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>
This commit is contained in:
Anatolij Gustschin 2010-07-23 04:00:39 +00:00 committed by Grant Likely
parent a027b33348
commit 8b856f040c
3 changed files with 81 additions and 6 deletions

View File

@ -11,6 +11,11 @@ Required properties:
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
Optional properties:
- edid : verbatim EDID data block describing attached display.
Data from the detailed timing descriptor will be used to
program the display controller.
Example (MPC8610HPCD):
display@2c000 {
compatible = "fsl,diu";
@ -25,4 +30,5 @@ Example for MPC5121:
reg = <0x2100 0x100>;
interrupts = <64 0x8>;
interrupt-parent = <&ipic>;
edid = [edid-data];
};

View File

@ -1871,6 +1871,7 @@ config FB_MBX_DEBUG
config FB_FSL_DIU
tristate "Freescale DIU framebuffer support"
depends on FB && FSL_SOC
select FB_MODE_HELPERS
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT

View File

@ -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);