From 68e94f62cfbe1650fb783979150a2b2f0a3eca1c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Tue, 29 Jan 2019 16:19:13 +0200 Subject: [PATCH] drm/i915/tv: Bypass the vertical filter if possible MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190129141913.5515-2-ville.syrjala@linux.intel.com Acked-by: Daniel Vetter --- 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 3a5682f44e55..3924c4944e1f 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; -- 2.30.2