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From bf952ebc80e84adf6d5849efd17dafa5f9d7a6a2 Mon Sep 17 00:00:00 2001
From: Mahesh Kumar <mahesh1.kumar@intel.com>
Date: Fri, 13 Jul 2018 19:29:33 +0530
Subject: [PATCH 0811/2940] 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
---
drivers/gpu/drm/drm_debugfs_crc.c | 8 ++++++++
include/drm/drm_crtc.h | 18 ++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 6e4734f55f97..ef1f449582ba 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -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) {
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index d089431a252c..9360f057effd 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -745,6 +745,24 @@ struct drm_crtc_funcs {
* 0 on success or a negative error code on failure.
*/
int (*set_crc_source)(struct drm_crtc *crtc, const char *source);
+
+ /**
+ * @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:
*
--
2.17.1
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