On Sunday 14 November 2021 15:13:31 gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

Hello Greg! Following patch is needed for PCI_EXP_DEVCTL_PAYLOAD_512B macro: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

------------------ original commit in Linus's tree ------------------

From a4e17d65dafdd3513042d8f00404c9b6068a825c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= pali@kernel.org Date: Tue, 5 Oct 2021 20:09:41 +0200 Subject: [PATCH] PCI: aardvark: Fix PCIe Max Payload Size setting MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

Change PCIe Max Payload Size setting in PCIe Device Control register to 512 bytes to align with PCIe Link Initialization sequence as defined in Marvell Armada 3700 Functional Specification. According to the specification, maximal Max Payload Size supported by this device is 512 bytes.

Without this kernel prints suspicious line:

pci 0000:01:00.0: Upstream bridge's Max Payload Size set to 256 (was 16384, max 512)

With this change it changes to:

pci 0000:01:00.0: Upstream bridge's Max Payload Size set to 256 (was 512, max 512)

Link: https://lore.kernel.org/r/20211005180952.6812-3-kabel@kernel.org Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver") Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Marek Behún kabel@kernel.org Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Reviewed-by: Marek Behún kabel@kernel.org Cc: stable@vger.kernel.org

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 596ebcfcc82d..884510630bae 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -488,8 +488,9 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL); reg &= ~PCI_EXP_DEVCTL_RELAX_EN; reg &= ~PCI_EXP_DEVCTL_NOSNOOP_EN;

• reg &= ~PCI_EXP_DEVCTL_PAYLOAD; reg &= ~PCI_EXP_DEVCTL_READRQ;

• reg |= PCI_EXP_DEVCTL_PAYLOAD; /* Set max payload size */

• reg |= PCI_EXP_DEVCTL_PAYLOAD_512B; reg |= PCI_EXP_DEVCTL_READRQ_512B; advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL);