soc: mediatek: mtk-svs: Check if SVS mode is available in the beginning

The svs_init01() and svs_init02() functions are already checking if the
INIT01 and INIT02 modes are available - but that's done in for loops and
for each SVS bank.

Give those a shortcut to get out early if no SVS bank features the
desired init mode: this is especially done to avoid some locking in
the svs_init01(), but also to avoid multiple for loops to check the
same, when no bank supports a specific mode.

Link: https://lore.kernel.org/r/20231121125044.78642-17-angelogioacchino.delregno@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

drivers/soc/mediatek/mtk-svs.c

@@ -1400,6 +1400,16 @@ static irqreturn_t svs_isr(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static bool svs_mode_available(struct svs_platform *svsp, u8 mode)
+{
+	int i;
+
+	for (i = 0; i < svsp->bank_max; i++)
+		if (svsp->banks[i].mode_support & mode)
+			return true;
+	return false;
+}
+
 static int svs_init01(struct svs_platform *svsp)
 {
 	struct svs_bank *svsb;
@@ -1408,6 +1418,9 @@ static int svs_init01(struct svs_platform *svsp)
 	int ret = 0, r;
 	u32 opp_freq, opp_vboot, buck_volt, idx, i;
 
+	if (!svs_mode_available(svsp, SVSB_MODE_INIT01))
+		return 0;
+
 	/* Keep CPUs' core power on for svs_init01 initialization */
 	cpuidle_pause_and_lock();
 
@@ -1575,6 +1588,9 @@ static int svs_init02(struct svs_platform *svsp)
 	int ret;
 	u32 idx;
 
+	if (!svs_mode_available(svsp, SVSB_MODE_INIT02))
+		return 0;
+
 	for (idx = 0; idx < svsp->bank_max; idx++) {
 		svsb = &svsp->banks[idx];