On Tue, Mar 26, 2019 at 10:17:44AM +0100, Thomas Zimmermann wrote:
Mode detection currently reports the modes listed in fb_info::modelist. The list is either build from EDID information or, more often, a list of previously set modes. A later update to the mode detection could also take into account the modes in fb_monspecs::modedb or test pre-defined VESA modes.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de
drivers/gpu/drm/fbdevdrm/fbdevdrm_modeset.c | 163 +++++++++++++++++++- 1 file changed, 162 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/fbdevdrm/fbdevdrm_modeset.c b/drivers/gpu/drm/fbdevdrm/fbdevdrm_modeset.c index 87f56ec76edf..e89eca4b58df 100644 --- a/drivers/gpu/drm/fbdevdrm/fbdevdrm_modeset.c +++ b/drivers/gpu/drm/fbdevdrm/fbdevdrm_modeset.c @@ -21,9 +21,16 @@ #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> #include <linux/fb.h> +#include "fbdevdrm_device.h" #include "fbdevdrm_modes.h" #include "fbdevdrm_primary.h"
+static struct fbdevdrm_modeset* fbdevdrm_modeset_of_connector(
- struct drm_connector *connector)
+{
- return container_of(connector, struct fbdevdrm_modeset, connector);
+}
static struct fbdevdrm_modeset* fbdevdrm_modeset_of_crtc( struct drm_crtc *crtc) { @@ -353,11 +360,130 @@ static const struct drm_encoder_funcs fbdevdrm_encoder_funcs = {
- Connector
*/
-static int connector_helper_get_modes(struct drm_connector *connector) +static int update_display_info(struct drm_display_info *info, struct fb_info *fb_info) +{
- int num_pixel;
- if (fb_info->fix.type != FB_TYPE_PACKED_PIXELS)
return -EINVAL; /* rule out text mode, etc. */- if (fb_info->fix.id[0]) {
strncpy(info->name, fb_info->fix.id, sizeof(info->name) - 1);info->name[sizeof(info->name) - 1] = '\0';- } else {
memset(info->name, '\0', sizeof(info->name));- }
- info->width_mm = fb_info->var.width;
- info->height_mm = fb_info->var.height;
- info->pixel_clock = PICOS2KHZ(fb_info->var.pixclock);
- num_pixel = 0;
- if (fb_info->var.red.length)
++num_pixel;- if (fb_info->var.green.length)
++num_pixel;- if (fb_info->var.blue.length)
++num_pixel;- if (fb_info->var.transp.length)
++num_pixel;- if (num_pixel)
info->bpc = fb_info->var.bits_per_pixel;- else
info->bpc = 0;- info->subpixel_order = SubPixelUnknown;
- info->color_formats = DRM_COLOR_FORMAT_RGB444;
- info->bus_formats = &info->color_formats;
- info->num_bus_formats = 1;
- info->bus_flags = 0;
- info->max_tmds_clock = 0;
- info->dvi_dual = false;
- info->has_hdmi_infoframe = false;
- info->edid_hdmi_dc_modes = 0;
- info->cea_rev = 0;
- memset(&info->hdmi, 0, sizeof(info->hdmi));
- info->non_desktop = 0;
I think the only things here you may want to set are width_mm and height_mm. The rest should not matter.
- return 0;
+}
+static int drm_mode_probed_add_from_fb_videomode(
- struct drm_connector *connector, const struct fb_videomode *fb_mode,
- struct fb_info *fb_info)
{
- struct drm_display_mode *mode;
- mode = drm_mode_create_from_fb_videomode(connector->dev, fb_mode);
- if (!mode)
return -ENOMEM;- mode->width_mm = fb_info->var.width;
- mode->height_mm = fb_info->var.height;
- drm_mode_probed_add(connector, mode);
- /* update connector properties from display mode */
- if (mode->flags & DRM_MODE_FLAG_INTERLACE)
connector->interlace_allowed = true;- if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
connector->doublescan_allowed = true;- if (mode->flags & DRM_MODE_FLAG_3D_MASK)
connector->stereo_allowed = true;- return 0;
}
+static int connector_helper_get_modes(struct drm_connector *connector) +{
- struct fbdevdrm_modeset *modeset;
- struct list_head *pos;
- int ret, num_modes = 0;
- modeset = fbdevdrm_modeset_of_connector(connector);
- ret = update_display_info(&connector->display_info, modeset->fb_info);
- if (ret)
return 0;- /* update connector properties from video modes */
- connector->interlace_allowed = 0;
- connector->doublescan_allowed = 0;
- connector->stereo_allowed = 0;
- if (!num_modes && modeset->fb_info->mode) {
ret = drm_mode_probed_add_from_fb_videomode(connector, modeset->fb_info->mode, modeset->fb_info);if (!ret)++num_modes;- }
- if (!num_modes) {
/* DRM backporting notes: we go through all modes in the* fb_info's mode list and convert each to a DRM modes. If* you convert an fbdev driver to DRM, replace this code* with an actual hardware query. This will usually involve* reading the monitor EDID via DDC.*/list_for_each(pos, &modeset->fb_info->modelist) {
fbdev has a modelist? I guess it does. But not exposed to userspace, which is probably the reason I never realized this.