xehpsdv_info = {
 	XE_HPM_FEATURES,
 	DGFX_FEATURES,
 	PLATFORM(INTEL_XEHPSDV),
-	.display = { },
+	NO_DISPLAY,
 	.has_64k_pages = 1,
 	.needs_compact_pt = 1,
 	.has_media_ratio_mode = 1,
@@ -1081,7 +1082,7 @@ static const struct intel_device_info dg2_info = {
 
 static const struct intel_device_info ats_m_info = {
 	DG2_FEATURES,
-	.display = { 0 },
+	NO_DISPLAY,
 	.require_force_probe = 1,
 	.tuning_thread_rr_after_dep = 1,
 };
@@ -1103,7 +1104,7 @@ static const struct intel_device_info pvc_info = {
 	.__runtime.graphics.ip.rel = 60,
 	.__runtime.media.ip.rel = 60,
 	PLATFORM(INTEL_PONTEVECCHIO),
-	.display = { 0 },
+	NO_DISPLAY,
 	.has_flat_ccs = 0,
 	.__runtime.platform_engine_mask =
 		BIT(BCS0) |
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 1434dc33cf49..20575eb77ea7 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -433,8 +433,14 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 		dev_priv->drm.driver_features &= ~(DRIVER_MODESET |
 						   DRIVER_ATOMIC);
 		memset(&info->display, 0, sizeof(info->display));
+
+		runtime->cpu_transcoder_mask = 0;
 		memset(runtime->num_sprites, 0, sizeof(runtime->num_sprites));
 		memset(runtime->num_scalers, 0, sizeof(runtime->num_scalers));
+		runtime->fbc_mask = 0;
+		runtime->has_hdcp = false;
+		runtime->has_dmc = false;
+		runtime->has_dsc = false;
 	}
 }
 
-- 
2.34.1


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