_DSM is added to program HPD_CTL(0x1094) register of PMC from i915 driver which will be called based on driver feature flag. PMC hpd control register programming will enable PMC to get hpd interrupt during dc9.
Signed-off-by: Animesh Manna <[email protected]> --- drivers/gpu/drm/i915/intel_acpi.c | 45 +++++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c index eb638a1..8f3d672 100644 --- a/drivers/gpu/drm/i915/intel_acpi.c +++ b/drivers/gpu/drm/i915/intel_acpi.c @@ -10,6 +10,8 @@ #define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */ #define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */ +#define INTEL_DSM_SET_HPD_WAKEUP 17 +#define HPD_WAKEUP_EN_VAL 0xFCF0 static struct intel_dsm_priv { acpi_handle dhandle; @@ -110,23 +112,52 @@ static void intel_dsm_platform_mux_info(void) ACPI_FREE(pkg); } +static void intel_dsm_set_hpd_wakeup(void) +{ + union acpi_object *obj; + union acpi_object argv4 = { + .integer.type = ACPI_TYPE_INTEGER, + .integer.value = HPD_WAKEUP_EN_VAL, + }; + + obj = acpi_evaluate_dsm_typed(intel_dsm_priv.dhandle, intel_dsm_guid, + INTEL_DSM_REVISION_ID, INTEL_DSM_SET_HPD_WAKEUP, + &argv4, ACPI_TYPE_INTEGER); + + if (!obj) + DRM_DEBUG_DRIVER("failed to evaluate _DSM\n"); + + ACPI_FREE(obj); +} + static bool intel_dsm_pci_probe(struct pci_dev *pdev) { acpi_handle dhandle; + struct drm_device *dev = pci_get_drvdata(pdev); + struct drm_i915_private *dev_priv = dev->dev_private; dhandle = ACPI_HANDLE(&pdev->dev); - if (!dhandle) - return false; - if (!acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, - 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) { - DRM_DEBUG_KMS("no _DSM method for intel device\n"); + if (!dhandle) return false; - } intel_dsm_priv.dhandle = dhandle; - intel_dsm_platform_mux_info(); + if (acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, + 1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) + intel_dsm_platform_mux_info(); + else + DRM_DEBUG_KMS("no _DSM method for mux-info\n"); + + /* Need to ensure vbt parsing is completed. */ + if (dev_priv->vbt.hpd_wakeup_enabled && + acpi_check_dsm(dhandle, intel_dsm_guid, INTEL_DSM_REVISION_ID, + 1 << INTEL_DSM_SET_HPD_WAKEUP)) + intel_dsm_set_hpd_wakeup(); + else { + dev_priv->vbt.hpd_wakeup_enabled = false; + DRM_DEBUG_KMS("no _DSM method for hpd-enabling\n"); + } return true; } -- 2.0.2 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
