This is a note to let you know that I've just added the patch titled
can: m_can: pci: fix incorrect reference clock rate
to the 5.15-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-m_can-pci-fix-incorrect-reference-clock-rate.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8c03b8bff765ac4146342ef90931bb50e788c758 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
Date: Mon, 15 Nov 2021 10:18:49 +0100
Subject: can: m_can: pci: fix incorrect reference clock rate
From: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
commit 8c03b8bff765ac4146342ef90931bb50e788c758 upstream.
When testing the CAN controller on our Ekhart Lake hardware, we
determined that all communication was running with twice the configured
bitrate. Changing the reference clock rate from 100MHz to 200MHz fixed
this. Intel's support has confirmed to us that 200MHz is indeed the
correct clock rate.
Fixes: cab7ffc0324f ("can: m_can: add PCI glue driver for Intel Elkhart Lake")
Link: https://lore.kernel.org/all/c9cf3995f45c363e432b3ae8eb1275e54f009fc8.1636967198.git.matthias.schiffer@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matthias Schiffer <matthias.schiffer@xxxxxxxxxxxxxxx>
Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Reviewed-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/m_can/m_can_pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/can/m_can/m_can_pci.c
+++ b/drivers/net/can/m_can/m_can_pci.c
@@ -18,7 +18,7 @@
#define M_CAN_PCI_MMIO_BAR 0
-#define M_CAN_CLOCK_FREQ_EHL 100000000
+#define M_CAN_CLOCK_FREQ_EHL 200000000
#define CTL_CSR_INT_CTL_OFFSET 0x508
struct m_can_pci_priv {
Patches currently in stable-queue which might be from matthias.schiffer@xxxxxxxxxxxxxxx are
queue-5.15/can-m_can-pci-fix-incorrect-reference-clock-rate.patch
queue-5.15/can-m_can-pci-fix-iomap_read_fifo-and-iomap_write_fifo.patch
