thermal/drivers/rcar_gen3: Add support for per-SoC default trim values

The Working Sample R-Car SoCs may not yet have thermal sensor trimming
values programmed into fuses, those fuses are blank instead. For such
SoCs, the driver includes fallback trimming values. Those values are
currently applied to all SoCs which use this driver.

Introduce support for per-SoC fallback trimming values in preparation
for SoCs which do not use these current trimming values. No functional
change is intended here.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20250625181739.28391-1-marek.vasut+renesas@mailbox.org

1 files changed, 27 insertions, 14 deletions

diff --git a/drivers/thermal/renesas/rcar_gen3_thermal.c b/drivers/thermal/renesas/rcar_gen3_thermal.c
index 24a702ee4c1f..413b373523e4 100644
--- a/drivers/thermal/renesas/rcar_gen3_thermal.c
+++ b/drivers/thermal/renesas/rcar_gen3_thermal.c
@@ -73,11 +73,17 @@ struct rcar_gen3_thermal_fuse_info {
 	u32 mask;
 };
 
+struct rcar_gen3_thermal_fuse_default {
+	u32 ptat[3];
+	u32 thcodes[TSC_MAX_NUM][3];
+};
+
 struct rcar_thermal_info {
 	int scale;
 	int adj_below;
 	int adj_above;
 	const struct rcar_gen3_thermal_fuse_info *fuses;
+	const struct rcar_gen3_thermal_fuse_default *fuse_defaults;
 };
 
 struct equation_set_coef {
@@ -289,6 +295,7 @@ static void rcar_gen3_thermal_fetch_fuses(struct rcar_gen3_thermal_priv *priv)
 
 static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 {
+	const struct rcar_gen3_thermal_fuse_default *fuse_defaults = priv->info->fuse_defaults;
 	unsigned int i;
 	u32 thscp;
 
@@ -297,24 +304,16 @@ static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
 	if (!priv->info->fuses ||
 	    (thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
 		/* Default THCODE values in case FUSEs are not set. */
-		static const int thcodes[TSC_MAX_NUM][3] = {
-			{ 3397, 2800, 2221 },
-			{ 3393, 2795, 2216 },
-			{ 3389, 2805, 2237 },
-			{ 3415, 2694, 2195 },
-			{ 3356, 2724, 2244 },
-		};
-
-		priv->ptat[0] = 2631;
-		priv->ptat[1] = 1509;
-		priv->ptat[2] = 435;
+		priv->ptat[0] = fuse_defaults->ptat[0];
+		priv->ptat[1] = fuse_defaults->ptat[1];
+		priv->ptat[2] = fuse_defaults->ptat[2];
 
 		for (i = 0; i < priv->num_tscs; i++) {
 			struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
 
-			tsc->thcode[0] = thcodes[i][0];
-			tsc->thcode[1] = thcodes[i][1];
-			tsc->thcode[2] = thcodes[i][2];
+			tsc->thcode[0] = fuse_defaults->thcodes[i][0];
+			tsc->thcode[1] = fuse_defaults->thcodes[i][1];
+			tsc->thcode[2] = fuse_defaults->thcodes[i][2];
 		}
 
 		return false;
@@ -361,11 +360,23 @@ static const struct rcar_gen3_thermal_fuse_info rcar_gen3_thermal_fuse_info_gen4
 	.mask = GEN4_FUSE_MASK,
 };
 
+static const struct rcar_gen3_thermal_fuse_default rcar_gen3_thermal_fuse_default_info_gen3 = {
+	.ptat = { 2631, 1509, 435 },
+	.thcodes = {
+		{ 3397, 2800, 2221 },
+		{ 3393, 2795, 2216 },
+		{ 3389, 2805, 2237 },
+		{ 3415, 2694, 2195 },
+		{ 3356, 2724, 2244 },
+	},
+};
+
 static const struct rcar_thermal_info rcar_m3w_thermal_info = {
 	.scale = 157,
 	.adj_below = -41,
 	.adj_above = 116,
 	.fuses = &rcar_gen3_thermal_fuse_info_gen3,
+	.fuse_defaults = &rcar_gen3_thermal_fuse_default_info_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen3_thermal_info = {
@@ -373,6 +384,7 @@ static const struct rcar_thermal_info rcar_gen3_thermal_info = {
 	.adj_below = -41,
 	.adj_above = 126,
 	.fuses = &rcar_gen3_thermal_fuse_info_gen3,
+	.fuse_defaults = &rcar_gen3_thermal_fuse_default_info_gen3,
 };
 
 static const struct rcar_thermal_info rcar_gen4_thermal_info = {
@@ -380,6 +392,7 @@ static const struct rcar_thermal_info rcar_gen4_thermal_info = {
 	.adj_below = -41,
 	.adj_above = 126,
 	.fuses = &rcar_gen3_thermal_fuse_info_gen4,
+	.fuse_defaults = &rcar_gen3_thermal_fuse_default_info_gen3,
 };
 
 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {