powerpc/fsl-diu-fb: Support setting display mode using EDID

Adds support for encoding display mode information
in the device tree using verbatim EDID block.

If the EDID entry in the DIU node is present, the
driver will build mode database using EDID data
and allow setting the display modes from this database.
Otherwise display mode will be set using mode
entries from driver's internal database as usual.

This patch also updates device tree bindings.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 74 insertions, 6 deletions

diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index db3e360e6aad..e38ad2224540 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -35,6 +35,7 @@
 
 #include <sysdev/fsl_soc.h>
 #include <linux/fsl-diu-fb.h>
+#include "edid.h"
 
 /*
  * These parameters give default parameters
@@ -217,6 +218,7 @@ struct mfb_info {
         int x_aoi_d;            /* aoi display x offset to physical screen */
         int y_aoi_d;            /* aoi display y offset to physical screen */
         struct fsl_diu_data *parent;
+        u8 *edid_data;
 };
 
 
@@ -1185,18 +1187,30 @@ static int __devinit install_fb(struct fb_info *info)
         int rc;
         struct mfb_info *mfbi = info->par;
         const char *aoi_mode, *init_aoi_mode = "320x240";
+        struct fb_videomode *db = fsl_diu_mode_db;
+        unsigned int dbsize = ARRAY_SIZE(fsl_diu_mode_db);
+        int has_default_mode = 1;
 
         if (init_fbinfo(info))
                 return -EINVAL;
 
-        if (mfbi->index == 0)   /* plane 0 */
+        if (mfbi->index == 0) { /* plane 0 */
+                if (mfbi->edid_data) {
+                        /* Now build modedb from EDID */
+                        fb_edid_to_monspecs(mfbi->edid_data, &info->monspecs);
+                        fb_videomode_to_modelist(info->monspecs.modedb,
+                                                 info->monspecs.modedb_len,
+                                                 &info->modelist);
+                        db = info->monspecs.modedb;
+                        dbsize = info->monspecs.modedb_len;
+                }
                 aoi_mode = fb_mode;
-        else
+        } else {
                 aoi_mode = init_aoi_mode;
+        }
         pr_debug("mode used = %s\n", aoi_mode);
-        rc = fb_find_mode(&info->var, info, aoi_mode, fsl_diu_mode_db,
-             ARRAY_SIZE(fsl_diu_mode_db), &fsl_diu_default_mode, default_bpp);
-
+        rc = fb_find_mode(&info->var, info, aoi_mode, db, dbsize,
+                          &fsl_diu_default_mode, default_bpp);
         switch (rc) {
         case 1:
                 pr_debug("using mode specified in @mode\n");
@@ -1214,10 +1228,50 @@ static int __devinit install_fb(struct fb_info *info)
         default:
                 pr_debug("rc = %d\n", rc);
                 pr_debug("failed to find mode\n");
-                return -EINVAL;
+                /*
+                 * For plane 0 we continue and look into
+                 * driver's internal modedb.
+                 */
+                if (mfbi->index == 0 && mfbi->edid_data)
+                        has_default_mode = 0;
+                else
+                        return -EINVAL;
                 break;
         }
 
+        if (!has_default_mode) {
+                rc = fb_find_mode(&info->var, info, aoi_mode, fsl_diu_mode_db,
+                                  ARRAY_SIZE(fsl_diu_mode_db),
+                                  &fsl_diu_default_mode,
+                                  default_bpp);
+                if (rc > 0 && rc < 5)
+                        has_default_mode = 1;
+        }
+
+        /* Still not found, use preferred mode from database if any */
+        if (!has_default_mode && info->monspecs.modedb) {
+                struct fb_monspecs *specs = &info->monspecs;
+                struct fb_videomode *modedb = &specs->modedb[0];
+
+                /*
+                 * Get preferred timing. If not found,
+                 * first mode in database will be used.
+                 */
+                if (specs->misc & FB_MISC_1ST_DETAIL) {
+                        int i;
+
+                        for (i = 0; i < specs->modedb_len; i++) {
+                                if (specs->modedb[i].flag & FB_MODE_IS_FIRST) {
+                                        modedb = &specs->modedb[i];
+                                        break;
+                                }
+                        }
+                }
+
+                info->var.bits_per_pixel = default_bpp;
+                fb_videomode_to_var(&info->var, modedb);
+        }
+
         pr_debug("xres_virtual %d\n", info->var.xres_virtual);
         pr_debug("bits_per_pixel %d\n", info->var.bits_per_pixel);
 
@@ -1256,6 +1310,9 @@ static void uninstall_fb(struct fb_info *info)
         if (!mfbi->registered)
                 return;
 
+        if (mfbi->index == 0)
+                kfree(mfbi->edid_data);
+
         unregister_framebuffer(info);
         unmap_video_memory(info);
         if (&info->cmap)
@@ -1456,6 +1513,17 @@ static int __devinit fsl_diu_probe(struct of_device *ofdev,
                 mfbi = machine_data->fsl_diu_info[i]->par;
                 memcpy(mfbi, &mfb_template[i], sizeof(struct mfb_info));
                 mfbi->parent = machine_data;
+
+                if (mfbi->index == 0) {
+                        const u8 *prop;
+                        int len;
+
+                        /* Get EDID */
+                        prop = of_get_property(np, "edid", &len);
+                        if (prop && len == EDID_LENGTH)
+                                mfbi->edid_data = kmemdup(prop, EDID_LENGTH,
+                                                          GFP_KERNEL);
+                }
         }
 
         ret = of_address_to_resource(np, 0, &res);