Author: bz
Date: Sun Mar 31 19:27:44 2019
New Revision: 345757
URL: https://svnweb.freebsd.org/changeset/base/345757

Log:
  Improve debugging options in bcm2835_sdhci.c
  
  Similar to bcm2835_sdhost.c add a TUNABLE and SYSCTL to selectively
  turn on debugging printfs if debugging is turned on at compile time.
  
  MFC after:            2 weeks
  Sponsored by:         The FreeBSD Foundation
  Reviewed by:          gonzo, andrew
  Differential Revision:        https://reviews.freebsd.org/D19745

Modified:
  head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c

Modified: head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c
==============================================================================
--- head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c       Sun Mar 31 17:27:28 
2019        (r345756)
+++ head/sys/arm/broadcom/bcm2835/bcm2835_sdhci.c       Sun Mar 31 19:27:44 
2019        (r345757)
@@ -66,8 +66,17 @@ __FBSDID("$FreeBSD$");
 #define        NUM_DMA_SEGS                    2
 
 #ifdef DEBUG
-#define dprintf(fmt, args...) do { printf("%s(): ", __func__);   \
-    printf(fmt,##args); } while (0)
+static int bcm2835_sdhci_debug = 0;
+
+TUNABLE_INT("hw.bcm2835.sdhci.debug", &bcm2835_sdhci_debug);
+SYSCTL_INT(_hw_sdhci, OID_AUTO, bcm2835_sdhci_debug, CTLFLAG_RWTUN,
+    &bcm2835_sdhci_debug, 0, "bcm2835 SDHCI debug level");
+
+#define        dprintf(fmt, args...)                                   \
+       do {                                                    \
+               if (bcm2835_sdhci_debug)                        \
+                       printf("%s: " fmt, __func__, ##args);   \
+       }  while (0)
 #else
 #define dprintf(fmt, args...)
 #endif


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