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authorAlex Deucher <alexdeucher@gmail.com>2010-04-06 12:35:26 -0400
committerDave Airlie <airlied@redhat.com>2010-04-07 10:13:18 +1000
commit3a89b4a9ca7ce11e3b7d5119aea917b9fc29a302 (patch)
tree5ddfb6321e7d0e8433afe29819c16f182b4e4c43 /drivers/gpu
parentaffd858907aae7bf7d7d7fa02ff19f35de2ff1d8 (diff)
drm/radeon/kms/combios: verify dac_adj values are valid
Some vbios dac_adj tables are all zeros. Check for that case and use the default table if so. Should fix fdo bug 27478. Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: stable <stable@kernel.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/radeon/radeon_combios.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 2becdeda68a3..37db8adb2748 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -760,7 +760,9 @@ struct radeon_encoder_primary_dac *radeon_combios_get_primary_dac_info(struct
dac = RBIOS8(dac_info + 0x3) & 0xf;
p_dac->ps2_pdac_adj = (bg << 8) | (dac);
}
- found = 1;
+ /* if the values are all zeros, use the table */
+ if (p_dac->ps2_pdac_adj)
+ found = 1;
}
if (!found) /* fallback to defaults */
@@ -895,7 +897,9 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct
bg = RBIOS8(dac_info + 0x10) & 0xf;
dac = RBIOS8(dac_info + 0x11) & 0xf;
tv_dac->ntsc_tvdac_adj = (bg << 16) | (dac << 20);
- found = 1;
+ /* if the values are all zeros, use the table */
+ if (tv_dac->ps2_tvdac_adj)
+ found = 1;
} else if (rev > 1) {
bg = RBIOS8(dac_info + 0xc) & 0xf;
dac = (RBIOS8(dac_info + 0xc) >> 4) & 0xf;
@@ -908,7 +912,9 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct
bg = RBIOS8(dac_info + 0xe) & 0xf;
dac = (RBIOS8(dac_info + 0xe) >> 4) & 0xf;
tv_dac->ntsc_tvdac_adj = (bg << 16) | (dac << 20);
- found = 1;
+ /* if the values are all zeros, use the table */
+ if (tv_dac->ps2_tvdac_adj)
+ found = 1;
}
tv_dac->tv_std = radeon_combios_get_tv_info(rdev);
}
@@ -925,7 +931,9 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct
(bg << 16) | (dac << 20);
tv_dac->pal_tvdac_adj = tv_dac->ps2_tvdac_adj;
tv_dac->ntsc_tvdac_adj = tv_dac->ps2_tvdac_adj;
- found = 1;
+ /* if the values are all zeros, use the table */
+ if (tv_dac->ps2_tvdac_adj)
+ found = 1;
} else {
bg = RBIOS8(dac_info + 0x4) & 0xf;
dac = RBIOS8(dac_info + 0x5) & 0xf;
@@ -933,7 +941,9 @@ struct radeon_encoder_tv_dac *radeon_combios_get_tv_dac_info(struct
(bg << 16) | (dac << 20);
tv_dac->pal_tvdac_adj = tv_dac->ps2_tvdac_adj;
tv_dac->ntsc_tvdac_adj = tv_dac->ps2_tvdac_adj;
- found = 1;
+ /* if the values are all zeros, use the table */
+ if (tv_dac->ps2_tvdac_adj)
+ found = 1;
}
} else {
DRM_INFO("No TV DAC info found in BIOS\n");