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From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
To:     matthias.bgg@gmail.com
Cc:     krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
        robh+dt@kernel.org, angelogioacchino.delregno@collabora.com,
        p.zabel@pengutronix.de, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, kernel@collabora.com,
        wenst@chromium.org
Subject: [PATCH v3 05/20] soc: mediatek: mtk-svs: Reduce memory footprint of struct svs_bank
Date:   Tue, 21 Nov 2023 13:50:29 +0100
Message-ID: <20231121125044.78642-6-angelogioacchino.delregno@collabora.com>
In-Reply-To: <20231121125044.78642-1-angelogioacchino.delregno@collabora.com>
References: <20231121125044.78642-1-angelogioacchino.delregno@collabora.com>
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Many 32-bit members of this struct can be size reduced to either 16-bit
or even 8-bit, for a total saving of ~61 bytes per bank. Keeping in mind
that one SoC declares at least two banks, this brings a minimum of ~122
bytes saving (depending on compiler optimization).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 drivers/soc/mediatek/mtk-svs.c | 51 +++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
index 1c7592fd6ae7..6c27fb523bfa 100644
--- a/drivers/soc/mediatek/mtk-svs.c
+++ b/drivers/soc/mediatek/mtk-svs.c
@@ -456,13 +456,13 @@ struct svs_bank {
 	char *buck_name;
 	char *tzone_name;
 	enum svsb_phase phase;
-	s32 volt_od;
+	short int volt_od;
 	u32 reg_data[SVSB_PHASE_MAX][SVS_REG_MAX];
 	u32 pm_runtime_enabled_count;
-	u32 mode_support;
+	u8 mode_support;
 	u32 freq_base;
 	u32 turn_freq_base;
-	u32 vboot;
+	u8 vboot;
 	u32 opp_dfreq[MAX_OPP_ENTRIES];
 	u32 opp_dvolt[MAX_OPP_ENTRIES];
 	u32 freq_pct[MAX_OPP_ENTRIES];
@@ -470,36 +470,36 @@ struct svs_bank {
 	u32 volt_step;
 	u32 volt_base;
 	u32 volt_flags;
-	u32 vmax;
-	u32 vmin;
+	u8 vmax;
+	u8 vmin;
 	u32 age_config;
-	u32 age_voffset_in;
+	u16 age_voffset_in;
 	u32 dc_config;
-	u32 dc_voffset_in;
-	u32 dvt_fixed;
-	u32 vco;
-	u32 chk_shift;
+	u16 dc_voffset_in;
+	u8 dvt_fixed;
+	u8 vco;
+	u8 chk_shift;
 	u32 core_sel;
-	u32 opp_count;
+	u8 opp_count;
 	u32 int_st;
-	u32 sw_id;
-	u32 cpu_id;
+	u8 sw_id;
+	u8 cpu_id;
 	u32 ctl0;
 	u32 temp;
 	u32 tzone_htemp;
-	u32 tzone_htemp_voffset;
+	u16 tzone_htemp_voffset;
 	u32 tzone_ltemp;
-	u32 tzone_ltemp_voffset;
-	u32 bts;
-	u32 mts;
-	u32 bdes;
-	u32 mdes;
-	u32 mtdes;
-	u32 dcbdet;
-	u32 dcmdet;
+	u16 tzone_ltemp_voffset;
+	u16 bts;
+	u16 mts;
+	u16 bdes;
+	u16 mdes;
+	u8 mtdes;
+	u8 dcbdet;
+	u8 dcmdet;
 	u32 turn_pt;
 	u32 vbin_turn_pt;
-	u32 type;
+	u8 type;
 };
 
 static u32 percent(u32 numerator, u32 denominator)
@@ -1267,6 +1267,7 @@ static inline void svs_error_isr_handler(struct svs_platform *svsp)
 static inline void svs_init01_isr_handler(struct svs_platform *svsp)
 {
 	struct svs_bank *svsb = svsp->pbank;
+	u32 val;
 
 	dev_info(svsb->dev, "%s: VDN74~30:0x%08x~0x%08x, DC:0x%08x\n",
 		 __func__, svs_readl_relaxed(svsp, VDESIGN74),
@@ -1276,8 +1277,8 @@ static inline void svs_init01_isr_handler(struct svs_platform *svsp)
 	svs_save_bank_register_data(svsp, SVSB_PHASE_INIT01);
 
 	svsb->phase = SVSB_PHASE_INIT01;
-	svsb->dc_voffset_in = ~(svs_readl_relaxed(svsp, DCVALUES) &
-				GENMASK(15, 0)) + 1;
+	val = ~(svs_readl_relaxed(svsp, DCVALUES) & GENMASK(15, 0)) + 1;
+	svsb->dc_voffset_in = val & GENMASK(15, 0);
 	if (svsb->volt_flags & SVSB_INIT01_VOLT_IGNORE ||
 	    (svsb->dc_voffset_in & SVSB_DC_SIGNED_BIT &&
 	     svsb->volt_flags & SVSB_INIT01_VOLT_INC_ONLY))
-- 
2.42.0