On Mon, 08 Feb 2016, "Thulasimani, Sivakumar" <[email protected]>
wrote:
> On 2/5/2016 4:06 PM, Jani Nikula wrote:
>> Hide knowledge about VBT child devices in intel_bios.c.
>>
>> Signed-off-by: Jani Nikula <[email protected]>
>> ---
>> drivers/gpu/drm/i915/i915_drv.h | 1 +
>> drivers/gpu/drm/i915/intel_bios.c | 50 ++++++++++++++++++++++++++++++++++++
>> drivers/gpu/drm/i915/intel_lvds.c | 53
>> +--------------------------------------
>> 3 files changed, 52 insertions(+), 52 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h
>> b/drivers/gpu/drm/i915/i915_drv.h
>> index 715f200cfbf5..d70ef71d2538 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -3398,6 +3398,7 @@ extern void intel_i2c_reset(struct drm_device *dev);
>> int intel_bios_init(struct drm_i915_private *dev_priv);
>> bool intel_bios_is_valid_vbt(const void *buf, size_t size);
>> bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
>> +bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8
>> *i2c_pin);
>>
>> /* intel_opregion.c */
>> #ifdef CONFIG_ACPI
>> diff --git a/drivers/gpu/drm/i915/intel_bios.c
>> b/drivers/gpu/drm/i915/intel_bios.c
>> index 2800ae50465a..f3f4f8e687cf 100644
>> --- a/drivers/gpu/drm/i915/intel_bios.c
>> +++ b/drivers/gpu/drm/i915/intel_bios.c
>> @@ -1469,3 +1469,53 @@ bool intel_bios_is_tv_present(struct drm_i915_private
>> *dev_priv)
>>
>> return false;
>> }
>> +
>> +/**
>> + * intel_bios_is_lvds_present - is LVDS present in VBT
>> + * @dev_priv: i915 device instance
>> + * @i2c_pin: i2c pin for LVDS if present
>> + *
>> + * Return true if LVDS is present. If no child devices were parsed from VBT,
>> + * assume LVDS is present.
>> + */
>> +bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8
>> *i2c_pin)
>> +{
>> + int i;
>> +
>> + if (!dev_priv->vbt.child_dev_num)
>> + return true;
>> +
> we check if eDP is supported through following code before the call to
> this function. please add this check here so we can avoid vbt
> referencing for that.
Unfortunately, that would change the logic and I want to avoid making
that change at this point. For PCH split, we respect
dev_priv->vbt.edp_support, and bail out early, but otherwise we ignore
VBT if the BIOS has enabled LVDS anyway. I can only guess it's some
hackery to work around some weird setups out there.
BR,
Jani.
>
> intel_lvds.c
> 972 if (HAS_PCH_SPLIT(dev)) {
> 973 if ((lvds & LVDS_DETECTED) == 0)
> 974 return;
> 975 if (dev_priv->vbt.edp_support) {
> 976 DRM_DEBUG_KMS("disable LVDS for eDP
> support\n");
> 977 return;
> 978 }
> 979 }
>
> Sivakumar
>> + for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
>> + union child_device_config *uchild = dev_priv->vbt.child_dev + i;
>> + struct old_child_dev_config *child = &uchild->old;
>> +
>> + /* If the device type is not LFP, continue.
>> + * We have to check both the new identifiers as well as the
>> + * old for compatibility with some BIOSes.
>> + */
>> + if (child->device_type != DEVICE_TYPE_INT_LFP &&
>> + child->device_type != DEVICE_TYPE_LFP)
>> + continue;
>> +
>> + if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
>> + *i2c_pin = child->i2c_pin;
>> +
>> + /* However, we cannot trust the BIOS writers to populate
>> + * the VBT correctly. Since LVDS requires additional
>> + * information from AIM blocks, a non-zero addin offset is
>> + * a good indicator that the LVDS is actually present.
>> + */
>> + if (child->addin_offset)
>> + return true;
>> +
>> + /* But even then some BIOS writers perform some black magic
>> + * and instantiate the device without reference to any
>> + * additional data. Trust that if the VBT was written into
>> + * the OpRegion then they have validated the LVDS's existence.
>> + */
>> + if (dev_priv->opregion.vbt)
>> + return true;
>> + }
>> +
>> + return false;
>> +}
>> diff --git a/drivers/gpu/drm/i915/intel_lvds.c
>> b/drivers/gpu/drm/i915/intel_lvds.c
>> index 0da0240caf81..80f8684e5137 100644
>> --- a/drivers/gpu/drm/i915/intel_lvds.c
>> +++ b/drivers/gpu/drm/i915/intel_lvds.c
>> @@ -772,57 +772,6 @@ static const struct dmi_system_id intel_no_lvds[] = {
>> { } /* terminating entry */
>> };
>>
>> -/*
>> - * Enumerate the child dev array parsed from VBT to check whether
>> - * the LVDS is present.
>> - * If it is present, return 1.
>> - * If it is not present, return false.
>> - * If no child dev is parsed from VBT, it assumes that the LVDS is present.
>> - */
>> -static bool lvds_is_present_in_vbt(struct drm_device *dev,
>> - u8 *i2c_pin)
>> -{
>> - struct drm_i915_private *dev_priv = dev->dev_private;
>> - int i;
>> -
>> - if (!dev_priv->vbt.child_dev_num)
>> - return true;
>> -
>> - for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
>> - union child_device_config *uchild = dev_priv->vbt.child_dev + i;
>> - struct old_child_dev_config *child = &uchild->old;
>> -
>> - /* If the device type is not LFP, continue.
>> - * We have to check both the new identifiers as well as the
>> - * old for compatibility with some BIOSes.
>> - */
>> - if (child->device_type != DEVICE_TYPE_INT_LFP &&
>> - child->device_type != DEVICE_TYPE_LFP)
>> - continue;
>> -
>> - if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
>> - *i2c_pin = child->i2c_pin;
>> -
>> - /* However, we cannot trust the BIOS writers to populate
>> - * the VBT correctly. Since LVDS requires additional
>> - * information from AIM blocks, a non-zero addin offset is
>> - * a good indicator that the LVDS is actually present.
>> - */
>> - if (child->addin_offset)
>> - return true;
>> -
>> - /* But even then some BIOS writers perform some black magic
>> - * and instantiate the device without reference to any
>> - * additional data. Trust that if the VBT was written into
>> - * the OpRegion then they have validated the LVDS's existence.
>> - */
>> - if (dev_priv->opregion.vbt)
>> - return true;
>> - }
>> -
>> - return false;
>> -}
>> -
>> static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
>> {
>> DRM_INFO("Forcing lvds to dual link mode on %s\n", id->ident);
>> @@ -979,7 +928,7 @@ void intel_lvds_init(struct drm_device *dev)
>> }
>>
>> pin = GMBUS_PIN_PANEL;
>> - if (!lvds_is_present_in_vbt(dev, &pin)) {
>> + if (!intel_bios_is_lvds_present(dev_priv, &pin)) {
>> if ((lvds & LVDS_PORT_EN) == 0) {
>> DRM_DEBUG_KMS("LVDS is not present in VBT\n");
>> return;
>
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--
Jani Nikula, Intel Open Source Technology Center
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