[src/thorpej-i2c-spi-conf]: src/sys/dev/i2c Go back to probing in the direct ...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e6ffdd6f9033
branches:  thorpej-i2c-spi-conf
changeset: 1020819:e6ffdd6f9033
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun May 16 22:53:57 2021 +0000

description:
Go back to probing in the direct config case, and return a high confidence
match value if the SPD probe succeeds.  This ensures that we beat a generic
i2c serial eeprom driver if the contents looks like they contain SPD data.

diffstat:

 sys/dev/i2c/spdmem_i2c.c |  30 ++++++++++++++++++++----------
 1 files changed, 20 insertions(+), 10 deletions(-)

diffs (91 lines):

diff -r 6c5a2a823281 -r e6ffdd6f9033 sys/dev/i2c/spdmem_i2c.c
--- a/sys/dev/i2c/spdmem_i2c.c  Sun May 16 21:04:59 2021 +0000
+++ b/sys/dev/i2c/spdmem_i2c.c  Sun May 16 22:53:57 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: spdmem_i2c.c,v 1.21.4.3 2021/05/16 15:40:20 thorpej Exp $ */
+/* $NetBSD: spdmem_i2c.c,v 1.21.4.4 2021/05/16 22:53:57 thorpej Exp $ */
 
 /*
  * Copyright (c) 2007 Nicolas Joly
@@ -40,7 +40,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: spdmem_i2c.c,v 1.21.4.3 2021/05/16 15:40:20 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spdmem_i2c.c,v 1.21.4.4 2021/05/16 22:53:57 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -190,6 +190,8 @@
        DEVICE_COMPAT_EOL
 };
 
+#define        SPDMEM_HIGH_CONFIDENCE_MATCH    (I2C_MATCH_DIRECT_COMPATIBLE + 20)
+
 static bool
 spdmem_i2c_use_name_match(const struct i2c_attach_args *ia, int *match_resultp)
 {
@@ -197,7 +199,7 @@
 
        if (name != NULL) {
                *match_resultp = device_compatible_match(&name, 1, name_data)
-                   ? I2C_MATCH_DIRECT_COMPATIBLE
+                   ? SPDMEM_HIGH_CONFIDENCE_MATCH
                    : 0;
                return true;
        }
@@ -209,9 +211,6 @@
                            const struct device_compatible_entry *cdata,
                            int *match_resultp)
 {
-       if (iic_use_direct_match(ia, cf, cdata, match_resultp))
-               return true;
-
        /*
         * Matching by name is not ideal, but some device trees only
         * have a name and no "compatible" property.
@@ -219,6 +218,9 @@
        if (spdmem_i2c_use_name_match(ia, match_resultp))
                return true;
 
+       if (iic_use_direct_match(ia, cf, cdata, match_resultp))
+               return true;
+
        return false;
 }
 
@@ -230,7 +232,7 @@
        int match_result;
 
        if (spdmem_i2c_use_direct_match(ia, match, compat_data, &match_result))
-               return match_result;
+               goto do_probe;
 
        /* Filter out by address when not using direct config. */
        if ((ia->ia_addr & SPDMEM_I2C_ADDRMASK) != SPDMEM_I2C_ADDR)
@@ -241,14 +243,22 @@
        sc.sc_page0 = SPDCTL_SPA0;
        sc.sc_page1 = SPDCTL_SPA1;
        sc.sc_base.sc_read = spdmem_i2c_read;
+       match_result = SPDMEM_HIGH_CONFIDENCE_MATCH;
 
+ do_probe:
        /* Check the bank and reset to the page 0 */
        if (spdmem_reset_page(&sc) != 0)
                return 0;
 
-       return spdmem_common_probe(&sc.sc_base)
-           ? I2C_MATCH_ADDRESS_AND_PROBE
-           : 0;
+       if (spdmem_common_probe(&sc.sc_base)) {
+               if (match_result < SPDMEM_HIGH_CONFIDENCE_MATCH) {
+                       match_result = SPDMEM_HIGH_CONFIDENCE_MATCH;
+               }
+       } else {
+               match_result = 0;
+       }
+
+       return match_result;
 }
 
 static void