drm: Export the command-line mode parser
In the absence of configuration data for providing the fixed mode for
a panel, I would like to be able to pass such modes along a separate
module paramenter. To do so, I then need to parse a modeline from a
string, which drm is already capable of. Export that capability to the
drivers.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 25bf873..207b7eb 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -974,3 +974,157 @@
}
}
EXPORT_SYMBOL(drm_mode_connector_list_update);
+
+/**
+ * drm_mode_parse_command_line_for_connector - parse command line for connector
+ * @mode_option - per connector mode option
+ * @connector - connector to parse line for
+ *
+ * This parses the connector specific then generic command lines for
+ * modes and options to configure the connector.
+ *
+ * This uses the same parameters as the fb modedb.c, except for extra
+ * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
+ *
+ * enable/enable Digital/disable bit at the end
+ */
+bool drm_mode_parse_command_line_for_connector(const char *mode_option,
+ struct drm_connector *connector,
+ struct drm_cmdline_mode *mode)
+{
+ const char *name;
+ unsigned int namelen;
+ int res_specified = 0, bpp_specified = 0, refresh_specified = 0;
+ unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
+ int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0;
+ int i;
+ enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
+
+ if (!mode_option)
+ mode_option = fb_mode_option;
+
+ if (!mode_option) {
+ mode->specified = false;
+ return false;
+ }
+
+ name = mode_option;
+ namelen = strlen(name);
+ for (i = namelen-1; i >= 0; i--) {
+ switch (name[i]) {
+ case '@':
+ namelen = i;
+ if (!refresh_specified && !bpp_specified &&
+ !yres_specified) {
+ refresh = simple_strtol(&name[i+1], NULL, 10);
+ refresh_specified = 1;
+ if (cvt || rb)
+ cvt = 0;
+ } else
+ goto done;
+ break;
+ case '-':
+ namelen = i;
+ if (!bpp_specified && !yres_specified) {
+ bpp = simple_strtol(&name[i+1], NULL, 10);
+ bpp_specified = 1;
+ if (cvt || rb)
+ cvt = 0;
+ } else
+ goto done;
+ break;
+ case 'x':
+ if (!yres_specified) {
+ yres = simple_strtol(&name[i+1], NULL, 10);
+ yres_specified = 1;
+ } else
+ goto done;
+ case '0' ... '9':
+ break;
+ case 'M':
+ if (!yres_specified)
+ cvt = 1;
+ break;
+ case 'R':
+ if (cvt)
+ rb = 1;
+ break;
+ case 'm':
+ if (!cvt)
+ margins = 1;
+ break;
+ case 'i':
+ if (!cvt)
+ interlace = 1;
+ break;
+ case 'e':
+ force = DRM_FORCE_ON;
+ break;
+ case 'D':
+ if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
+ (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
+ force = DRM_FORCE_ON;
+ else
+ force = DRM_FORCE_ON_DIGITAL;
+ break;
+ case 'd':
+ force = DRM_FORCE_OFF;
+ break;
+ default:
+ goto done;
+ }
+ }
+ if (i < 0 && yres_specified) {
+ xres = simple_strtol(name, NULL, 10);
+ res_specified = 1;
+ }
+done:
+ if (res_specified) {
+ mode->specified = true;
+ mode->xres = xres;
+ mode->yres = yres;
+ }
+
+ if (refresh_specified) {
+ mode->refresh_specified = true;
+ mode->refresh = refresh;
+ }
+
+ if (bpp_specified) {
+ mode->bpp_specified = true;
+ mode->bpp = bpp;
+ }
+ mode->rb = rb ? true : false;
+ mode->cvt = cvt ? true : false;
+ mode->interlace = interlace ? true : false;
+ mode->force = force;
+
+ return true;
+}
+EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
+
+struct drm_display_mode *
+drm_mode_create_from_cmdline_mode(struct drm_device *dev,
+ struct drm_cmdline_mode *cmd)
+{
+ struct drm_display_mode *mode;
+
+ if (cmd->cvt)
+ mode = drm_cvt_mode(dev,
+ cmd->xres, cmd->yres,
+ cmd->refresh_specified ? cmd->refresh : 60,
+ cmd->rb, cmd->interlace,
+ cmd->margins);
+ else
+ mode = drm_gtf_mode(dev,
+ cmd->xres, cmd->yres,
+ cmd->refresh_specified ? cmd->refresh : 60,
+ cmd->interlace,
+ cmd->margins);
+ if (!mode)
+ return NULL;
+
+ drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
+ return mode;
+}
+EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);