Input: rmi_f54 - read from FIFO in 32 byte blocks

The F54 Report Data is apparently read through a fifo and for
the smbus protocol that means that between reading a block of 32
bytes the rmiaddr shouldn't be incremented. However, changing
that causes other non-fifo reads to fail and so that change was
reverted.

This patch changes just the F54 function and it now reads 32 bytes
at a time from the fifo, using the F54_FIFO_OFFSET to update the
start address that is used when reading from the fifo.

This has only been tested with smbus, not with i2c or spi. But I
suspect that the same is needed there since I think similar
problems will occur there when reading more than 256 bytes.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Tested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Timo Kaufmann <timokau@zoho.com>
Link: https://lore.kernel.org/r/20200115124819.3191024-3-hverkuil-cisco@xs4all.nlSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/rmi_f54.c

@@ -24,6 +24,12 @@
 #define F54_NUM_TX_OFFSET       1
 #define F54_NUM_RX_OFFSET       0
 
+/*
+ * The smbus protocol can read only 32 bytes max at a time.
+ * But this should be fine for i2c/spi as well.
+ */
+#define F54_REPORT_DATA_SIZE	32
+
 /* F54 commands */
 #define F54_GET_REPORT          1
 #define F54_FORCE_CAL           2
@@ -526,6 +532,7 @@ static void rmi_f54_work(struct work_struct *work)
 	int report_size;
 	u8 command;
 	int error;
+	int i;
 
 	report_size = rmi_f54_get_report_size(f54);
 	if (report_size == 0) {
@@ -558,8 +565,11 @@ static void rmi_f54_work(struct work_struct *work)
 
 	rmi_dbg(RMI_DEBUG_FN, &fn->dev, "Get report command completed, reading data\n");
 
-	fifo[0] = 0;
-	fifo[1] = 0;
+	for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) {
+		int size = min(F54_REPORT_DATA_SIZE, report_size - i);
+
+		fifo[0] = i & 0xff;
+		fifo[1] = i >> 8;
 		error = rmi_write_block(fn->rmi_dev,
 					fn->fd.data_base_addr + F54_FIFO_OFFSET,
 					fifo, sizeof(fifo));
@@ -569,13 +579,14 @@ static void rmi_f54_work(struct work_struct *work)
 		}
 
 		error = rmi_read_block(fn->rmi_dev, fn->fd.data_base_addr +
-			       F54_REPORT_DATA_OFFSET, f54->report_data,
-			       report_size);
+				       F54_REPORT_DATA_OFFSET,
+				       f54->report_data + i, size);
 		if (error) {
 			dev_err(&fn->dev, "%s: read [%d bytes] returned %d\n",
-			__func__, report_size, error);
+				__func__, size, error);
 			goto abort;
 		}
+	}
 
 abort:
 	f54->report_size = error ? 0 : report_size;