2022-12-29 11:03:00

by Ivan Bornyakov

Subject: [PATCH v4 3/3] fpga: microchip-spi: separate data frame write routine

mpf_ops_write() function writes bitstream data to the FPGA by a smaller
frames. Introduce mpf_spi_frame_write() function which is for writing a
single data frame and use it in mpf_ops_write().

No functional changes intended.

Signed-off-by: Ivan Bornyakov <[email protected]>
Acked-by: Conor Dooley <[email protected]>
---
drivers/fpga/microchip-spi.c | 36 +++++++++++++++++++++++-------------
1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
index 995b1964e0fe..8a541986f6f2 100644
--- a/drivers/fpga/microchip-spi.c
+++ b/drivers/fpga/microchip-spi.c
@@ -280,9 +280,30 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
return 0;
}

+static int mpf_spi_frame_write(struct mpf_priv *priv, const char *buf)
+{
+ struct spi_transfer xfers[2] = {
+ {
+ .tx_buf = &priv->tx,
+ .len = 1,
+ }, {
+ .tx_buf = buf,
+ .len = MPF_SPI_FRAME_SIZE,
+ },
+ };
+ int ret;
+
+ ret = mpf_poll_status(priv, 0);
+ if (ret < 0)
+ return ret;
+
+ priv->tx = MPF_SPI_FRAME;
+
+ return spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
+}
+
static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
{
- struct spi_transfer xfers[2] = { 0 };
struct mpf_priv *priv = mgr->priv;
struct device *dev = &mgr->dev;
int ret, i;
@@ -293,19 +314,8 @@ static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count
return -EINVAL;
}

- xfers[0].tx_buf = &priv->tx;
- xfers[0].len = 1;
-
for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
- xfers[1].tx_buf = buf + i * MPF_SPI_FRAME_SIZE;
- xfers[1].len = MPF_SPI_FRAME_SIZE;
-
- ret = mpf_poll_status(priv, 0);
- if (ret >= 0) {
- priv->tx = MPF_SPI_FRAME;
- ret = spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
- }
-
+ ret = mpf_spi_frame_write(priv, buf + i * MPF_SPI_FRAME_SIZE);
if (ret) {
dev_err(dev, "Failed to write bitstream frame %d/%zu\n",
i, count / MPF_SPI_FRAME_SIZE);
--
2.39.0

2022-12-30 08:47:43

by Xu Yilun

Subject: Re: [PATCH v4 3/3] fpga: microchip-spi: separate data frame write routine

On 2022-12-29 at 13:46:04 +0300, Ivan Bornyakov wrote:
> mpf_ops_write() function writes bitstream data to the FPGA by a smaller
> frames. Introduce mpf_spi_frame_write() function which is for writing a
> single data frame and use it in mpf_ops_write().
>
> No functional changes intended.
>
> Signed-off-by: Ivan Bornyakov <[email protected]>
> Acked-by: Conor Dooley <[email protected]>

Acked-by: Xu Yilun <[email protected]>

> ---
> drivers/fpga/microchip-spi.c | 36 +++++++++++++++++++++++-------------
> 1 file changed, 23 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/fpga/microchip-spi.c b/drivers/fpga/microchip-spi.c
> index 995b1964e0fe..8a541986f6f2 100644
> --- a/drivers/fpga/microchip-spi.c
> +++ b/drivers/fpga/microchip-spi.c
> @@ -280,9 +280,30 @@ static int mpf_ops_write_init(struct fpga_manager *mgr,
> return 0;
> }
>
> +static int mpf_spi_frame_write(struct mpf_priv *priv, const char *buf)
> +{
> + struct spi_transfer xfers[2] = {
> + {
> + .tx_buf = &priv->tx,
> + .len = 1,
> + }, {
> + .tx_buf = buf,
> + .len = MPF_SPI_FRAME_SIZE,
> + },
> + };
> + int ret;
> +
> + ret = mpf_poll_status(priv, 0);
> + if (ret < 0)
> + return ret;
> +
> + priv->tx = MPF_SPI_FRAME;
> +
> + return spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
> +}
> +
> static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count)
> {
> - struct spi_transfer xfers[2] = { 0 };
> struct mpf_priv *priv = mgr->priv;
> struct device *dev = &mgr->dev;
> int ret, i;
> @@ -293,19 +314,8 @@ static int mpf_ops_write(struct fpga_manager *mgr, const char *buf, size_t count
> return -EINVAL;
> }
>
> - xfers[0].tx_buf = &priv->tx;
> - xfers[0].len = 1;
> -
> for (i = 0; i < count / MPF_SPI_FRAME_SIZE; i++) {
> - xfers[1].tx_buf = buf + i * MPF_SPI_FRAME_SIZE;
> - xfers[1].len = MPF_SPI_FRAME_SIZE;
> -
> - ret = mpf_poll_status(priv, 0);
> - if (ret >= 0) {
> - priv->tx = MPF_SPI_FRAME;
> - ret = spi_sync_transfer(priv->spi, xfers, ARRAY_SIZE(xfers));
> - }
> -
> + ret = mpf_spi_frame_write(priv, buf + i * MPF_SPI_FRAME_SIZE);
> if (ret) {
> dev_err(dev, "Failed to write bitstream frame %d/%zu\n",
> i, count / MPF_SPI_FRAME_SIZE);
> --
> 2.39.0
>
>