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drm: crc: Introduce get_crc_sources callback

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This patch introduce a callback function "get_crc_sources" which
will be called during read of control node. It is an optional
callback function and if driver implements this callback, driver
should return a constant pointer to an array of crc sources list
and update count according to the number of source in the list.

Changes Since V1: (Daniel)
 - return const pointer to an array of crc sources list
 - do validation of sources in CRC-core
Changes Since V2:
 - update commit message
 - update callback documentation
 - print one source name per line

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180713135942.25061-3-mahesh1.kumar@intel.com
This commit is contained in:
Mahesh Kumar
2018-07-13 19:29:34 +05:30
committed by Maarten Lankhorst
parent d5cc15a0c6
commit 4396551e9c
2 changed files with 44 additions and 1 deletions
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22
include/drm/drm_crtc.h
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@@ -762,6 +762,28 @@ struct drm_crtc_funcs {
*/
int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
size_t *values_cnt);
/**
* @get_crc_sources:
*
* Driver callback for getting a list of all the available sources for
* CRC generation. This callback depends upon verify_crc_source, So
* verify_crc_source callback should be implemented before implementing
* this. Driver can pass full list of available crc sources, this
* callback does the verification on each crc-source before passing it
* to userspace.
*
* This callback is optional if the driver does not support exporting of
* possible CRC sources list.
*
* RETURNS:
*
* a constant character pointer to the list of all the available CRC
* sources. On failure driver should return NULL. count should be
* updated with number of sources in list. if zero we don't process any
* source from the list.
*/
const char *const *(*get_crc_sources)(struct drm_crtc *crtc,
size_t *count);
/**
* @atomic_print_state: