Revert "can: m_can: pci: use custom bit timings for Elkhart Lake"

This reverts commit 09840e7a50161022394d6f0ca1b4053bf8baa269.

Commit 09840e7a5016 ("can: m_can: pci: use custom bit timings for
Elkhart Lake") broke the test case using bitrate switching.

| ip link set can0 up type can bitrate 500000 dbitrate 4000000 fd on
| ip link set can1 up type can bitrate 500000 dbitrate 4000000 fd on
| candump can0 &
| cangen can1 -I 0x800 -L 64 -e -fb \
|     -D 11223344deadbeef55667788feedf00daabbccdd44332211 -n 1 -v -v

Above commit does everything correctly according to the datasheet.
However datasheet wasn't correct.

I got confirmation from hardware engineers that the actual CAN
hardware on Intel Elkhart Lake is based on M_CAN version v3.2.0.
Datasheet was mirroring values from an another specification which was
based on earlier M_CAN version leading to wrong bit timings.

Therefore revert the commit and switch back to common bit timings.

Fixes: d5609725ba23 ("can: m_can: pci: use custom bit timings for Elkhart Lake")
Link: https://lore.kernel.org/all/20220512124144.536850-1-jarkko.nikula@linux.intel.com
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reported-by: Chee Hou Ong <chee.houx.ong@intel.com>
Reported-by: Aman Kumar <aman.kumar@intel.com>
Reported-by: Pallavi Kumari <kumari.pallavi@intel.com>
Cc: <stable@vger.kernel.org> # v5.16+
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/m_can/m_can_pci.c b/drivers/net/can/m_can/m_can_pci.c
index b56a54d6c5a9c4d274ecc76b637fbaa02ff5cf84..8f184a852a0a7c7476eaa1cf231ab1e4d46a5dc0 100644 (file)
--- a/drivers/net/can/m_can/m_can_pci.c
+++ b/drivers/net/can/m_can/m_can_pci.c
@@ -18,14 +18,9 @@
 
 #define M_CAN_PCI_MMIO_BAR             0
 
+#define M_CAN_CLOCK_FREQ_EHL           200000000
 #define CTL_CSR_INT_CTL_OFFSET         0x508
 
-struct m_can_pci_config {
-       const struct can_bittiming_const *bit_timing;
-       const struct can_bittiming_const *data_timing;
-       unsigned int clock_freq;
-};
-
 struct m_can_pci_priv {
        struct m_can_classdev cdev;
 
@@ -89,40 +84,9 @@ static struct m_can_ops m_can_pci_ops = {
        .read_fifo = iomap_read_fifo,
 };
 
-static const struct can_bittiming_const m_can_bittiming_const_ehl = {
-       .name = KBUILD_MODNAME,
-       .tseg1_min = 2,         /* Time segment 1 = prop_seg + phase_seg1 */
-       .tseg1_max = 64,
-       .tseg2_min = 1,         /* Time segment 2 = phase_seg2 */
-       .tseg2_max = 128,
-       .sjw_max = 128,
-       .brp_min = 1,
-       .brp_max = 512,
-       .brp_inc = 1,
-};
-
-static const struct can_bittiming_const m_can_data_bittiming_const_ehl = {
-       .name = KBUILD_MODNAME,
-       .tseg1_min = 2,         /* Time segment 1 = prop_seg + phase_seg1 */
-       .tseg1_max = 16,
-       .tseg2_min = 1,         /* Time segment 2 = phase_seg2 */
-       .tseg2_max = 8,
-       .sjw_max = 4,
-       .brp_min = 1,
-       .brp_max = 32,
-       .brp_inc = 1,
-};
-
-static const struct m_can_pci_config m_can_pci_ehl = {
-       .bit_timing = &m_can_bittiming_const_ehl,
-       .data_timing = &m_can_data_bittiming_const_ehl,
-       .clock_freq = 200000000,
-};
-
 static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 {
        struct device *dev = &pci->dev;
-       const struct m_can_pci_config *cfg;
        struct m_can_classdev *mcan_class;
        struct m_can_pci_priv *priv;
        void __iomem *base;
@@ -150,8 +114,6 @@ static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
        if (!mcan_class)
                return -ENOMEM;
 
-       cfg = (const struct m_can_pci_config *)id->driver_data;
-
        priv = cdev_to_priv(mcan_class);
 
        priv->base = base;
@@ -163,9 +125,7 @@ static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
        mcan_class->dev = &pci->dev;
        mcan_class->net->irq = pci_irq_vector(pci, 0);
        mcan_class->pm_clock_support = 1;
-       mcan_class->bit_timing = cfg->bit_timing;
-       mcan_class->data_timing = cfg->data_timing;
-       mcan_class->can.clock.freq = cfg->clock_freq;
+       mcan_class->can.clock.freq = id->driver_data;
        mcan_class->ops = &m_can_pci_ops;
 
        pci_set_drvdata(pci, mcan_class);
@@ -218,8 +178,8 @@ static SIMPLE_DEV_PM_OPS(m_can_pci_pm_ops,
                         m_can_pci_suspend, m_can_pci_resume);
 
 static const struct pci_device_id m_can_pci_id_table[] = {
-       { PCI_VDEVICE(INTEL, 0x4bc1), (kernel_ulong_t)&m_can_pci_ehl, },
-       { PCI_VDEVICE(INTEL, 0x4bc2), (kernel_ulong_t)&m_can_pci_ehl, },
+       { PCI_VDEVICE(INTEL, 0x4bc1), M_CAN_CLOCK_FREQ_EHL, },
+       { PCI_VDEVICE(INTEL, 0x4bc2), M_CAN_CLOCK_FREQ_EHL, },
        {  }    /* Terminating Entry */
 };
 MODULE_DEVICE_TABLE(pci, m_can_pci_id_table);