From: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> To: dri-devel@lists.freedesktop.org Cc: Oded Gabbay <ogabbay@kernel.org>, Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>, Jeffrey Hugo <quic_jhugo@quicinc.com>, linux-pci@vger.kernel.org, Karol Wachowski <karol.wachowski@linux.intel.com>, Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> Subject: [PATCH] accel/ivpu: Remove D3hot delay for Meteorlake Date: Fri, 31 Mar 2023 13:40:27 +0200 [thread overview] Message-ID: <20230331114027.2803100-1-stanislaw.gruszka@linux.intel.com> (raw) From: Karol Wachowski <karol.wachowski@linux.intel.com> VPU on MTL has hardware optimizations and does not require 10ms D0 - D3hot transition delay imposed by PCI specification. The delay removal is traditionally done by adding PCI ID to quirk_remove_dhot_delay() in drivers/pci/quirks.c . But since we do not need that optimization before driver probe and we can better specify in the ivpu driver on what (future) hardware use the optimization, we do not use quirk_remove_dhot_delay() for that. Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> --- drivers/accel/ivpu/ivpu_drv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c index 3be4a5a2b07a..cf9925c0a8ad 100644 --- a/drivers/accel/ivpu/ivpu_drv.c +++ b/drivers/accel/ivpu/ivpu_drv.c @@ -442,6 +442,10 @@ static int ivpu_pci_init(struct ivpu_device *vdev) /* Clear any pending errors */ pcie_capability_clear_word(pdev, PCI_EXP_DEVSTA, 0x3f); + /* VPU MTL does not require PCI spec 10m D3hot delay */ + if (ivpu_is_mtl(vdev)) + pdev->d3hot_delay = 0; + ret = pcim_enable_device(pdev); if (ret) { ivpu_err(vdev, "Failed to enable PCI device: %d\n", ret); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> To: dri-devel@lists.freedesktop.org Cc: Jeffrey Hugo <quic_jhugo@quicinc.com>, Karol Wachowski <karol.wachowski@linux.intel.com>, linux-pci@vger.kernel.org, Oded Gabbay <ogabbay@kernel.org>, Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>, Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com> Subject: [PATCH] accel/ivpu: Remove D3hot delay for Meteorlake Date: Fri, 31 Mar 2023 13:40:27 +0200 [thread overview] Message-ID: <20230331114027.2803100-1-stanislaw.gruszka@linux.intel.com> (raw) From: Karol Wachowski <karol.wachowski@linux.intel.com> VPU on MTL has hardware optimizations and does not require 10ms D0 - D3hot transition delay imposed by PCI specification. The delay removal is traditionally done by adding PCI ID to quirk_remove_dhot_delay() in drivers/pci/quirks.c . But since we do not need that optimization before driver probe and we can better specify in the ivpu driver on what (future) hardware use the optimization, we do not use quirk_remove_dhot_delay() for that. Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> --- drivers/accel/ivpu/ivpu_drv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c index 3be4a5a2b07a..cf9925c0a8ad 100644 --- a/drivers/accel/ivpu/ivpu_drv.c +++ b/drivers/accel/ivpu/ivpu_drv.c @@ -442,6 +442,10 @@ static int ivpu_pci_init(struct ivpu_device *vdev) /* Clear any pending errors */ pcie_capability_clear_word(pdev, PCI_EXP_DEVSTA, 0x3f); + /* VPU MTL does not require PCI spec 10m D3hot delay */ + if (ivpu_is_mtl(vdev)) + pdev->d3hot_delay = 0; + ret = pcim_enable_device(pdev); if (ret) { ivpu_err(vdev, "Failed to enable PCI device: %d\n", ret); -- 2.25.1
next reply other threads:[~2023-03-31 11:41 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-31 11:40 Stanislaw Gruszka [this message] 2023-03-31 11:40 ` [PATCH] accel/ivpu: Remove D3hot delay for Meteorlake Stanislaw Gruszka 2023-03-31 19:26 ` Bjorn Helgaas 2023-03-31 19:26 ` Bjorn Helgaas 2023-04-03 12:10 ` Stanislaw Gruszka
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