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drm/imx: ipuv3-plane: fix PRG modifiers after drm managed resource conversion 

The conversion to drm managed resources introduced two bugs: the plane is now
always initialized with the linear-only list, while the list with the Vivante
GPU modifiers should have been used when the PRG/PRE engines are present. This
masked another issue, as ipu_plane_format_mod_supported() is now called before
the private plane data is set up, so if a non-linear modifier is supplied in
the plane modifier list, we run into a NULL pointer dereference checking for
the PRG presence. To fix this just remove the check from this function, as we
know that it will only be called with a non-linear modifier, if the plane init
code has already determined that the PRG/PRE is present.

Fixes: 699e7e543f ("drm/imx: ipuv3-plane: use drm managed resources")
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Link: https://lore.kernel.org/r/20210510145927.988661-1-l.stach@pengutronix.de
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Lucas Stach 2021-05-10 16:59:27 +02:00 committed by Philipp Zabel
parent 11e3c67668
commit 17b9a94656
1 changed files with 9 additions and 7 deletions
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16
drivers/gpu/drm/imx/ipuv3-plane.c
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@ -349,10 +349,11 @@ static bool ipu_plane_format_mod_supported(struct drm_plane *plane,
if (modifier == DRM_FORMAT_MOD_LINEAR)
return true;
/* without a PRG there are no supported modifiers */
if (!ipu_prg_present(ipu))
return false;
/*
* Without a PRG the possible modifiers list only includes the linear
* modifier, so we always take the early return from this function and
* only end up here if the PRG is present.
*/
return ipu_prg_format_supported(ipu, format, modifier);
}
@ -878,6 +879,10 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
formats = ipu_plane_rgb_formats;
format_count = ARRAY_SIZE(ipu_plane_rgb_formats);
}
if (ipu_prg_present(ipu))
modifiers = pre_format_modifiers;
ipu_plane = drmm_universal_plane_alloc(dev, struct ipu_plane, base,
possible_crtcs, &ipu_plane_funcs,
formats, format_count, modifiers,
@ -892,9 +897,6 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
ipu_plane->dma = dma;
ipu_plane->dp_flow = dp;
if (ipu_prg_present(ipu))
modifiers = pre_format_modifiers;
drm_plane_helper_add(&ipu_plane->base, &ipu_plane_helper_funcs);
if (dp == IPU_DP_FLOW_SYNC_BG || dp == IPU_DP_FLOW_SYNC_FG)