X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fdrm_print.c;h=dfa27367ebb8537ec8874616e0f0b5532de34121;hb=2dc5d44ccc5e7f032dbea2735b243f7f50ff863e;hp=a17c8a14dba4f9401c7ffbfed8d1eda4d0e2153a;hpb=5fe7b600a116187e10317d83fb56922c4ef6b76d;p=linux.git

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index a17c8a14dba4..dfa27367ebb8 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -147,6 +147,12 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
 }
 EXPORT_SYMBOL(__drm_printfn_debug);
 
+void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
+{
+	pr_err("*ERROR* %s %pV", p->prefix, vaf);
+}
+EXPORT_SYMBOL(__drm_printfn_err);
+
 /**
  * drm_puts - print a const string to a &drm_printer stream
  * @p: the &drm printer
@@ -179,6 +185,39 @@ void drm_printf(struct drm_printer *p, const char *f, ...)
 }
 EXPORT_SYMBOL(drm_printf);
 
+/**
+ * drm_print_bits - print bits to a &drm_printer stream
+ *
+ * Print bits (in flag fields for example) in human readable form.
+ * The first name in the @bits array is for the bit indexed by @from.
+ *
+ * @p: the &drm_printer
+ * @value: field value.
+ * @bits: Array with bit names.
+ * @from: start of bit range to print (inclusive).
+ * @to: end of bit range to print (exclusive).
+ */
+void drm_print_bits(struct drm_printer *p,
+		    unsigned long value, const char *bits[],
+		    unsigned int from, unsigned int to)
+{
+	bool first = true;
+	unsigned int i;
+
+	for (i = from; i < to; i++) {
+		if (!(value & (1 << i)))
+			continue;
+		if (WARN_ON_ONCE(!bits[i-from]))
+			continue;
+		drm_printf(p, "%s%s", first ? "" : ",",
+			   bits[i-from]);
+		first = false;
+	}
+	if (first)
+		drm_printf(p, "(none)");
+}
+EXPORT_SYMBOL(drm_print_bits);
+
 void drm_dev_printk(const struct device *dev, const char *level,
 		    const char *format, ...)
 {