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drm: crc: Introduce get_crc_sources callback 

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

@ -68,8 +68,29 @@ static int crc_control_show(struct seq_file *m, void *data)
{
struct drm_crtc *crtc = m->private;
seq_printf(m, "%s\n", crtc->crc.source);
if (crtc->funcs->get_crc_sources) {
size_t count;
const char *const *sources = crtc->funcs->get_crc_sources(crtc,
&count);
size_t values_cnt;
int i;
if (count == 0 || !sources)
goto out;
for (i = 0; i < count; i++)
if (!crtc->funcs->verify_crc_source(crtc, sources[i],
&values_cnt)) {
if (strcmp(sources[i], crtc->crc.source))
seq_printf(m, "%s\n", sources[i]);
else
seq_printf(m, "%s*\n", sources[i]);
}
}
return 0;
out:
seq_printf(m, "%s*\n", crtc->crc.source);
return 0;
}

22
include/drm/drm_crtc.h
View File

@ -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: