From: Vasiliy Kovalev kovalev@altlinux.org

This reverts commit 5a46dc8e4a064769e916d87bf9bccae75afc7289.

Commit 50b6f2c8297793f7f3315623db78dcff85158e96 upstream.

Commit 5a46dc8e4a0647 ("drm/edid: Fix csync detailed mode parsing") fixed EDID detailed mode sync parsing. Unfortunately, there are quite a few displays out there that have bogus (zero) sync field that are broken by the change. Zero means analog composite sync, which is not right for digital displays, and the modes get rejected. Regardless, it used to work, and it needs to continue to work. Revert the change.

Rejecting modes with analog composite sync was the part that fixed the gitlab issue 8146 [1]. We'll need to get back to the drawing board with that.

[1] https://gitlab.freedesktop.org/drm/intel/-/issues/8146

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8789 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8930 Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9044 Fixes: 5a46dc8e4a0647 ("drm/edid: Fix csync detailed mode parsing") Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v6.4+ Signed-off-by: Jani Nikula jani.nikula@intel.com Acked-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20230815101907.2900768-1-jani.... Signed-off-by: Vasiliy Kovalev kovalev@altlinux.org --- drivers/gpu/drm/drm_edid.c | 26 +++++++------------------- include/drm/drm_edid.h | 12 +++--------- 2 files changed, 10 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index a26c6c57a627c0..5ed77e3361fd72 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3307,6 +3307,9 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, DRM_DEBUG_KMS("stereo mode not supported\n"); return NULL; } + if (!(pt->misc & DRM_EDID_PT_SEPARATE_SYNC)) { + DRM_DEBUG_KMS("composite sync not supported\n"); + }

/* it is incorrect if hsync/vsync width is zero */ if (!hsync_pulse_width || !vsync_pulse_width) { @@ -3353,25 +3356,10 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev, if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) { mode->flags |= DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC; } else { - switch (pt->misc & DRM_EDID_PT_SYNC_MASK) { - case DRM_EDID_PT_ANALOG_CSYNC: - case DRM_EDID_PT_BIPOLAR_ANALOG_CSYNC: - drm_dbg_kms(dev, "Analog composite sync!\n"); - mode->flags |= DRM_MODE_FLAG_CSYNC | DRM_MODE_FLAG_NCSYNC; - break; - case DRM_EDID_PT_DIGITAL_CSYNC: - drm_dbg_kms(dev, "Digital composite sync!\n"); - mode->flags |= DRM_MODE_FLAG_CSYNC; - mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? - DRM_MODE_FLAG_PCSYNC : DRM_MODE_FLAG_NCSYNC; - break; - case DRM_EDID_PT_DIGITAL_SEPARATE_SYNC: - mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? - DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; - mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? - DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; - break; - } + mode->flags |= (pt->misc & DRM_EDID_PT_HSYNC_POSITIVE) ? + DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC; + mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ? + DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC; }

set_size: diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 008d2ed39822ec..1ed61e2b30a41c 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -61,15 +61,9 @@ struct std_timing { u8 vfreq_aspect; } __attribute__((packed));

-#define DRM_EDID_PT_SYNC_MASK (3 << 3) -# define DRM_EDID_PT_ANALOG_CSYNC (0 << 3) -# define DRM_EDID_PT_BIPOLAR_ANALOG_CSYNC (1 << 3) -# define DRM_EDID_PT_DIGITAL_CSYNC (2 << 3) -# define DRM_EDID_PT_CSYNC_ON_RGB (1 << 1) /* analog csync only */ -# define DRM_EDID_PT_CSYNC_SERRATE (1 << 2) -# define DRM_EDID_PT_DIGITAL_SEPARATE_SYNC (3 << 3) -# define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1) /* also digital csync */ -# define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2) +#define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1) +#define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2) +#define DRM_EDID_PT_SEPARATE_SYNC (3 << 3) #define DRM_EDID_PT_STEREO (1 << 5) #define DRM_EDID_PT_INTERLACED (1 << 7)