From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Airlie Subject: [PATCH 2/3] drm/pci: add support for getting the supported link bw. Date: Wed, 27 Jun 2012 08:35:53 +0100 Message-ID: <1340782554-9865-2-git-send-email-airlied@gmail.com> References: <1340782554-9865-1-git-send-email-airlied@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail07.svc.cra.dublin.eircom.net (mail07.svc.cra.dublin.eircom.net [159.134.118.23]) by gabe.freedesktop.org (Postfix) with SMTP id CAAB0A089E for ; Wed, 27 Jun 2012 00:40:42 -0700 (PDT) In-Reply-To: <1340782554-9865-1-git-send-email-airlied@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org From: Dave Airlie This should work for PCIE3.0 as well. Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drmP.h | 5 ++++ 2 files changed, 54 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c index 13f3d93..5320364 100644 --- a/drivers/gpu/drm/drm_pci.c +++ b/drivers/gpu/drm/drm_pci.c @@ -465,3 +465,52 @@ void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) DRM_INFO("Module unloaded\n"); } EXPORT_SYMBOL(drm_pci_exit); + +int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) +{ + struct pci_dev *root; + int pos; + u32 lnkcap, lnkcap2; + + *mask = 0; + if (!dev->pdev) + return -EINVAL; + + if (!pci_is_pcie(dev->pdev)) + return -EINVAL; + + root = dev->pdev->bus->self; + + pos = pci_pcie_cap(root); + if (!pos) + return -EINVAL; + + /* we've been informed via and serverworks don't make the cut */ + if (root->vendor == PCI_VENDOR_ID_VIA || + root->vendor == PCI_VENDOR_ID_SERVERWORKS) + return -EINVAL; + + pci_read_config_dword(root, pos + PCI_EXP_LNKCAP, &lnkcap); + pci_read_config_dword(root, pos + PCI_EXP_LNKCAP2, &lnkcap2); + + lnkcap &= PCI_EXP_LNKCAP_SLS; + lnkcap2 &= 0xfe; + + if (lnkcap2) { /* PCIE GEN 3.0 */ + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) + *mask |= DRM_PCIE_SPEED_25; + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) + *mask |= DRM_PCIE_SPEED_50; + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) + *mask |= DRM_PCIE_SPEED_80; + } else { + if (lnkcap & 1) + *mask |= DRM_PCIE_SPEED_25; + if (lnkcap & 2) + *mask |= DRM_PCIE_SPEED_50; + } + + DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); + return 0; +} +EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 31ad880..e4e3be3 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1761,6 +1761,11 @@ extern int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver); +#define DRM_PCIE_SPEED_25 1 +#define DRM_PCIE_SPEED_50 2 +#define DRM_PCIE_SPEED_80 4 + +extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask); /* platform section */ extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device); -- 1.7.7.6