A default resolution of 1024x768 is used, if there are no
EDID data. However, this may not always be appropriate.
This patch introduces the kernel parameter drm.noedidres
that has the format "<width>x<height>". If specified, it will
override the default.
Example: drm.noedidres=1280x1024
Signed-off-by: Carsten Emde <c.e...@osadl.org>
---
drivers/gpu/drm/drm_crtc_helper.c | 14 +++++++++++++-
drivers/gpu/drm/drm_stub.c | 5 +++++
include/drm/drmP.h | 1 +
3 files changed, 19 insertions(+), 1 deletion(-)
Index: head/drivers/gpu/drm/drm_crtc_helper.c
===================================================================
--- head.orig/drivers/gpu/drm/drm_crtc_helper.c
+++ head/drivers/gpu/drm/drm_crtc_helper.c
@@ -110,9 +110,21 @@ int drm_helper_probe_single_connector_mo
count = (*connector_funcs->get_modes)(connector);
if (!count) {
- count = drm_add_modes_noedid(connector, 1024, 768);
+ unsigned long x = 1024, y = 768;
+
+ if (drm_noedidres != NULL) {
+ unsigned long nx, ny;
+
+ if (sscanf(drm_noedidres, "%lux%lu", &nx, &ny) == 2) {
+ x = nx;
+ y = ny;
+ }
+ }
+ count = drm_add_modes_noedid(connector, x, y);
if (!count)
return 0;
+ DRM_DEBUG_KMS("no EDID, added mode %lux%lu to connector %s\n",
+ x, y, drm_get_connector_name(connector));
}
drm_mode_connector_list_update(connector);
Index: head/drivers/gpu/drm/drm_stub.c
===================================================================
--- head.orig/drivers/gpu/drm/drm_stub.c
+++ head/drivers/gpu/drm/drm_stub.c
@@ -40,12 +40,17 @@
unsigned int drm_debug = 0; /* 1 to enable debug output */
EXPORT_SYMBOL(drm_debug);
+char *drm_noedidres; /* screen "<width>x<height>", if no EDID data */
+EXPORT_SYMBOL(drm_noedidres);
+
MODULE_AUTHOR(CORE_AUTHOR);
MODULE_DESCRIPTION(CORE_DESC);
MODULE_LICENSE("GPL and additional rights");
MODULE_PARM_DESC(debug, "Enable debug output");
+MODULE_PARM_DESC(noedidres, "Screen \"<width>x<height>\", if no EDID data");
module_param_named(debug, drm_debug, int, 0600);
+module_param_named(noedidres, drm_noedidres, charp, 0600);
struct idr drm_minors_idr;
Index: head/include/drm/drmP.h
===================================================================
--- head.orig/include/drm/drmP.h
+++ head/include/drm/drmP.h
@@ -1356,6 +1356,7 @@ extern int drm_get_dev(struct pci_dev *p
extern void drm_put_dev(struct drm_device *dev);
extern int drm_put_minor(struct drm_minor **minor);
extern unsigned int drm_debug;
+extern char *drm_noedidres;
extern struct class *drm_class;
extern struct proc_dir_entry *drm_proc_root;
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