[PATCH v2 0/4] add i2c support for mt8192

[PATCH v2 0/4] add i2c support for mt8192

[Qii Wang]

This series are based on 5.8-rc1 and we provide four i2c patches
to support mt8192 SoC.

Main changes compared to v1:
--modify the commit with access more than 8GB dram
--add Reviewed-by and Acked-by from Yingjoe, Matthias and Rob

Qii Wang (4):
  i2c: mediatek: Add apdma sync in i2c driver
  i2c: mediatek: Add access to more than 8GB dram in i2c driver
  dt-bindings: i2c: update bindings for MT8192 SoC
  i2c: mediatek: Add i2c compatible for MediaTek MT8192

 .../devicetree/bindings/i2c/i2c-mt65xx.txt         |  1 +
 drivers/i2c/busses/i2c-mt65xx.c                    | 76 +++++++++++++++-------
 2 files changed, 53 insertions(+), 24 deletions(-)

-- 
1.9.1

[PATCH v2 1/4] i2c: mediatek: Add apdma sync in i2c driver

[Qii Wang]

With the apdma remove hand-shake signal, it need to keep i2c and
apdma in sync manually.

Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Qii Wang <qii.wang@mediatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index deef69e..e6b984a 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -48,6 +48,9 @@
 
 #define I2C_DMA_CON_TX			0x0000
 #define I2C_DMA_CON_RX			0x0001
+#define I2C_DMA_ASYNC_MODE		0x0004
+#define I2C_DMA_SKIP_CONFIG		0x0010
+#define I2C_DMA_DIR_CHANGE		0x0200
 #define I2C_DMA_START_EN		0x0001
 #define I2C_DMA_INT_FLAG_NONE		0x0000
 #define I2C_DMA_CLR_FLAG		0x0000
@@ -205,6 +208,7 @@ struct mtk_i2c_compatible {
 	unsigned char timing_adjust: 1;
 	unsigned char dma_sync: 1;
 	unsigned char ltiming_adjust: 1;
+	unsigned char apdma_sync: 1;
 };
 
 struct mtk_i2c_ac_timing {
@@ -311,6 +315,7 @@ struct i2c_spec_values {
 	.timing_adjust = 1,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
+	.apdma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt6577_compat = {
@@ -324,6 +329,7 @@ struct i2c_spec_values {
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
+	.apdma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt6589_compat = {
@@ -337,6 +343,7 @@ struct i2c_spec_values {
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
+	.apdma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt7622_compat = {
@@ -350,6 +357,7 @@ struct i2c_spec_values {
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
+	.apdma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt8173_compat = {
@@ -362,6 +370,7 @@ struct i2c_spec_values {
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
+	.apdma_sync = 0,
 };
 
 static const struct mtk_i2c_compatible mt8183_compat = {
@@ -375,6 +384,7 @@ struct i2c_spec_values {
 	.timing_adjust = 1,
 	.dma_sync = 1,
 	.ltiming_adjust = 1,
+	.apdma_sync = 0,
 };
 
 static const struct of_device_id mtk_i2c_of_match[] = {
@@ -798,6 +808,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 	u16 start_reg;
 	u16 control_reg;
 	u16 restart_flag = 0;
+	u16 dma_sync = 0;
 	u32 reg_4g_mode;
 	u8 *dma_rd_buf = NULL;
 	u8 *dma_wr_buf = NULL;
@@ -851,10 +862,16 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 		mtk_i2c_writew(i2c, num, OFFSET_TRANSAC_LEN);
 	}
 
+	if (i2c->dev_comp->apdma_sync) {
+		dma_sync = I2C_DMA_SKIP_CONFIG | I2C_DMA_ASYNC_MODE;
+		if (i2c->op == I2C_MASTER_WRRD)
+			dma_sync |= I2C_DMA_DIR_CHANGE;
+	}
+
 	/* Prepare buffer data to start transfer */
 	if (i2c->op == I2C_MASTER_RD) {
 		writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
-		writel(I2C_DMA_CON_RX, i2c->pdmabase + OFFSET_CON);
+		writel(I2C_DMA_CON_RX | dma_sync, i2c->pdmabase + OFFSET_CON);
 
 		dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
 		if (!dma_rd_buf)
@@ -877,7 +894,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 		writel(msgs->len, i2c->pdmabase + OFFSET_RX_LEN);
 	} else if (i2c->op == I2C_MASTER_WR) {
 		writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
-		writel(I2C_DMA_CON_TX, i2c->pdmabase + OFFSET_CON);
+		writel(I2C_DMA_CON_TX | dma_sync, i2c->pdmabase + OFFSET_CON);
 
 		dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
 		if (!dma_wr_buf)
@@ -900,7 +917,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 		writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN);
 	} else {
 		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
-		writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_CON);
+		writel(I2C_DMA_CLR_FLAG | dma_sync, i2c->pdmabase + OFFSET_CON);
 
 		dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
 		if (!dma_wr_buf)
-- 
1.9.1

[PATCH v2 2/4] i2c: mediatek: Add access to more than 8GB dram in i2c driver

[Qii Wang]

Newer MTK chip support more than 8GB of dram. Replace support_33bits
with more general dma_max_support and remove mtk_i2c_set_4g_mode.

Signed-off-by: Qii Wang <qii.wang@mediatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 38 +++++++++++++++++---------------------
 1 file changed, 17 insertions(+), 21 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index e6b984a..49777a6 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -204,11 +204,11 @@ struct mtk_i2c_compatible {
 	unsigned char dcm: 1;
 	unsigned char auto_restart: 1;
 	unsigned char aux_len_reg: 1;
-	unsigned char support_33bits: 1;
 	unsigned char timing_adjust: 1;
 	unsigned char dma_sync: 1;
 	unsigned char ltiming_adjust: 1;
 	unsigned char apdma_sync: 1;
+	unsigned char max_dma_support;
 };
 
 struct mtk_i2c_ac_timing {
@@ -311,11 +311,11 @@ struct i2c_spec_values {
 	.dcm = 1,
 	.auto_restart = 1,
 	.aux_len_reg = 1,
-	.support_33bits = 1,
 	.timing_adjust = 1,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
 	.apdma_sync = 0,
+	.max_dma_support = 33,
 };
 
 static const struct mtk_i2c_compatible mt6577_compat = {
@@ -325,11 +325,11 @@ struct i2c_spec_values {
 	.dcm = 1,
 	.auto_restart = 0,
 	.aux_len_reg = 0,
-	.support_33bits = 0,
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
 	.apdma_sync = 0,
+	.max_dma_support = 32,
 };
 
 static const struct mtk_i2c_compatible mt6589_compat = {
@@ -339,11 +339,11 @@ struct i2c_spec_values {
 	.dcm = 0,
 	.auto_restart = 0,
 	.aux_len_reg = 0,
-	.support_33bits = 0,
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
 	.apdma_sync = 0,
+	.max_dma_support = 32,
 };
 
 static const struct mtk_i2c_compatible mt7622_compat = {
@@ -353,11 +353,11 @@ struct i2c_spec_values {
 	.dcm = 1,
 	.auto_restart = 1,
 	.aux_len_reg = 1,
-	.support_33bits = 0,
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
 	.apdma_sync = 0,
+	.max_dma_support = 32,
 };
 
 static const struct mtk_i2c_compatible mt8173_compat = {
@@ -366,11 +366,11 @@ struct i2c_spec_values {
 	.dcm = 1,
 	.auto_restart = 1,
 	.aux_len_reg = 1,
-	.support_33bits = 1,
 	.timing_adjust = 0,
 	.dma_sync = 0,
 	.ltiming_adjust = 0,
 	.apdma_sync = 0,
+	.max_dma_support = 33,
 };
 
 static const struct mtk_i2c_compatible mt8183_compat = {
@@ -380,11 +380,11 @@ struct i2c_spec_values {
 	.dcm = 0,
 	.auto_restart = 1,
 	.aux_len_reg = 1,
-	.support_33bits = 1,
 	.timing_adjust = 1,
 	.dma_sync = 1,
 	.ltiming_adjust = 1,
 	.apdma_sync = 0,
+	.max_dma_support = 33,
 };
 
 static const struct of_device_id mtk_i2c_of_match[] = {
@@ -796,11 +796,6 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
 	return 0;
 }
 
-static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
-{
-	return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;
-}
-
 static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 			       int num, int left_num)
 {
@@ -885,8 +880,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 			return -ENOMEM;
 		}
 
-		if (i2c->dev_comp->support_33bits) {
-			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(rpaddr);
 			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
 		}
 
@@ -908,8 +903,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 			return -ENOMEM;
 		}
 
-		if (i2c->dev_comp->support_33bits) {
-			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(wpaddr);
 			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
 		}
 
@@ -954,11 +949,11 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
 			return -ENOMEM;
 		}
 
-		if (i2c->dev_comp->support_33bits) {
-			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
+		if (i2c->dev_comp->max_dma_support > 32) {
+			reg_4g_mode = upper_32_bits(wpaddr);
 			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
 
-			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
+			reg_4g_mode = upper_32_bits(rpaddr);
 			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
 		}
 
@@ -1232,8 +1227,9 @@ static int mtk_i2c_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	if (i2c->dev_comp->support_33bits) {
-		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33));
+	if (i2c->dev_comp->max_dma_support > 32) {
+		ret = dma_set_mask(&pdev->dev,
+				DMA_BIT_MASK(i2c->dev_comp->max_dma_support));
 		if (ret) {
 			dev_err(&pdev->dev, "dma_set_mask return error.\n");
 			return ret;
-- 
1.9.1

[PATCH v2 3/4] dt-bindings: i2c: update bindings for MT8192 SoC

[Qii Wang]

Add a DT binding documentation for the MT8192 soc.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Qii Wang <qii.wang@mediatek.com>
---
 Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
index 88b71c1..7f0194f 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
@@ -14,6 +14,7 @@ Required properties:
       "mediatek,mt7629-i2c", "mediatek,mt2712-i2c": for MediaTek MT7629
       "mediatek,mt8173-i2c": for MediaTek MT8173
       "mediatek,mt8183-i2c": for MediaTek MT8183
+      "mediatek,mt8192-i2c": for MediaTek MT8192
       "mediatek,mt8516-i2c", "mediatek,mt2712-i2c": for MediaTek MT8516
   - reg: physical base address of the controller and dma base, length of memory
     mapped region.
-- 
1.9.1

[PATCH v2 4/4] i2c: mediatek: Add i2c compatible for MediaTek MT8192

[Qii Wang]

Add i2c compatible for MT8192. Compare to MT8183 i2c controller,
MT8192 support more then 8GB DMA mode.

Signed-off-by: Qii Wang <qii.wang@mediatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index 49777a6..dbf31eb 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -387,6 +387,20 @@ struct i2c_spec_values {
 	.max_dma_support = 33,
 };
 
+static const struct mtk_i2c_compatible mt8192_compat = {
+	.quirks = &mt8183_i2c_quirks,
+	.regs = mt_i2c_regs_v2,
+	.pmic_i2c = 0,
+	.dcm = 0,
+	.auto_restart = 1,
+	.aux_len_reg = 1,
+	.timing_adjust = 1,
+	.dma_sync = 1,
+	.ltiming_adjust = 1,
+	.apdma_sync = 1,
+	.max_dma_support = 36,
+};
+
 static const struct of_device_id mtk_i2c_of_match[] = {
 	{ .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat },
 	{ .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat },
@@ -394,6 +408,7 @@ struct i2c_spec_values {
 	{ .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat },
 	{ .compatible = "mediatek,mt8173-i2c", .data = &mt8173_compat },
 	{ .compatible = "mediatek,mt8183-i2c", .data = &mt8183_compat },
+	{ .compatible = "mediatek,mt8192-i2c", .data = &mt8192_compat },
 	{}
 };
 MODULE_DEVICE_TABLE(of, mtk_i2c_of_match);
-- 
1.9.1

Re: [PATCH v2 2/4] i2c: mediatek: Add access to more than 8GB dram in i2c driver

[Matthias Brugger]

On 28/07/2020 14:30, Qii Wang wrote:
> Newer MTK chip support more than 8GB of dram. Replace support_33bits
> with more general dma_max_support and remove mtk_i2c_set_4g_mode.
> 
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>
> ---
>   drivers/i2c/busses/i2c-mt65xx.c | 38 +++++++++++++++++---------------------
>   1 file changed, 17 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> index e6b984a..49777a6 100644
> --- a/drivers/i2c/busses/i2c-mt65xx.c
> +++ b/drivers/i2c/busses/i2c-mt65xx.c
> @@ -204,11 +204,11 @@ struct mtk_i2c_compatible {
>   	unsigned char dcm: 1;
>   	unsigned char auto_restart: 1;
>   	unsigned char aux_len_reg: 1;
> -	unsigned char support_33bits: 1;
>   	unsigned char timing_adjust: 1;
>   	unsigned char dma_sync: 1;
>   	unsigned char ltiming_adjust: 1;
>   	unsigned char apdma_sync: 1;
> +	unsigned char max_dma_support;
>   };
>   
>   struct mtk_i2c_ac_timing {
> @@ -311,11 +311,11 @@ struct i2c_spec_values {
>   	.dcm = 1,
>   	.auto_restart = 1,
>   	.aux_len_reg = 1,
> -	.support_33bits = 1,
>   	.timing_adjust = 1,
>   	.dma_sync = 0,
>   	.ltiming_adjust = 0,
>   	.apdma_sync = 0,
> +	.max_dma_support = 33,
>   };
>   
>   static const struct mtk_i2c_compatible mt6577_compat = {
> @@ -325,11 +325,11 @@ struct i2c_spec_values {
>   	.dcm = 1,
>   	.auto_restart = 0,
>   	.aux_len_reg = 0,
> -	.support_33bits = 0,
>   	.timing_adjust = 0,
>   	.dma_sync = 0,
>   	.ltiming_adjust = 0,
>   	.apdma_sync = 0,
> +	.max_dma_support = 32,
>   };
>   
>   static const struct mtk_i2c_compatible mt6589_compat = {
> @@ -339,11 +339,11 @@ struct i2c_spec_values {
>   	.dcm = 0,
>   	.auto_restart = 0,
>   	.aux_len_reg = 0,
> -	.support_33bits = 0,
>   	.timing_adjust = 0,
>   	.dma_sync = 0,
>   	.ltiming_adjust = 0,
>   	.apdma_sync = 0,
> +	.max_dma_support = 32,
>   };
>   
>   static const struct mtk_i2c_compatible mt7622_compat = {
> @@ -353,11 +353,11 @@ struct i2c_spec_values {
>   	.dcm = 1,
>   	.auto_restart = 1,
>   	.aux_len_reg = 1,
> -	.support_33bits = 0,
>   	.timing_adjust = 0,
>   	.dma_sync = 0,
>   	.ltiming_adjust = 0,
>   	.apdma_sync = 0,
> +	.max_dma_support = 32,
>   };
>   
>   static const struct mtk_i2c_compatible mt8173_compat = {
> @@ -366,11 +366,11 @@ struct i2c_spec_values {
>   	.dcm = 1,
>   	.auto_restart = 1,
>   	.aux_len_reg = 1,
> -	.support_33bits = 1,
>   	.timing_adjust = 0,
>   	.dma_sync = 0,
>   	.ltiming_adjust = 0,
>   	.apdma_sync = 0,
> +	.max_dma_support = 33,
>   };
>   
>   static const struct mtk_i2c_compatible mt8183_compat = {
> @@ -380,11 +380,11 @@ struct i2c_spec_values {
>   	.dcm = 0,
>   	.auto_restart = 1,
>   	.aux_len_reg = 1,
> -	.support_33bits = 1,
>   	.timing_adjust = 1,
>   	.dma_sync = 1,
>   	.ltiming_adjust = 1,
>   	.apdma_sync = 0,
> +	.max_dma_support = 33,
>   };
>   
>   static const struct of_device_id mtk_i2c_of_match[] = {
> @@ -796,11 +796,6 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
>   	return 0;
>   }
>   
> -static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
> -{
> -	return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;

I think you missed my comment in the last version:
I2C_DMA_4G_MODE is no longer needed, you can delete it.

Regards,
Matthias

> -}
> -
>   static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
>   			       int num, int left_num)
>   {
> @@ -885,8 +880,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
>   			return -ENOMEM;
>   		}
>   
> -		if (i2c->dev_comp->support_33bits) {
> -			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> +		if (i2c->dev_comp->max_dma_support > 32) {
> +			reg_4g_mode = upper_32_bits(rpaddr);
>   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
>   		}
>   
> @@ -908,8 +903,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
>   			return -ENOMEM;
>   		}
>   
> -		if (i2c->dev_comp->support_33bits) {
> -			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> +		if (i2c->dev_comp->max_dma_support > 32) {
> +			reg_4g_mode = upper_32_bits(wpaddr);
>   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
>   		}
>   
> @@ -954,11 +949,11 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
>   			return -ENOMEM;
>   		}
>   
> -		if (i2c->dev_comp->support_33bits) {
> -			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> +		if (i2c->dev_comp->max_dma_support > 32) {
> +			reg_4g_mode = upper_32_bits(wpaddr);
>   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
>   
> -			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> +			reg_4g_mode = upper_32_bits(rpaddr);
>   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
>   		}
>   
> @@ -1232,8 +1227,9 @@ static int mtk_i2c_probe(struct platform_device *pdev)
>   		return -EINVAL;
>   	}
>   
> -	if (i2c->dev_comp->support_33bits) {
> -		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33));
> +	if (i2c->dev_comp->max_dma_support > 32) {
> +		ret = dma_set_mask(&pdev->dev,
> +				DMA_BIT_MASK(i2c->dev_comp->max_dma_support));
>   		if (ret) {
>   			dev_err(&pdev->dev, "dma_set_mask return error.\n");
>   			return ret;
> 

Re: [PATCH v2 2/4] i2c: mediatek: Add access to more than 8GB dram in i2c driver

[Qii Wang]

On Wed, 2020-07-29 at 09:59 +0200, Matthias Brugger wrote:
> 
> On 28/07/2020 14:30, Qii Wang wrote:
> > Newer MTK chip support more than 8GB of dram. Replace support_33bits
> > with more general dma_max_support and remove mtk_i2c_set_4g_mode.
> > 
> > Signed-off-by: Qii Wang <qii.wang@mediatek.com>
> > ---
> >   drivers/i2c/busses/i2c-mt65xx.c | 38 +++++++++++++++++---------------------
> >   1 file changed, 17 insertions(+), 21 deletions(-)
> > 
> > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> > index e6b984a..49777a6 100644
> > --- a/drivers/i2c/busses/i2c-mt65xx.c
> > +++ b/drivers/i2c/busses/i2c-mt65xx.c
> > @@ -204,11 +204,11 @@ struct mtk_i2c_compatible {
> >   	unsigned char dcm: 1;
> >   	unsigned char auto_restart: 1;
> >   	unsigned char aux_len_reg: 1;
> > -	unsigned char support_33bits: 1;
> >   	unsigned char timing_adjust: 1;
> >   	unsigned char dma_sync: 1;
> >   	unsigned char ltiming_adjust: 1;
> >   	unsigned char apdma_sync: 1;
> > +	unsigned char max_dma_support;
> >   };
> >   
> >   struct mtk_i2c_ac_timing {
> > @@ -311,11 +311,11 @@ struct i2c_spec_values {
> >   	.dcm = 1,
> >   	.auto_restart = 1,
> >   	.aux_len_reg = 1,
> > -	.support_33bits = 1,
> >   	.timing_adjust = 1,
> >   	.dma_sync = 0,
> >   	.ltiming_adjust = 0,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 33,
> >   };
> >   
> >   static const struct mtk_i2c_compatible mt6577_compat = {
> > @@ -325,11 +325,11 @@ struct i2c_spec_values {
> >   	.dcm = 1,
> >   	.auto_restart = 0,
> >   	.aux_len_reg = 0,
> > -	.support_33bits = 0,
> >   	.timing_adjust = 0,
> >   	.dma_sync = 0,
> >   	.ltiming_adjust = 0,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 32,
> >   };
> >   
> >   static const struct mtk_i2c_compatible mt6589_compat = {
> > @@ -339,11 +339,11 @@ struct i2c_spec_values {
> >   	.dcm = 0,
> >   	.auto_restart = 0,
> >   	.aux_len_reg = 0,
> > -	.support_33bits = 0,
> >   	.timing_adjust = 0,
> >   	.dma_sync = 0,
> >   	.ltiming_adjust = 0,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 32,
> >   };
> >   
> >   static const struct mtk_i2c_compatible mt7622_compat = {
> > @@ -353,11 +353,11 @@ struct i2c_spec_values {
> >   	.dcm = 1,
> >   	.auto_restart = 1,
> >   	.aux_len_reg = 1,
> > -	.support_33bits = 0,
> >   	.timing_adjust = 0,
> >   	.dma_sync = 0,
> >   	.ltiming_adjust = 0,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 32,
> >   };
> >   
> >   static const struct mtk_i2c_compatible mt8173_compat = {
> > @@ -366,11 +366,11 @@ struct i2c_spec_values {
> >   	.dcm = 1,
> >   	.auto_restart = 1,
> >   	.aux_len_reg = 1,
> > -	.support_33bits = 1,
> >   	.timing_adjust = 0,
> >   	.dma_sync = 0,
> >   	.ltiming_adjust = 0,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 33,
> >   };
> >   
> >   static const struct mtk_i2c_compatible mt8183_compat = {
> > @@ -380,11 +380,11 @@ struct i2c_spec_values {
> >   	.dcm = 0,
> >   	.auto_restart = 1,
> >   	.aux_len_reg = 1,
> > -	.support_33bits = 1,
> >   	.timing_adjust = 1,
> >   	.dma_sync = 1,
> >   	.ltiming_adjust = 1,
> >   	.apdma_sync = 0,
> > +	.max_dma_support = 33,
> >   };
> >   
> >   static const struct of_device_id mtk_i2c_of_match[] = {
> > @@ -796,11 +796,6 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
> >   	return 0;
> >   }
> >   
> > -static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
> > -{
> > -	return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;
> 
> I think you missed my comment in the last version:
> I2C_DMA_4G_MODE is no longer needed, you can delete it.
> 
> Regards,
> Matthias
> 

Sorry for missing that comment, I will remove it.
Thank you for your comments and reminders.

> > -}
> > -
> >   static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> >   			       int num, int left_num)
> >   {
> > @@ -885,8 +880,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> >   			return -ENOMEM;
> >   		}
> >   
> > -		if (i2c->dev_comp->support_33bits) {
> > -			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> > +		if (i2c->dev_comp->max_dma_support > 32) {
> > +			reg_4g_mode = upper_32_bits(rpaddr);
> >   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
> >   		}
> >   
> > @@ -908,8 +903,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> >   			return -ENOMEM;
> >   		}
> >   
> > -		if (i2c->dev_comp->support_33bits) {
> > -			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> > +		if (i2c->dev_comp->max_dma_support > 32) {
> > +			reg_4g_mode = upper_32_bits(wpaddr);
> >   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
> >   		}
> >   
> > @@ -954,11 +949,11 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
> >   			return -ENOMEM;
> >   		}
> >   
> > -		if (i2c->dev_comp->support_33bits) {
> > -			reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
> > +		if (i2c->dev_comp->max_dma_support > 32) {
> > +			reg_4g_mode = upper_32_bits(wpaddr);
> >   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
> >   
> > -			reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
> > +			reg_4g_mode = upper_32_bits(rpaddr);
> >   			writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
> >   		}
> >   
> > @@ -1232,8 +1227,9 @@ static int mtk_i2c_probe(struct platform_device *pdev)
> >   		return -EINVAL;
> >   	}
> >   
> > -	if (i2c->dev_comp->support_33bits) {
> > -		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33));
> > +	if (i2c->dev_comp->max_dma_support > 32) {
> > +		ret = dma_set_mask(&pdev->dev,
> > +				DMA_BIT_MASK(i2c->dev_comp->max_dma_support));
> >   		if (ret) {
> >   			dev_err(&pdev->dev, "dma_set_mask return error.\n");
> >   			return ret;
> > 

Re: [PATCH v2 2/4] i2c: mediatek: Add access to more than 8GB dram in i2c driver

[Yingjoe Chen]

On Tue, 2020-07-28 at 20:30 +0800, Qii Wang wrote:
> Newer MTK chip support more than 8GB of dram. Replace support_33bits
> with more general dma_max_support and remove mtk_i2c_set_4g_mode.
> 
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>

Qii,

After you remove I2C_DMA_4G_MODE Matthias mentioned, you can have:

Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>

Joe.C

Re: [PATCH v2 2/4] i2c: mediatek: Add access to more than 8GB dram in i2c driver

[wsa]

[-- Attachment #1: Type: text/plain, Size: 537 bytes --]


> > > -static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
> > > -{
> > > -	return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;
> > 
> > I think you missed my comment in the last version:
> > I2C_DMA_4G_MODE is no longer needed, you can delete it.
> > 
> > Regards,
> > Matthias
> > 
> 
> Sorry for missing that comment, I will remove it.
> Thank you for your comments and reminders.

If you send it real soon, I can still include it for 5.9.

(and please guys, shorten mails to the relevant parts)


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]