5.10-stable patches

added patches:
	pci-aardvark-increase-polling-delay-to-1.5s-while-waiting-for-pio-response.patch

diff --git a/queue-5.10/pci-aardvark-increase-polling-delay-to-1.5s-while-waiting-for-pio-response.patch b/queue-5.10/pci-aardvark-increase-polling-delay-to-1.5s-while-waiting-for-pio-response.patch
new file mode 100644 (file)
index 0000000..1e317bb
--- /dev/null
+++ b/queue-5.10/pci-aardvark-increase-polling-delay-to-1.5s-while-waiting-for-pio-response.patch
@@ -0,0 +1,56 @@
+From 2b58db229eb617d97d5746113b77045f1f884bcb Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 22 Jul 2021 16:40:39 +0200
+Subject: PCI: aardvark: Increase polling delay to 1.5s while waiting for PIO response
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Pali Rohár <pali@kernel.org>
+
+commit 2b58db229eb617d97d5746113b77045f1f884bcb upstream.
+
+Measurements in different conditions showed that aardvark hardware PIO
+response can take up to 1.44s. Increase wait timeout from 1ms to 1.5s to
+ensure that we do not miss responses from hardware. After 1.44s hardware
+returns errors (e.g. Completer abort).
+
+The previous two patches fixed checking for PIO status, so now we can use
+it to also catch errors which are reported by hardware after 1.44s.
+
+After applying this patch, kernel can detect and print PIO errors to dmesg:
+
+    [    6.879999] advk-pcie d0070000.pcie: Non-posted PIO Response Status: CA, 0xe00 @ 0x100004
+    [    6.896436] advk-pcie d0070000.pcie: Posted PIO Response Status: COMP_ERR, 0x804 @ 0x100004
+    [    6.913049] advk-pcie d0070000.pcie: Posted PIO Response Status: COMP_ERR, 0x804 @ 0x100010
+    [    6.929663] advk-pcie d0070000.pcie: Non-posted PIO Response Status: CA, 0xe00 @ 0x100010
+    [    6.953558] advk-pcie d0070000.pcie: Posted PIO Response Status: COMP_ERR, 0x804 @ 0x100014
+    [    6.970170] advk-pcie d0070000.pcie: Non-posted PIO Response Status: CA, 0xe00 @ 0x100014
+    [    6.994328] advk-pcie d0070000.pcie: Posted PIO Response Status: COMP_ERR, 0x804 @ 0x100004
+
+Without this patch kernel prints only a generic error to dmesg:
+
+    [    5.246847] advk-pcie d0070000.pcie: config read/write timed out
+
+Link: https://lore.kernel.org/r/20210722144041.12661-3-pali@kernel.org
+Signed-off-by: Pali Rohár <pali@kernel.org>
+Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+Reviewed-by: Marek Behún <kabel@kernel.org>
+Cc: stable@vger.kernel.org # 7fbcb5da811b ("PCI: aardvark: Don't rely on jiffies while holding spinlock")
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/pci/controller/pci-aardvark.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/pci/controller/pci-aardvark.c
++++ b/drivers/pci/controller/pci-aardvark.c
+@@ -214,7 +214,7 @@
+       (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn))    | \
+        PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
+ 
+-#define PIO_RETRY_CNT                 500
++#define PIO_RETRY_CNT                 750000 /* 1.5 s */
+ #define PIO_RETRY_DELAY                       2 /* 2 us*/
+ 
+ #define LINK_WAIT_MAX_RETRIES         10

diff --git a/queue-5.10/series b/queue-5.10/series
new file mode 100644 (file)
index 0000000..9aa5841
--- /dev/null
+++ b/queue-5.10/series
@@ -0,0 +1 @@
+pci-aardvark-increase-polling-delay-to-1.5s-while-waiting-for-pio-response.patch