diff mbox series

[v2] accel/ivpu: Remove D3hot delay for Meteorlake

Message ID 20230403121545.2995279-1-stanislaw.gruszka@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series [v2] accel/ivpu: Remove D3hot delay for Meteorlake | expand

Commit Message

Stanislaw Gruszka April 3, 2023, 12:15 p.m. UTC 
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 (PCIe
r6.0, sec 5.9.) .

The delay removal is traditionally done by adding PCI ID to
quirk_remove_d3hot_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_d3hot_delay()
for that.

Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
---
v2: improve commit log message

 drivers/accel/ivpu/ivpu_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Jeffrey Hugo April 4, 2023, 4:23 p.m. UTC | #1 
On 4/3/2023 6:15 AM, Stanislaw Gruszka wrote:
> 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 (PCIe
> r6.0, sec 5.9.) .
> 
> The delay removal is traditionally done by adding PCI ID to
> quirk_remove_d3hot_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_d3hot_delay()
> for that.
> 
> Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
diff mbox series

Patch

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);