Selective updates have a default granularity requirements as stated
by eDP spec(PSR2 SELECTIVE UPDATE X GRANULARITY CAPABILITY register
definition), so check if HW can match those requirements before
enabling PSR2.
v2:
- Changes in the comments and commit message(Dhinakaran)
- Printing the hdisplay that do not match with default granularity
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_psr.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 40a81e084a96..0aa909018c53 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -536,6 +536,17 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
return false;
}
+ /*
+ * HW sends SU blocks of size four scan lines, which means the starting
+ * X coordinate and Y granularity requirements will always be met. We
+ * only need to validate the SU block width is a multiple of 4.
+ */
+ if (crtc_hdisplay % 4) {
+ DRM_DEBUG_KMS("PSR2 not enabled, hdisplay(%d) not multiple of 4\n",
+ crtc_hdisplay);
+ return false;
+ }
+
return true;
}
--
2.19.2
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