linux-kernel - Re: [PATCH v5 4/5] i2c: mediatek: Add i2c and apdma sync in i2c driver

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Date:   Wed, 6 Mar 2019 18:44:58 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Qii Wang <qii.wang@...iatek.com>
Cc:     wsa@...-dreams.de, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Leilk Liu <leilk.liu@...iatek.com>, xinping.qian@...iatek.com,
        liguo.zhang@...iatek.com, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v5 4/5] i2c: mediatek: Add i2c and apdma sync in i2c driver

On Tue, Feb 26, 2019 at 9:11 PM Qii Wang <qii.wang@...iatek.com> wrote:
>
> When i2c and apdma use different source clocks, we should enable
> synchronization between them.
>
> Signed-off-by: Qii Wang <qii.wang@...iatek.com>

Reviewed-by: Nicolas Boichat <drinkcat@...omium.org>

> ---
>  drivers/i2c/busses/i2c-mt65xx.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> index 14d6b38..75d88e1 100644
> --- a/drivers/i2c/busses/i2c-mt65xx.c
> +++ b/drivers/i2c/busses/i2c-mt65xx.c
> @@ -77,6 +77,8 @@
>  #define I2C_CONTROL_DIR_CHANGE          (0x1 << 4)
>  #define I2C_CONTROL_ACKERR_DET_EN       (0x1 << 5)
>  #define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6)
> +#define I2C_CONTROL_DMAACK_EN           (0x1 << 8)
> +#define I2C_CONTROL_ASYNC_MODE          (0x1 << 9)
>  #define I2C_CONTROL_WRAPPER             (0x1 << 0)
>
>  #define I2C_DRV_NAME           "i2c-mt65xx"
> @@ -169,6 +171,7 @@ struct mtk_i2c_compatible {
>         unsigned char aux_len_reg: 1;
>         unsigned char support_33bits: 1;
>         unsigned char timing_adjust: 1;
> +       unsigned char dma_sync: 1;
>  };
>
>  struct mtk_i2c {
> @@ -218,6 +221,7 @@ struct mtk_i2c {
>         .aux_len_reg = 1,
>         .support_33bits = 1,
>         .timing_adjust = 1,
> +       .dma_sync = 0,
>  };
>
>  static const struct mtk_i2c_compatible mt6577_compat = {
> @@ -229,6 +233,7 @@ struct mtk_i2c {
>         .aux_len_reg = 0,
>         .support_33bits = 0,
>         .timing_adjust = 0,
> +       .dma_sync = 0,
>  };
>
>  static const struct mtk_i2c_compatible mt6589_compat = {
> @@ -240,6 +245,7 @@ struct mtk_i2c {
>         .aux_len_reg = 0,
>         .support_33bits = 0,
>         .timing_adjust = 0,
> +       .dma_sync = 0,
>  };
>
>  static const struct mtk_i2c_compatible mt7622_compat = {
> @@ -251,6 +257,7 @@ struct mtk_i2c {
>         .aux_len_reg = 1,
>         .support_33bits = 0,
>         .timing_adjust = 0,
> +       .dma_sync = 0,
>  };
>
>  static const struct mtk_i2c_compatible mt8173_compat = {
> @@ -261,6 +268,7 @@ struct mtk_i2c {
>         .aux_len_reg = 1,
>         .support_33bits = 1,
>         .timing_adjust = 0,
> +       .dma_sync = 0,
>  };
>
>  static const struct of_device_id mtk_i2c_of_match[] = {
> @@ -360,6 +368,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
>
>         control_reg = I2C_CONTROL_ACKERR_DET_EN |
>                       I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN;
> +       if (i2c->dev_comp->dma_sync)
> +               control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE;
> +
>         mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);
>         mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN);
>
> --
> 1.7.9.5
>