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drm: provide a helper for the encoder possible_crtcs mask

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The encoder possible_crtcs mask identifies which CRTCs can be bound to
a particular encoder.  Each bit from bit 0 defines an index in the list
of CRTCs held in the DRM mode_config crtc_list.  Rather than having
drivers trying to track the position of their CRTCs in the list, expose
the code which already exists for calculating the appropriate mask bit
for a CRTC.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[treding@nvidia.com: add drm_crtc_index(), move to core]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Russell King
2014-01-02 21:27:33 +00:00
committed by Thierry Reding
parent ff5009ef8d
commit db5f7a6e78
3 changed files with 37 additions and 17 deletions
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18
drivers/gpu/drm/drm_crtc_helper.c
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@@ -334,23 +334,7 @@ EXPORT_SYMBOL(drm_helper_disable_unused_functions);
static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
struct drm_crtc *crtc)
{
struct drm_device *dev;
struct drm_crtc *tmp;
int crtc_mask = 1;
WARN(!crtc, "checking null crtc?\n");
dev = crtc->dev;
list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
if (tmp == crtc)
break;
crtc_mask <<= 1;
}
if (encoder->possible_crtcs & crtc_mask)
return true;
return false;
return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
}
/*