This is a note to let you know that I've just added the patch titled
can: ifi: Check core revision upon probe
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-ifi-check-core-revision-upon-probe.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 591d65d5b15496af8d05e252bc1da611c66c0b79 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@xxxxxxx>
Date: Mon, 5 Mar 2018 21:29:52 +0100
Subject: can: ifi: Check core revision upon probe
From: Marek Vasut <marex@xxxxxxx>
commit 591d65d5b15496af8d05e252bc1da611c66c0b79 upstream.
Older versions of the core are not compatible with the driver due
to various intrusive fixes of the core. Read out the VER register,
check the core revision bitfield and verify if the core in use is
new enough (rev 2.1 or newer) to work correctly with this driver.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Heiko Schocher <hs@xxxxxxx>
Cc: Markus Marb <markus@xxxxxxxx>
Cc: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/ifi_canfd/ifi_canfd.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -144,6 +144,8 @@
#define IFI_CANFD_SYSCLOCK 0x50
#define IFI_CANFD_VER 0x54
+#define IFI_CANFD_VER_REV_MASK 0xff
+#define IFI_CANFD_VER_REV_MIN_SUPPORTED 0x15
#define IFI_CANFD_IP_ID 0x58
#define IFI_CANFD_IP_ID_VALUE 0xD073CAFD
@@ -943,7 +945,7 @@ static int ifi_canfd_plat_probe(struct p
struct resource *res;
void __iomem *addr;
int irq, ret;
- u32 id;
+ u32 id, rev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
addr = devm_ioremap_resource(dev, res);
@@ -957,6 +959,13 @@ static int ifi_canfd_plat_probe(struct p
return -EINVAL;
}
+ rev = readl(addr + IFI_CANFD_VER) & IFI_CANFD_VER_REV_MASK;
+ if (rev < IFI_CANFD_VER_REV_MIN_SUPPORTED) {
+ dev_err(dev, "This block is too old (rev %i), minimum supported is rev %i\n",
+ rev, IFI_CANFD_VER_REV_MIN_SUPPORTED);
+ return -EINVAL;
+ }
+
ndev = alloc_candev(sizeof(*priv), 1);
if (!ndev)
return -ENOMEM;
Patches currently in stable-queue which might be from marex@xxxxxxx are
queue-4.9/can-ifi-check-core-revision-upon-probe.patch
queue-4.9/can-ifi-repair-the-error-handling.patch