From: Matthias Brugger <matthias.bgg@gmail.com>
To: Qii Wang <qii.wang@mediatek.com>, wsa@the-dreams.de
Cc: qiangming.xia@mediatek.com, devicetree@vger.kernel.org,
srv_heupstream@mediatek.com, leilk.liu@mediatek.com,
linux-kernel@vger.kernel.org, robh+dt@kernel.org,
linux-mediatek@lists.infradead.org, linux-i2c@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/4] i2c: mediatek: Add apdma sync in i2c driver
Date: Wed, 22 Jul 2020 17:26:42 +0200 [thread overview]
Message-ID: <58e23057-d84c-7fc2-e912-6569cbbf1b25@gmail.com> (raw)
In-Reply-To: <1595421106-10017-2-git-send-email-qii.wang@mediatek.com>
On 22/07/2020 14:31, Qii Wang wrote:
> With the apdma remove hand-shake signal, it need to keep i2c and
> apdma in sync manually.
>
> Signed-off-by: Qii Wang <qii.wang@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.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)
>
next prev parent reply other threads:[~2020-07-22 15:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 12:31 [PATCH 0/4] add i2c support for mt8192 Qii Wang
2020-07-22 12:31 ` [PATCH 1/4] i2c: mediatek: Add apdma sync in i2c driver Qii Wang
2020-07-22 15:26 ` Matthias Brugger [this message]
2020-07-23 1:29 ` Yingjoe Chen
2020-07-23 6:01 ` Qii Wang
2020-07-22 12:31 ` [PATCH 2/4] i2c: mediatek: Support DMA mask range over 33-bits Qii Wang
2020-07-22 15:38 ` Matthias Brugger
2020-07-23 5:47 ` Qii Wang
2020-07-23 1:24 ` Yingjoe Chen
2020-07-23 6:03 ` Qii Wang
2020-07-22 12:31 ` [PATCH 3/4] dt-bindings: i2c: update bindings for MT8192 SoC Qii Wang
2020-07-23 21:18 ` Rob Herring
2020-07-22 12:31 ` [PATCH 4/4] i2c: mediatek: Add i2c compatible for MediaTek MT8192 Qii Wang
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