From 3af76454a70cd09d8e3ede94ee50a35c772ba439 Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Sat, 19 Jun 2010 13:54:48 +0200 Subject: [PATCH] drm/nouveau: Ignore broken legacy I2C entries. The nv05 card in the bug report [1] doesn't have usable I2C port register offsets (they're all filled with zeros). Ignore them and use the defaults. [1] http://bugs.launchpad.net/bugs/569505 Signed-off-by: Francisco Jerez Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_bios.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c index 9ab0c83fe9be..ed0f5303850d 100644 --- a/drivers/gpu/drm/nouveau/nouveau_bios.c +++ b/drivers/gpu/drm/nouveau/nouveau_bios.c @@ -5167,10 +5167,14 @@ static int parse_bmp_structure(struct drm_device *dev, struct nvbios *bios, unsi bios->legacy.i2c_indices.crt = bios->data[legacy_i2c_offset]; bios->legacy.i2c_indices.tv = bios->data[legacy_i2c_offset + 1]; bios->legacy.i2c_indices.panel = bios->data[legacy_i2c_offset + 2]; - bios->dcb.i2c[0].write = bios->data[legacy_i2c_offset + 4]; - bios->dcb.i2c[0].read = bios->data[legacy_i2c_offset + 5]; - bios->dcb.i2c[1].write = bios->data[legacy_i2c_offset + 6]; - bios->dcb.i2c[1].read = bios->data[legacy_i2c_offset + 7]; + if (bios->data[legacy_i2c_offset + 4]) + bios->dcb.i2c[0].write = bios->data[legacy_i2c_offset + 4]; + if (bios->data[legacy_i2c_offset + 5]) + bios->dcb.i2c[0].read = bios->data[legacy_i2c_offset + 5]; + if (bios->data[legacy_i2c_offset + 6]) + bios->dcb.i2c[1].write = bios->data[legacy_i2c_offset + 6]; + if (bios->data[legacy_i2c_offset + 7]) + bios->dcb.i2c[1].read = bios->data[legacy_i2c_offset + 7]; if (bmplength > 74) { bios->fmaxvco = ROM32(bmp[67]); -- 2.30.2