linux-kernel - [PATCH 06/13] soc: mediatek: mtk-dvfsrc: Add a new callback for calc_dram

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Message-Id: <20251114-mt8196-dvfsrc-v1-6-b956d4631468@collabora.com>
Date: Fri, 14 Nov 2025 17:54:00 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Henry Chen <henryc.chen@...iatek.com>, Georgi Djakov <djakov@...nel.org>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH 06/13] soc: mediatek: mtk-dvfsrc: Add a new callback for
 calc_dram_bw

From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

In preparation for adding support for DVFSRC Version 4, add a new
callback for calculating the dram bandwidth, assign the current
calculation algo to all of the currently supported SoCs, and use
this in __dvfsrc_set_dram_bw_v1().

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/soc/mediatek/mtk-dvfsrc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/mediatek/mtk-dvfsrc.c b/drivers/soc/mediatek/mtk-dvfsrc.c
index a684e405daf7..3cbccbb7469a 100644
--- a/drivers/soc/mediatek/mtk-dvfsrc.c
+++ b/drivers/soc/mediatek/mtk-dvfsrc.c
@@ -73,6 +73,7 @@ struct mtk_dvfsrc {
 struct dvfsrc_soc_data {
 	const int *regs;
 	const struct dvfsrc_opp_desc *opps_desc;
+	u32 (*calc_dram_bw)(struct mtk_dvfsrc *dvfsrc, int type, u64 bw);
 	u32 (*get_target_level)(struct mtk_dvfsrc *dvfsrc);
 	u32 (*get_current_level)(struct mtk_dvfsrc *dvfsrc);
 	u32 (*get_vcore_level)(struct mtk_dvfsrc *dvfsrc);
@@ -274,10 +275,15 @@ static void dvfsrc_set_vscp_level_v2(struct mtk_dvfsrc *dvfsrc, u32 level)
 	dvfsrc_writel(dvfsrc, DVFSRC_VCORE, val);
 }
 
+static u32 dvfsrc_calc_dram_bw_v1(struct mtk_dvfsrc *dvfsrc, int type, u64 bw)
+{
+	return (u32)div_u64(bw, 100 * 1000);
+}
+
 static void __dvfsrc_set_dram_bw_v1(struct mtk_dvfsrc *dvfsrc, u32 reg,
 				    int type, u16 max_bw, u16 min_bw, u64 bw)
 {
-	u32 new_bw = (u32)div_u64(bw, 100 * 1000);
+	u32 new_bw = dvfsrc->dvd->calc_dram_bw(dvfsrc, type, bw);
 
 	/* If bw constraints (in mbps) are defined make sure to respect them */
 	if (max_bw)
@@ -519,6 +525,7 @@ static const struct dvfsrc_opp_desc dvfsrc_opp_mt8183_desc[] = {
 static const struct dvfsrc_soc_data mt8183_data = {
 	.opps_desc = dvfsrc_opp_mt8183_desc,
 	.regs = dvfsrc_mt8183_regs,
+	.calc_dram_bw = dvfsrc_calc_dram_bw_v1,
 	.get_target_level = dvfsrc_get_target_level_v1,
 	.get_current_level = dvfsrc_get_current_level_v1,
 	.get_vcore_level = dvfsrc_get_vcore_level_v1,
@@ -549,6 +556,7 @@ static const struct dvfsrc_opp_desc dvfsrc_opp_mt8195_desc[] = {
 static const struct dvfsrc_soc_data mt8195_data = {
 	.opps_desc = dvfsrc_opp_mt8195_desc,
 	.regs = dvfsrc_mt8195_regs,
+	.calc_dram_bw = dvfsrc_calc_dram_bw_v1,
 	.get_target_level = dvfsrc_get_target_level_v2,
 	.get_current_level = dvfsrc_get_current_level_v2,
 	.get_vcore_level = dvfsrc_get_vcore_level_v2,

-- 
2.51.2