On Thu, May 27, 2021 at 09:43:33PM +0200, Robert Marko wrote:
[ ... ]

I can confirm that this does indeed enable block reads and
i2c_smbus_read_block_data()
works now.

Follow-up:

quoted

+static void
+mv64xxx_i2c_do_read_data(struct mv64xxx_i2c_data *drv_data)
+{
+       u8 data;
+
+       data = readl(drv_data->reg_base + drv_data->reg_offsets.data);
+       drv_data->msg->buf[drv_data->byte_posn++] = data;
+
+       if (drv_data->msg->flags & I2C_M_RECV_LEN) {
+               if (!data || data > I2C_SMBUS_BLOCK_MAX) {
+                       /*
+                        * FIXME
+                        * Abort and report error. Needs to be
+                        * verified/tested on real hardware.
+                        */
+                       drv_data->rc = -EPROTO;
+                       mv64xxx_i2c_do_send_stop(drv_data);
+                       return;

Can you possibly test if this works ? Trying a block read on
any register which returns 0 or > 32 as first byte should do.

Thanks,
Guenter