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drm: crc: Introduce verify_crc_source callback 

This patch adds a new callback function "verify_crc_source" which will
be used during setting the crc source in control node. This will help
in avoiding setting of wrong string for source.

Changes since V1:
 - do not yet verify_crc_source during open.
Changes since V1:
 - improve callback description

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/20180713135942.25061-2-mahesh1.kumar@intel.com
hifive-unleashed-5.1
Mahesh Kumar 2018-07-13 19:29:33 +05:30 committed by Maarten Lankhorst
parent eec97cd367
commit d5cc15a0c6
2 changed files with 24 additions and 0 deletions
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8
drivers/gpu/drm/drm_debugfs_crc.c
View File

@ -87,6 +87,8 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
struct drm_crtc *crtc = m->private;
struct drm_crtc_crc *crc = &crtc->crc;
char *source;
size_t values_cnt;
int ret;
if (len == 0)
return 0;
@ -104,6 +106,12 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
if (source[len] == '\n')
source[len] = '\0';
if (crtc->funcs->verify_crc_source) {
ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt);
if (ret)
return ret;
}
spin_lock_irq(&crc->lock);
if (crc->opened) {

16
include/drm/drm_crtc.h
View File

@ -746,6 +746,22 @@ struct drm_crtc_funcs {
*/
int (*set_crc_source)(struct drm_crtc *crtc, const char *source,
size_t *values_cnt);
/**
* @verify_crc_source:
*
* verifies the source of CRC checksums of frames before setting the
* source for CRC and during crc open. Source parameter can be NULL
* while disabling crc source.
*
* This callback is optional if the driver does not support any CRC
* generation functionality.
*
* RETURNS:
*
* 0 on success or a negative error code on failure.
*/
int (*verify_crc_source)(struct drm_crtc *crtc, const char *source,
size_t *values_cnt);
/**
* @atomic_print_state: