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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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23
drivers/gpu/drm/drm_crtc.c
View File

@ -674,6 +674,29 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
}
EXPORT_SYMBOL(drm_crtc_cleanup);
/**
* drm_crtc_index - find the index of a registered CRTC
* @crtc: CRTC to find index for
*
* Given a registered CRTC, return the index of that CRTC within a DRM
* device's list of CRTCs.
*/
unsigned int drm_crtc_index(struct drm_crtc *crtc)
{
unsigned int index = 0;
struct drm_crtc *tmp;
list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
if (tmp == crtc)
return index;
index++;
}
BUG();
}
EXPORT_SYMBOL(drm_crtc_index);
/**
* drm_mode_probed_add - add a mode to a connector's probed mode list
* @connector: connector the new mode

18
drivers/gpu/drm/drm_crtc_helper.c
View File

@ -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));
}
/*

13
include/drm/drm_crtc.h
View File

@ -929,6 +929,19 @@ extern int drm_crtc_init(struct drm_device *dev,
struct drm_crtc *crtc,
const struct drm_crtc_funcs *funcs);
extern void drm_crtc_cleanup(struct drm_crtc *crtc);
extern unsigned int drm_crtc_index(struct drm_crtc *crtc);
/**
* drm_crtc_mask - find the mask of a registered CRTC
* @crtc: CRTC to find mask for
*
* Given a registered CRTC, return the mask bit of that CRTC for an
* encoder's possible_crtcs field.
*/
static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc)
{
return 1 << drm_crtc_index(crtc);
}
extern void drm_connector_ida_init(void);
extern void drm_connector_ida_destroy(void);