[PATCH v1 1/1] spi: pxa2xx: Remove redundant ->read() and ->write() in struct chip_data

[PATCH v1 1/1] spi: pxa2xx: Remove redundant ->read() and ->write() in struct chip_data

[Andy Shevchenko]

Since the commit 196b0e2cf237 ("spi: pxa2xx: Remove if statement
that is always true in pump_transfers()") the ->read() and ->write()
methods in the struct driver_data are reconfigured for each transfer.
Hence no need to keep the intermediate state in the struct chip_data.

The same applies to n_bytes member of the same data structure.
Get rid of unneeded storage for good.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 35 ++++++-----------------------------
 drivers/spi/spi-pxa2xx.h |  4 ----
 2 files changed, 6 insertions(+), 33 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 1573f6d8eb48..ee3297dd532e 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -994,13 +994,10 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 		dev_err(&spi->dev, "Flush failed\n");
 		return -EIO;
 	}
-	drv_data->n_bytes = chip->n_bytes;
 	drv_data->tx = (void *)transfer->tx_buf;
 	drv_data->tx_end = drv_data->tx + transfer->len;
 	drv_data->rx = transfer->rx_buf;
 	drv_data->rx_end = drv_data->rx + transfer->len;
-	drv_data->write = drv_data->tx ? chip->write : null_writer;
-	drv_data->read = drv_data->rx ? chip->read : null_reader;
 
 	/* Change speed and bit per word on a per transfer */
 	bits = transfer->bits_per_word;
@@ -1010,22 +1007,16 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
 
 	if (bits <= 8) {
 		drv_data->n_bytes = 1;
-		drv_data->read = drv_data->read != null_reader ?
-					u8_reader : null_reader;
-		drv_data->write = drv_data->write != null_writer ?
-					u8_writer : null_writer;
+		drv_data->read = drv_data->rx ? u8_reader : null_reader;
+		drv_data->write = drv_data->tx ? u8_writer : null_writer;
 	} else if (bits <= 16) {
 		drv_data->n_bytes = 2;
-		drv_data->read = drv_data->read != null_reader ?
-					u16_reader : null_reader;
-		drv_data->write = drv_data->write != null_writer ?
-					u16_writer : null_writer;
+		drv_data->read = drv_data->rx ? u16_reader : null_reader;
+		drv_data->write = drv_data->tx ? u16_writer : null_writer;
 	} else if (bits <= 32) {
 		drv_data->n_bytes = 4;
-		drv_data->read = drv_data->read != null_reader ?
-					u32_reader : null_reader;
-		drv_data->write = drv_data->write != null_writer ?
-					u32_writer : null_writer;
+		drv_data->read = drv_data->rx ? u32_reader : null_reader;
+		drv_data->write = drv_data->tx ? u32_writer : null_writer;
 	}
 	/*
 	 * If bits per word is changed in DMA mode, then must check
@@ -1391,20 +1382,6 @@ static int setup(struct spi_device *spi)
 	if (spi->mode & SPI_LOOP)
 		chip->cr1 |= SSCR1_LBM;
 
-	if (spi->bits_per_word <= 8) {
-		chip->n_bytes = 1;
-		chip->read = u8_reader;
-		chip->write = u8_writer;
-	} else if (spi->bits_per_word <= 16) {
-		chip->n_bytes = 2;
-		chip->read = u16_reader;
-		chip->write = u16_writer;
-	} else if (spi->bits_per_word <= 32) {
-		chip->n_bytes = 4;
-		chip->read = u32_reader;
-		chip->write = u32_writer;
-	}
-
 	spi_set_ctldata(spi, chip);
 
 	if (drv_data->ssp_type == CE4100_SSP)
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 9a20fb88e50f..4d77f4de6eda 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -61,7 +61,6 @@ struct chip_data {
 	u32 cr1;
 	u32 dds_rate;
 	u32 timeout;
-	u8 n_bytes;
 	u8 enable_dma;
 	u32 dma_burst_size;
 	u32 dma_threshold;
@@ -69,9 +68,6 @@ struct chip_data {
 	u16 lpss_rx_threshold;
 	u16 lpss_tx_threshold;
 
-	int (*write)(struct driver_data *drv_data);
-	int (*read)(struct driver_data *drv_data);
-
 	void (*cs_control)(u32 command);
 };
 
-- 
2.33.0

Re: [PATCH v1 1/1] spi: pxa2xx: Remove redundant ->read() and ->write() in struct chip_data

[Mark Brown]

On Mon, 22 Nov 2021 22:06:22 +0200, Andy Shevchenko wrote:
> Since the commit 196b0e2cf237 ("spi: pxa2xx: Remove if statement
> that is always true in pump_transfers()") the ->read() and ->write()
> methods in the struct driver_data are reconfigured for each transfer.
> Hence no need to keep the intermediate state in the struct chip_data.
> 
> The same applies to n_bytes member of the same data structure.
> Get rid of unneeded storage for good.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: pxa2xx: Remove redundant ->read() and ->write() in struct chip_data
      commit: 44ec41b7f7831f91c79a06de5e45f2d7ce6e4fbd

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark