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authorJani Nikula <jani.nikula@intel.com>2017-03-10 14:27:57 +0100
committerJani Nikula <jani.nikula@intel.com>2017-03-13 10:52:07 +0100
commit665788572c6410b7efadc2e3009c5d830b6d8ef9 (patch)
treee6f6bcc86c5f3d59331e7165d6ea21ba98f451bf /drivers/gpu/drm/i915/intel_bios.c
parentMerge tag 'topic/designware-baytrail-2017-03-02' of git://anongit.freedesktop... (diff)
downloadlinux-665788572c6410b7efadc2e3009c5d830b6d8ef9.tar.xz
linux-665788572c6410b7efadc2e3009c5d830b6d8ef9.zip
drm/i915/vbt: don't propagate errors from intel_bios_init()
We don't use the error return for anything other than reporting and logging that there is no VBT. We can pull the logging in the function, and remove the error status return. Moreover, if we needed the information for something later on, we'd probably be better off storing the bit in dev_priv, and using it where it's needed, instead of using the error return. While at it, improve the comments. Cc: Manasi Navare <manasi.d.navare@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/438ebbb0d5f0d321c625065b9cc78532a1dab24f.1489152288.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.c')
-rw-r--r--drivers/gpu/drm/i915/intel_bios.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index e144f033f4b5..710988d72253 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1462,36 +1462,35 @@ static const struct vbt_header *find_vbt(void __iomem *bios, size_t size)
* intel_bios_init - find VBT and initialize settings from the BIOS
* @dev_priv: i915 device instance
*
- * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
- * to appropriate values.
- *
- * Returns 0 on success, nonzero on failure.
+ * Parse and initialize settings from the Video BIOS Tables (VBT). If the VBT
+ * was not found in ACPI OpRegion, try to find it in PCI ROM first. Also
+ * initialize some defaults if the VBT is not present at all.
*/
-int
-intel_bios_init(struct drm_i915_private *dev_priv)
+void intel_bios_init(struct drm_i915_private *dev_priv)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
const struct vbt_header *vbt = dev_priv->opregion.vbt;
const struct bdb_header *bdb;
u8 __iomem *bios = NULL;
- if (HAS_PCH_NOP(dev_priv))
- return -ENODEV;
+ if (HAS_PCH_NOP(dev_priv)) {
+ DRM_DEBUG_KMS("Skipping VBT init due to disabled display.\n");
+ return;
+ }
init_vbt_defaults(dev_priv);
+ /* If the OpRegion does not have VBT, look in PCI ROM. */
if (!vbt) {
size_t size;
bios = pci_map_rom(pdev, &size);
if (!bios)
- return -1;
+ goto out;
vbt = find_vbt(bios, size);
- if (!vbt) {
- pci_unmap_rom(pdev, bios);
- return -1;
- }
+ if (!vbt)
+ goto out;
DRM_DEBUG_KMS("Found valid VBT in PCI ROM\n");
}
@@ -1516,10 +1515,12 @@ intel_bios_init(struct drm_i915_private *dev_priv)
parse_mipi_sequence(dev_priv, bdb);
parse_ddi_ports(dev_priv, bdb);
+out:
+ if (!vbt)
+ DRM_INFO("Failed to find VBIOS tables (VBT)\n");
+
if (bios)
pci_unmap_rom(pdev, bios);
-
- return 0;
}
/**