i2c: designware: Fix improper usage of readl

Kernel test robot reported incorrect type in argument 1 of readl(), but
more importantly it brought attention that MMIO accessor shouldn't be
used in this case, since req->hdr.status is part of a command-response
buffer in system memory.

Since its value may be altered by PSP outside of the scope of current
thread (somehow similar to IRQ handler case), we need to use
READ_ONCE() to ensure compiler won't optimize this call.

Fix also 'status' variable type to reflect that corresponding field in
command-response buffer is platform-independent u32.

Fixes: 78d5e9e2 ("i2c: designware: Add AMD PSP I2C bus support")
Signed-off-by: Jan Dabros <jsd@semihalf.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-amdpsp.c

@@ -160,9 +160,10 @@ static int psp_send_cmd(struct psp_i2c_req *req)
 /* Helper to verify status returned by PSP */
 static int check_i2c_req_sts(struct psp_i2c_req *req)
 {
-	int status;
+	u32 status;
 
-	status = readl(&req->hdr.status);
+	/* Status field in command-response buffer is updated by PSP */
+	status = READ_ONCE(req->hdr.status);
 
 	switch (status) {
 	case PSP_I2C_REQ_STS_OK: