Re: [RFC PATCH v2 08/12] mtd: rawnand: ams-delta: Simplify pointer resolution on read/write

Boris Brezillon
2018-08-07T17:03:46Z

On Tue, 7 Aug 2018 00:29:14 +0200
Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:

> Simplify data read/write sub-functions by changing their APIs so they
> accept driver private structure pointer instead of mtd_info.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>

Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>

Can you move that one earlier in the series so that it can be applied
even if we're still discussing the GPIO bitmap changes?

> ---
> drivers/mtd/nand/raw/ams-delta.c | 40 ++++++++++++++++++++++------------------
> 1 file changed, 22 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/ams-delta.c b/drivers/mtd/nand/raw/ams-delta.c
> index d02c48c013e8..30c461138195 100644
> --- a/drivers/mtd/nand/raw/ams-delta.c
> +++ b/drivers/mtd/nand/raw/ams-delta.c
> @@ -76,10 +76,8 @@ static void ams_delta_write_commit(struct ams_delta_nand *priv)
> gpiod_set_value(priv->gpiod_nwe, 1);
> }
>
> -static void ams_delta_write_next_byte(struct mtd_info *mtd, u_char byte)
> +static void ams_delta_write_next_byte(struct ams_delta_nand *priv, u_char byte)
> {
> - struct nand_chip *this = mtd_to_nand(mtd);
> - struct ams_delta_nand *priv = nand_get_controller_data(this);
> struct gpio_descs *data_gpiods = priv->data_gpiods;
> unsigned long bits = byte;
> int i, value_array[data_gpiods->ndescs];
> @@ -93,10 +91,8 @@ static void ams_delta_write_next_byte(struct mtd_info *mtd, u_char byte)
> ams_delta_write_commit(priv);
> }
>
> -static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
> +static void ams_delta_write_first_byte(struct ams_delta_nand *priv, u_char byte)
> {
> - struct nand_chip *this = mtd_to_nand(mtd);
> - struct ams_delta_nand *priv = nand_get_controller_data(this);
> struct gpio_descs *data_gpiods = priv->data_gpiods;
> unsigned long bits = byte;
> int i;
> @@ -108,10 +104,8 @@ static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
> ams_delta_write_commit(priv);
> }
>
> -static u_char ams_delta_read_next_byte(struct mtd_info *mtd)
> +static u_char ams_delta_read_next_byte(struct ams_delta_nand *priv)
> {
> - struct nand_chip *this = mtd_to_nand(mtd);
> - struct ams_delta_nand *priv = nand_get_controller_data(this);
> struct gpio_descs *data_gpiods = priv->data_gpiods;
> unsigned long bits = 0;
> int i, value_array[data_gpiods->ndescs];
> @@ -131,38 +125,48 @@ static u_char ams_delta_read_next_byte(struct mtd_info *mtd)
> return bits;
> }
>
> -static u_char ams_delta_read_byte(struct mtd_info *mtd)
> +static u_char ams_delta_read_first_byte(struct ams_delta_nand *priv)
> {
> - struct nand_chip *this = mtd_to_nand(mtd);
> - struct ams_delta_nand *priv = nand_get_controller_data(this);
> struct gpio_descs *data_gpiods = priv->data_gpiods;
> int i;
>
> for (i = 0; i < data_gpiods->ndescs; i++)
> gpiod_direction_input(data_gpiods->desc[i]);
>
> - return ams_delta_read_next_byte(mtd);
> + return ams_delta_read_next_byte(priv);
> +}
> +
> +static u_char ams_delta_read_byte(struct mtd_info *mtd)
> +{
> + struct nand_chip *this = mtd_to_nand(mtd);
> + struct ams_delta_nand *priv = nand_get_controller_data(this);
> +
> + return ams_delta_read_first_byte(priv);
> }
>
> static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf,
> int len)
> {
> + struct nand_chip *this = mtd_to_nand(mtd);
> + struct ams_delta_nand *priv = nand_get_controller_data(this);
> int i;
>
> if (len > 0)
> - ams_delta_write_byte(mtd, buf[0]);
> + ams_delta_write_first_byte(priv, buf[0]);
> for (i = 1; i < len; i++)
> - ams_delta_write_next_byte(mtd, buf[i]);
> + ams_delta_write_next_byte(priv, buf[i]);
> }
>
> static void ams_delta_read_buf(struct mtd_info *mtd, u_char *buf, int len)
> {
> + struct nand_chip *this = mtd_to_nand(mtd);
> + struct ams_delta_nand *priv = nand_get_controller_data(this);
> int i;
>
> if (len > 0)
> - buf[0] = ams_delta_read_byte(mtd);
> + buf[0] = ams_delta_read_first_byte(priv);
> for (i = 1; i < len; i++)
> - buf[i] = ams_delta_read_next_byte(mtd);
> + buf[i] = ams_delta_read_next_byte(priv);
> }
>
> /*
> @@ -186,7 +190,7 @@ static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,
> }
>
> if (cmd != NAND_CMD_NONE)
> - ams_delta_write_byte(mtd, cmd);
> + ams_delta_write_first_byte(priv, cmd);
> }
>
> static int ams_delta_nand_ready(struct mtd_info *mtd)