From 1d118965965f89948236ebe23072bb1fca5e7832 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 27 Jan 2022 14:51:16 +0100
Subject: [PATCH] drm/vc4: hdmi: Allow DBLCLK modes even if horz timing is odd.
Git-commit: 1d118965965f89948236ebe23072bb1fca5e7832
Patch-mainline: v5.17-rc4
References: git-fixes
The 2711 pixel valve can't produce odd horizontal timings, and
checks were added to vc4_hdmi_encoder_atomic_check and
vc4_hdmi_encoder_mode_valid to filter out/block selection of
such modes.
Modes with DRM_MODE_FLAG_DBLCLK double all the horizontal timing
values before programming them into the PV. The PV values,
therefore, can not be odd, and so the modes can be supported.
Amend the filtering appropriately.
Fixes: 57fb32e632be ("drm/vc4: hdmi: Block odd horizontal timings")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220127135116.298278-1-maxime@cerno.tech
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 6d5a6388ca1e..b30500405fa7 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1245,6 +1245,7 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
unsigned long long tmds_rate;
if (vc4_hdmi->variant->unsupported_odd_h_timings &&
+ !(mode->flags & DRM_MODE_FLAG_DBLCLK) &&
((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
(mode->hsync_end % 2) || (mode->htotal % 2)))
return -EINVAL;
@@ -1292,6 +1293,7 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
if (vc4_hdmi->variant->unsupported_odd_h_timings &&
+ !(mode->flags & DRM_MODE_FLAG_DBLCLK) &&
((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
(mode->hsync_end % 2) || (mode->htotal % 2)))
return MODE_H_ILLEGAL;
--
2.31.1