[Intel-gfx] [RFC v1 2/6] drm/displayid: add separate drm_displayid.c
Jani Nikula
jani.nikula at intel.com
Tue Mar 9 13:54:10 UTC 2021
We'll be adding more DisplayID specific functions going forward, so
start off by splitting out a few functions to a separate file.
We don't bother with exporting the functions; at least for now they
should be needed solely within drm.ko.
No functional changes.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
drivers/gpu/drm/Makefile | 2 +-
drivers/gpu/drm/drm_displayid.c | 59 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_edid.c | 58 ++------------------------------
include/drm/drm_displayid.h | 8 +++++
include/drm/drm_edid.h | 3 ++
5 files changed, 73 insertions(+), 57 deletions(-)
create mode 100644 drivers/gpu/drm/drm_displayid.c
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 5eb5bf7c16e3..78ef2fd14f10 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -7,7 +7,7 @@ drm-y := drm_auth.o drm_cache.o \
drm_file.o drm_gem.o drm_ioctl.o drm_irq.o \
drm_drv.o \
drm_sysfs.o drm_hashtab.o drm_mm.o \
- drm_crtc.o drm_fourcc.o drm_modes.o drm_edid.o \
+ drm_crtc.o drm_fourcc.o drm_modes.o drm_edid.o drm_displayid.o \
drm_encoder_slave.o \
drm_trace_points.o drm_prime.o \
drm_rect.o drm_vma_manager.o drm_flip_work.o \
diff --git a/drivers/gpu/drm/drm_displayid.c b/drivers/gpu/drm/drm_displayid.c
new file mode 100644
index 000000000000..908bbe6feb61
--- /dev/null
+++ b/drivers/gpu/drm/drm_displayid.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include <drm/drm_displayid.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_print.h>
+
+static int validate_displayid(const u8 *displayid, int length, int idx)
+{
+ int i, dispid_length;
+ u8 csum = 0;
+ const struct displayid_hdr *base;
+
+ base = (const struct displayid_hdr *)&displayid[idx];
+
+ DRM_DEBUG_KMS("base revision 0x%x, length %d, %d %d\n",
+ base->rev, base->bytes, base->prod_id, base->ext_count);
+
+ /* +1 for DispID checksum */
+ dispid_length = sizeof(*base) + base->bytes + 1;
+ if (dispid_length > length - idx)
+ return -EINVAL;
+
+ for (i = 0; i < dispid_length; i++)
+ csum += displayid[idx + i];
+ if (csum) {
+ DRM_NOTE("DisplayID checksum invalid, remainder is %d\n", csum);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+const u8 *drm_find_displayid_extension(const struct edid *edid,
+ int *length, int *idx,
+ int *ext_index)
+{
+ const u8 *displayid = drm_find_edid_extension(edid, DISPLAYID_EXT, ext_index);
+ const struct displayid_hdr *base;
+ int ret;
+
+ if (!displayid)
+ return NULL;
+
+ /* EDID extensions block checksum isn't for us */
+ *length = EDID_LENGTH - 1;
+ *idx = 1;
+
+ ret = validate_displayid(displayid, *length, *idx);
+ if (ret)
+ return NULL;
+
+ base = (const struct displayid_hdr *)&displayid[*idx];
+ *length = *idx + sizeof(*base) + base->bytes;
+
+ return displayid;
+}
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index d510b827a1f8..58e61f792bc7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1585,8 +1585,6 @@ module_param_named(edid_fixup, edid_fixup, int, 0400);
MODULE_PARM_DESC(edid_fixup,
"Minimum number of valid EDID header bytes (0-8, default 6)");
-static int validate_displayid(const u8 *displayid, int length, int idx);
-
static int drm_edid_block_checksum(const u8 *raw_edid)
{
int i;
@@ -3241,8 +3239,8 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
/*
* Search EDID for CEA extension block.
*/
-static const u8 *drm_find_edid_extension(const struct edid *edid,
- int ext_id, int *ext_index)
+const u8 *drm_find_edid_extension(const struct edid *edid,
+ int ext_id, int *ext_index)
{
const u8 *edid_ext = NULL;
int i;
@@ -3266,32 +3264,6 @@ static const u8 *drm_find_edid_extension(const struct edid *edid,
return edid_ext;
}
-
-static const u8 *drm_find_displayid_extension(const struct edid *edid,
- int *length, int *idx,
- int *ext_index)
-{
- const u8 *displayid = drm_find_edid_extension(edid, DISPLAYID_EXT, ext_index);
- const struct displayid_hdr *base;
- int ret;
-
- if (!displayid)
- return NULL;
-
- /* EDID extensions block checksum isn't for us */
- *length = EDID_LENGTH - 1;
- *idx = 1;
-
- ret = validate_displayid(displayid, *length, *idx);
- if (ret)
- return NULL;
-
- base = (const struct displayid_hdr *)&displayid[*idx];
- *length = *idx + sizeof(*base) + base->bytes;
-
- return displayid;
-}
-
static const u8 *drm_find_cea_extension(const struct edid *edid)
{
int length, idx;
@@ -5287,32 +5259,6 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
return quirks;
}
-static int validate_displayid(const u8 *displayid, int length, int idx)
-{
- int i, dispid_length;
- u8 csum = 0;
- const struct displayid_hdr *base;
-
- base = (const struct displayid_hdr *)&displayid[idx];
-
- DRM_DEBUG_KMS("base revision 0x%x, length %d, %d %d\n",
- base->rev, base->bytes, base->prod_id, base->ext_count);
-
- /* +1 for DispID checksum */
- dispid_length = sizeof(*base) + base->bytes + 1;
- if (dispid_length > length - idx)
- return -EINVAL;
-
- for (i = 0; i < dispid_length; i++)
- csum += displayid[idx + i];
- if (csum) {
- DRM_NOTE("DisplayID checksum invalid, remainder is %d\n", csum);
- return -EINVAL;
- }
-
- return 0;
-}
-
static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *dev,
struct displayid_detailed_timings_1 *timings)
{
diff --git a/include/drm/drm_displayid.h b/include/drm/drm_displayid.h
index f141c0eff083..3c6db22a518a 100644
--- a/include/drm/drm_displayid.h
+++ b/include/drm/drm_displayid.h
@@ -22,6 +22,10 @@
#ifndef DRM_DISPLAYID_H
#define DRM_DISPLAYID_H
+#include <linux/types.h>
+
+struct edid;
+
#define DATA_BLOCK_PRODUCT_ID 0x00
#define DATA_BLOCK_DISPLAY_PARAMETERS 0x01
#define DATA_BLOCK_COLOR_CHARACTERISTICS 0x02
@@ -100,4 +104,8 @@ struct displayid_detailed_timing_block {
(idx) += sizeof(struct displayid_block) + (block)->num_bytes, \
(block) = (const struct displayid_block *)&(displayid)[idx])
+const u8 *drm_find_displayid_extension(const struct edid *edid,
+ int *length, int *idx,
+ int *ext_index);
+
#endif
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index a158f585f658..759328a5eeb2 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -543,5 +543,8 @@ struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
struct drm_display_mode *
drm_display_mode_from_cea_vic(struct drm_device *dev,
u8 video_code);
+const u8 *drm_find_edid_extension(const struct edid *edid,
+ int ext_id, int *ext_index);
+
#endif /* __DRM_EDID_H__ */
--
2.20.1
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