Subject: [PATCH] Add quirk for the graphics adapter in some JSxx From: Tony Breeds References: 461002 - LTC50817 Patch-mainline: not yet These devices are set to 640x480 by firmware, switch them to 800x600@60. Signed-off-by: Tony Breeds Signed-off-by: Olaf Hering --- drivers/video/aty/radeon_monitor.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) --- a/drivers/video/aty/radeon_monitor.c +++ b/drivers/video/aty/radeon_monitor.c @@ -730,6 +730,25 @@ static void radeon_videomode_to_var(stru var->vmode = mode->vmode; } +#ifdef CONFIG_PPC_PSERIES +static int is_powerblade(const char *model) +{ + struct device_node *root; + const char* cp; + int len, l, rc = 0; + + root = of_find_node_by_path("/"); + if (root && model) { + l = strlen(model); + cp = of_get_property(root, "model", &len); + if (cp) + rc = memcmp(model, cp, min(len, l)) == 0; + of_node_put(root); + } + return rc; +} +#endif + /* * Build the modedb for head 1 (head 2 will come later), check panel infos * from either BIOS or EDID, and pick up the default mode @@ -865,6 +884,22 @@ void __devinit radeon_check_modes(struct has_default_mode = 1; } +#ifdef CONFIG_PPC_PSERIES + if (!has_default_mode && ( + is_powerblade("IBM,8842") || /* JS20 */ + is_powerblade("IBM,8844") || /* JS21 */ + is_powerblade("IBM,7998") || /* JS12/JS21/JS22 */ + is_powerblade("IBM,0792") || /* QS21 */ + is_powerblade("IBM,0793") /* QS22 */ + )) { + printk("Falling back to 800x600 on JSxx hardware\n"); + if (fb_find_mode(&info->var, info, "800x600@60", + info->monspecs.modedb, + info->monspecs.modedb_len, NULL, 8) != 0) + has_default_mode = 1; + } +#endif + /* * Still no mode, let's pick up a default from the db */