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drm/i915/psr: Check if resolution is supported by default SU granularity
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. v3: - Changes in the comments and commit message(Dhinakaran) - Printing the hdisplay that do not match with default granularity Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181204003403.23361-8-jose.souza@intel.com
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@ -536,6 +536,17 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
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return false;
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}
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/*
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* HW sends SU blocks of size four scan lines, which means the starting
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* X coordinate and Y granularity requirements will always be met. We
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* only need to validate the SU block width is a multiple of 4.
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*/
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if (crtc_hdisplay % 4) {
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DRM_DEBUG_KMS("PSR2 not enabled, hdisplay(%d) not multiple of 4\n",
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crtc_hdisplay);
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return false;
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}
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return true;
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}
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