[REGRESSION] spi: omap2-mcspi: not working with kernel v6.10

[João Paulo Gonçalves]

Hello,

It appears that omap2-mcspi broke on kernel v6.10. I was testing an EEPROM like
SPI FRAM using this DT:

&main_spi1 {
	pinctrl-0 = <&pinctrl_spi1>,
		    <&pinctrl_gpio_4>;
	cs-gpios =  <&mcu_gpio0 4 GPIO_ACTIVE_LOW>;
	status = "okay";

	fram@0 {
		compatible = "fujitsu,mb85rs256", "atmel,at25";
		reg = <0>;
		address-width = <16>;
		size = <32768>;
		spi-max-frequency = <33000000>;
		pagesize = <1>;
	};
};

On kernel v6.9, spi works fine and is possible to read/write the FRAM. However,
on kernel v6.10-rc3 it gives me an Oops after a timeout:

[  201.966498] Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
[  201.972764] Modules linked in: cfg80211 bluetooth ecdh_generic ecc rfkill
usb_f_ncm u_ether crct10dif_ce powervr drm_gpuvm drm_exec drm_shmem_helper
mux_gpio gpu_sched rtc_ti_k3 k3_j72xx_bandgap rti_wdt tps65219_pwrbutton
ti_ads1015 m_can_platform rtc_ds1307 industrialio_triggered_buffer sa2ul
m_can kfifo_buf lm75 authenc can_dev at24 spi_omap2_mcspi omap_mailbox
libcomposite fuse drm backlight ipv6
[  202.008216] CPU: 1 PID: 462 Comm: hexdump Not tainted 6.10.0-rc3-00002-g05e382bde33c #1
[  202.016213] Hardware name: Toradex Verdin AM62 on Ivy Board (DT)
[  202.022212] pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  202.029167] pc : omap2_mcspi_transfer_one+0x7d8/0xb78 [spi_omap2_mcspi]
[  202.035790] lr : omap2_mcspi_transfer_one+0x7d4/0xb78 [spi_omap2_mcspi]
[  202.042397] sp : ffff80008384b7d0
[  202.045703] x29: ffff80008384b7d0 x28: ffff0000036b0c00 x27: ffff80008328313c
[  202.052838] x26: ffff00000461cd80 x25: ffff000004625640 x24: ffff00001db00000
[  202.059971] x23: ffff800083283130 x22: 0000000000000000 x21: 00000000e5c8ed77
[  202.067103] x20: ffff80008384bb88 x19: 0000000000000000 x18: 0000000000000000
[  202.074235] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
[  202.081367] x14: 00000000000000e6 x13: 0000000000000000 x12: 0000000000000001
[  202.088499] x11: ffff0000046256c0 x10: 0000000000000aa0 x9 : 0000000020000000
[  202.095632] x8 : 0000000000000000 x7 : 0000000020161bc4 x6 : ffff00000421e780
[  202.102765] x5 : 0000000000000000 x4 : ffff8000825e7000 x3 : 00000000ffffa0ff
[  202.109897] x2 : 0000000000000002 x1 : 0000000000000002 x0 : 0000000000000000
[  202.117030] Call trace:
[  202.119471]  omap2_mcspi_transfer_one+0x7d8/0xb78 [spi_omap2_mcspi]
[  202.125734]  spi_transfer_one_message+0x2fc/0x648
[  202.130442]  __spi_pump_transfer_message+0x234/0x4e8
[  202.135401]  __spi_sync+0x2a8/0x3c0
[  202.138885]  spi_sync+0x30/0x54
[  202.142022]  at25_ee_read+0x160/0x230
[  202.145682]  nvmem_reg_read+0x24/0x4c
[  202.149346]  bin_attr_nvmem_read+0x84/0xb4
[  202.153439]  sysfs_kf_bin_read+0x6c/0x8c
[  202.157364]  kernfs_fop_read_iter+0xa0/0x1b4
[  202.161630]  vfs_read+0x24c/0x2f4
[  202.164944]  ksys_read+0x6c/0xf8
[  202.168168]  __arm64_sys_read+0x1c/0x28
[  202.172000]  invoke_syscall+0x44/0x108
[  202.175749]  el0_svc_common.constprop.0+0xc0/0xe0
[  202.180450]  do_el0_svc+0x1c/0x28
[  202.183761]  el0_svc+0x34/0xdc
[  202.186815]  el0t_64_sync_handler+0xc0/0xc4
[  202.190994]  el0t_64_sync+0x190/0x194
[  202.194658] Code: aa1703e0 d2800041 97fffb9f 37f80e40 (b8404700)
[  202.200746] ---[ end trace 0000000000000000 ]---

Regards,
João Paulo Gonçalves