pcmcia/yenta: guide users in case of problems with O2-bridges

Some cards need the speedups on, some need them off. As we can't detect
this reliably, at least give the users a hint how to tweak the system.

Reported-by: David Bluecame <david.bluecame@gmail.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

diff --git a/drivers/pcmcia/o2micro.h b/drivers/pcmcia/o2micro.h
index e74bebac26950b2c9d5869c310f835ef99662b64..5096e92c7a4cfb39e1e300f5d8ac8016b5fe54d4 100644 (file)
--- a/drivers/pcmcia/o2micro.h
+++ b/drivers/pcmcia/o2micro.h
@@ -153,14 +153,14 @@ static int o2micro_override(struct yenta_socket *socket)
 
                if (use_speedup) {
                        dev_info(&socket->dev->dev,
-                               "O2: enabling read prefetch/write burst\n");
+                               "O2: enabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=off'\n");
                        config_writeb(socket, O2_RESERVED1,
                                      a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
                        config_writeb(socket, O2_RESERVED2,
                                      b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
                } else {
                        dev_info(&socket->dev->dev,
-                               "O2: disabling read prefetch/write burst\n");
+                               "O2: disabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=on'\n");
                        config_writeb(socket, O2_RESERVED1,
                                      a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
                        config_writeb(socket, O2_RESERVED2,