linux-kernel - [PATCH v4 6/8] i2c: mediatek: Add OFFSET_EXT

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Message-ID: <1626517079-9057-7-git-send-email-kewei.xu@mediatek.com>
Date:   Sat, 17 Jul 2021 18:17:57 +0800
From:   Kewei Xu <kewei.xu@...iatek.com>
To:     <wsa@...-dreams.de>
CC:     <matthias.bgg@...il.com>, <robh+dt@...nel.org>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <leilk.liu@...iatek.com>,
        <qii.wang@...iatek.com>, <yuhan.wei@...iatek.com>,
        <kewei.xu@...iatek.com>, <ot_daolong.zhu@...iatek.com>,
        <liguo.zhang@...iatek.com>
Subject: [PATCH v4 6/8] i2c: mediatek: Add OFFSET_EXT_CONF setting back

In the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust
support"), we miss setting OFFSET_EXT_CONF register if
i2c->dev_comp->timing_adjust is false, now add it back.

Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support")
Signed-off-by: Kewei Xu <kewei.xu@...iatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index abdbf27b6eb4..a2a5a4ec1d81 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -41,6 +41,8 @@
 #define I2C_HANDSHAKE_RST		0x0020
 #define I2C_FIFO_ADDR_CLR		0x0001
 #define I2C_DELAY_LEN			0x0002
+#define I2C_ST_START_CON		0x8001
+#define I2C_FS_START_CON		0x1800
 #define I2C_TIME_CLR_VALUE		0x0000
 #define I2C_TIME_DEFAULT_VALUE		0x0003
 #define I2C_WRRD_TRANAC_VALUE		0x0002
@@ -484,6 +486,7 @@ static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
 static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 {
 	u16 control_reg;
+	u16 ext_conf_val;
 
 	if (i2c->dev_comp->apdma_sync) {
 		writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST);
@@ -518,8 +521,13 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 	if (i2c->dev_comp->ltiming_adjust)
 		mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING);
 
+	if (i2c->speed_hz <= I2C_MAX_STANDARD_MODE_FREQ)
+		ext_conf_val = I2C_ST_START_CON;
+	else
+		ext_conf_val = I2C_FS_START_CON;
+
 	if (i2c->dev_comp->timing_adjust) {
-		mtk_i2c_writew(i2c, i2c->ac_timing.ext, OFFSET_EXT_CONF);
+		ext_conf_val = i2c->ac_timing.ext;
 		mtk_i2c_writew(i2c, i2c->ac_timing.inter_clk_div,
 			       OFFSET_CLOCK_DIV);
 		mtk_i2c_writew(i2c, I2C_SCL_MIS_COMP_VALUE,
@@ -544,6 +552,7 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 				       OFFSET_HS_STA_STO_AC_TIMING);
 		}
 	}
+	mtk_i2c_writew(i2c, ext_conf_val, OFFSET_EXT_CONF);
 
 	/* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */
 	if (i2c->have_pmic)
-- 
2.18.0