generic: platform/mikrotik: graceful fallback for cpufreq_index

The current code would return an error on ath79 when the SoC isn't known
to the driver. Return the raw hex value instead, as happens with non
supported targets.
Also return the correctly incremented value from
sc_tag_cpufreq_ath79_arraysize()

Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>

target/linux/generic/files/drivers/platform/mikrotik/rb_softconfig.c

@@ -168,8 +168,9 @@ static ssize_t sc_tag_show_u32tvs(const u8 *pld, u16 pld_len, char *buf,
 	u32 data;	// cpu-endian
 	int i;
 
+	// fallback to raw hex output if we can't handle the input
 	if (tvselmts < 0)
-		return tvselmts;
+		return routerboot_tag_show_u32s(pld, pld_len, buf);
 
 	if (sizeof(data) != pld_len)
 		return -EINVAL;
@@ -397,30 +398,32 @@ static struct sc_u32tvs const sc_cpufreq_indexes_ath79[] = {
 	RB_SC_TVS(RB_CPU_FREQ_IDX_ATH79_F,	"f"),
 };
 
-static int sc_tag_cpufreq_ath79_idxmax(void)
+static int sc_tag_cpufreq_ath79_arraysize(void)
 {
-	int idx_max = -EOPNOTSUPP;
+	int idx_max;
 
 	if (soc_is_ar9344())
-		idx_max = RB_CPU_FREQ_IDX_ATH79_AR9334_MAX;
+		idx_max = RB_CPU_FREQ_IDX_ATH79_AR9334_MAX+1;
 	else if (soc_is_qca953x())
-		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA953X_MAX;
+		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA953X_MAX+1;
 	else if (soc_is_qca9556())
-		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA9556_MAX;
+		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA9556_MAX+1;
 	else if (soc_is_qca9558())
-		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA9558_MAX;
+		idx_max = RB_CPU_FREQ_IDX_ATH79_QCA9558_MAX+1;
+	else
+		idx_max = -EOPNOTSUPP;
 
 	return idx_max;
 }
 
 static ssize_t sc_tag_show_cpufreq_indexes(const u8 *pld, u16 pld_len, char * buf)
 {
-	return sc_tag_show_u32tvs(pld, pld_len, buf, sc_cpufreq_indexes_ath79, sc_tag_cpufreq_ath79_idxmax()+1);
+	return sc_tag_show_u32tvs(pld, pld_len, buf, sc_cpufreq_indexes_ath79, sc_tag_cpufreq_ath79_arraysize());
 }
 
 static ssize_t sc_tag_store_cpufreq_indexes(const u8 *pld, u16 pld_len, const char *buf, size_t count)
 {
-	return sc_tag_store_u32tvs(pld, pld_len, buf, count, sc_cpufreq_indexes_ath79, sc_tag_cpufreq_ath79_idxmax()+1);
+	return sc_tag_store_u32tvs(pld, pld_len, buf, count, sc_cpufreq_indexes_ath79, sc_tag_cpufreq_ath79_arraysize());
 }
 #else
  /* By default we only show the raw value to help with reverse-engineering */