drm/i915: print FBC compression status on debugfs (31b9df10) · Commits · e / devices / android_kernel_teracube_emerald

We already had a few bugs in the past where FBC was compressing nothing when it was enabled, which makes the feature quite useless. Add this information to debugfs so the test suites can check for regressions in this piece of the code. Our igt/tests/kms_frontbuffer_tracking already has support for this message. v2: - Remove pointless VLV check (Ville). Signed-off-by:

Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by:

Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:

Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -1638,6 +1638,11 @@ static int i915_fbc_status(struct seq_file m, void unused)
		seq_putc(m, '\n');
		}

		if (INTEL_INFO(dev_priv)->gen >= 7)
		seq_printf(m, "Compressing: %s\n",
		yesno(I915_READ(FBC_STATUS2) &
		FBC_COMPRESSION_MASK));

		intel_runtime_pm_put(dev_priv);

		return 0;

drivers/gpu/drm/i915/i915_reg.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -1951,6 +1951,9 @@ enum skl_disp_power_wells {
		#define FBC_FENCE_OFF 0x03218 /* BSpec typo has 321Bh */
		#define FBC_TAG 0x03300

		#define FBC_STATUS2 0x43214
		#define FBC_COMPRESSION_MASK 0x7ff

		#define FBC_LL_SIZE (1536)

		/* Framebuffer compression for GM45+ */