drm/kms: start adding command line interface using fb.

[note this requires an fb patch posted to linux-fbdev-devel already]

This uses the normal video= command line option to control the kms
output setup at boot time. It is used to override the autodetection
done by kms.

video= normally takes a framebuffer as the first parameter, in kms
it will take a connector name, DVI-I-1, or LVDS-1 etc. If no output
connector is specified the mode string will apply to all connectors.

The mode specification used will match down the probed modes, and if
no mode is found it will add a CVT mode that matches.

video=1024x768 - all connectors match a 1024x768 mode or add a CVT on
video=VGA-1:1024x768, VGA-1 connector gets mode only.

The same strings as used in current fb modedb.c are used, except I've
added three more letters, e, D, d, e = enable, D = enable Digital,
d = disable, which allow a connector to be forced into a certain state.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 223 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 2c4671314884..2537d2e81849 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -40,6 +40,196 @@ MODULE_LICENSE("GPL and additional rights");
 
 static LIST_HEAD(kernel_fb_helper_list);
 
+int drm_fb_helper_add_connector(struct drm_connector *connector)
+{
+        connector->fb_helper_private = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
+        if (!connector->fb_helper_private)
+                return -ENOMEM;
+
+        return 0;
+
+}
+EXPORT_SYMBOL(drm_fb_helper_add_connector);
+
+static int my_atoi(const char *name)
+{
+        int val = 0;
+
+        for (;; name++) {
+                switch (*name) {
+                case '0' ... '9':
+                        val = 10*val+(*name-'0');
+                        break;
+                default:
+                        return val;
+                }
+        }
+}
+
+/**
+ * drm_fb_helper_connector_parse_command_line - parse command line for connector
+ * @connector - connector to parse line for
+ * @mode_option - per connector mode option
+ *
+ * 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
+ */
+static bool drm_fb_helper_connector_parse_command_line(struct drm_connector *connector,
+                                                       const char *mode_option)
+{
+        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;
+        struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
+        struct drm_fb_helper_cmdline_mode *cmdline_mode = &fb_help_conn->cmdline_mode;
+
+        if (!mode_option)
+                mode_option = fb_mode_option;
+
+        if (!mode_option) {
+                cmdline_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 = my_atoi(&name[i+1]);
+                                refresh_specified = 1;
+                                if (cvt || rb)
+                                        cvt = 0;
+                        } else
+                                goto done;
+                        break;
+                case '-':
+                        namelen = i;
+                        if (!bpp_specified && !yres_specified) {
+                                bpp = my_atoi(&name[i+1]);
+                                bpp_specified = 1;
+                                if (cvt || rb)
+                                        cvt = 0;
+                        } else
+                                goto done;
+                        break;
+                case 'x':
+                        if (!yres_specified) {
+                                yres = my_atoi(&name[i+1]);
+                                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 = my_atoi(name);
+                res_specified = 1;
+        }
+done:
+
+        DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
+                drm_get_connector_name(connector), xres, yres,
+                (refresh) ? refresh : 60, (rb) ? " reduced blanking" :
+                "", (margins) ? " with margins" : "", (interlace) ?
+                " interlaced" : "");
+
+        if (force) {
+                const char *s;
+                switch (force) {
+                case DRM_FORCE_OFF: s = "OFF"; break;
+                case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
+                default:
+                case DRM_FORCE_ON: s = "ON"; break;
+                }
+
+                DRM_INFO("forcing %s connector %s\n",
+                         drm_get_connector_name(connector), s);
+                connector->force = force;
+        }
+
+        if (res_specified) {
+                cmdline_mode->specified = true;
+                cmdline_mode->xres = xres;
+                cmdline_mode->yres = yres;
+        }
+
+        if (refresh_specified) {
+                cmdline_mode->refresh_specified = true;
+                cmdline_mode->refresh = refresh;
+        }
+
+        if (bpp_specified) {
+                cmdline_mode->bpp_specified = true;
+                cmdline_mode->bpp = bpp;
+        }
+        cmdline_mode->rb = rb ? true : false;
+        cmdline_mode->cvt = cvt  ? true : false;
+        cmdline_mode->interlace = interlace ? true : false;
+
+        return true;
+}
+
+int drm_fb_helper_parse_command_line(struct drm_device *dev)
+{
+        struct drm_connector *connector;
+
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                char *option = NULL;
+
+                /* do something on return - turn off connector maybe */
+                if (fb_get_options(drm_get_connector_name(connector), &option))
+                        continue;
+
+                drm_fb_helper_connector_parse_command_line(connector, option);
+        }
+        return 0;
+}
+
 bool drm_fb_helper_force_kernel_mode(void)
 {
         int i = 0;
@@ -484,6 +674,8 @@ int drm_fb_helper_single_fb_probe(struct drm_device *dev,
                                                    uint32_t fb_height,
                                                    uint32_t surface_width,
                                                    uint32_t surface_height,
+                                                   uint32_t surface_depth,
+                                                   uint32_t surface_bpp,
                                                    struct drm_framebuffer **fb_ptr))
 {
         struct drm_crtc *crtc;
@@ -497,8 +689,37 @@ int drm_fb_helper_single_fb_probe(struct drm_device *dev,
         struct drm_framebuffer *fb;
         struct drm_mode_set *modeset = NULL;
         struct drm_fb_helper *fb_helper;
+        uint32_t surface_depth = 24, surface_bpp = 32;
 
         /* first up get a count of crtcs now in use and new min/maxes width/heights */
+        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+                struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
+                struct drm_fb_helper_cmdline_mode *cmdline_mode = &fb_help_conn->cmdline_mode;
+
+                if (cmdline_mode->bpp_specified) {
+                        switch (cmdline_mode->bpp) {
+                        case 8:
+                                surface_depth = surface_bpp = 8;
+                                break;
+                        case 15:
+                                surface_depth = 15;
+                                surface_bpp = 16;
+                                break;
+                        case 16:
+                                surface_depth = surface_bpp = 16;
+                                break;
+                        case 24:
+                                surface_depth = surface_bpp = 24;
+                                break;
+                        case 32:
+                                surface_depth = 24;
+                                surface_bpp = 32;
+                                break;
+                        }
+                        break;
+                }
+        }
+
         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                 if (drm_helper_crtc_in_use(crtc)) {
                         if (crtc->desired_mode) {
@@ -527,7 +748,8 @@ int drm_fb_helper_single_fb_probe(struct drm_device *dev,
         /* do we have an fb already? */
         if (list_empty(&dev->mode_config.fb_kernel_list)) {
                 ret = (*fb_create)(dev, fb_width, fb_height, surface_width,
-                                   surface_height, &fb);
+                                   surface_height, surface_depth, surface_bpp,
+                                   &fb);
                 if (ret)
                         return -EINVAL;
                 new_fb = 1;