From 68e94f62cfbe1650fb783979150a2b2f0a3eca1c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Tue, 29 Jan 2019 16:19:13 +0200
Subject: [PATCH] drm/i915/tv: Bypass the vertical filter if possible
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Let's switch the pipe into interlaced mode and switch off
the TV encoder vertical filter if the pipe vdisplay
matches the TV YSIZE exactly.
While I didn't measure it I presume this might reduce
the power consumption a little bit, and the pixel rate
is halved as the pipe will now fetching in interlaced
mode rather than in progressive mode (effectively the
same difference as between IF-ID vs. PF-ID pfit modes
on more modern hardware) so a bit easier on the memory
bandwidth.
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190129141913.5515-2-ville.syrjala@linux.intel.com
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/intel_tv.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 3a5682f44e555..3924c4944e1f0 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -1159,6 +1159,22 @@ intel_tv_get_config(struct intel_encoder *encoder,
I915_MODE_FLAG_USE_SCANLINE_COUNTER;
}
+static bool intel_tv_source_too_wide(struct drm_i915_private *dev_priv,
+ int hdisplay)
+{
+ return IS_GEN(dev_priv, 3) && hdisplay > 1024;
+}
+
+static bool intel_tv_vert_scaling(const struct drm_display_mode *tv_mode,
+ const struct drm_connector_state *conn_state,
+ int vdisplay)
+{
+ return tv_mode->crtc_vdisplay -
+ conn_state->tv.margins.top -
+ conn_state->tv.margins.bottom !=
+ vdisplay;
+}
+
static int
intel_tv_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
@@ -1189,7 +1205,8 @@ intel_tv_compute_config(struct intel_encoder *encoder,
intel_tv_mode_to_mode(adjusted_mode, tv_mode);
drm_mode_set_crtcinfo(adjusted_mode, 0);
- if (IS_GEN(dev_priv, 3) && hdisplay > 1024) {
+ if (intel_tv_source_too_wide(dev_priv, hdisplay) ||
+ !intel_tv_vert_scaling(adjusted_mode, conn_state, vdisplay)) {
int extra, top, bottom;
extra = adjusted_mode->crtc_vdisplay - vdisplay;
--
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