1 files changed, 12 insertions, 16 deletions

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index ac2eb89ef7a5..b705f2bdb8b9 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -144,6 +144,8 @@ void dw_spi_set_cs(struct spi_device *spi, bool enable)
 
 	if (!enable)
 		dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select));
+	else if (dws->cs_override)
+		dw_writel(dws, DW_SPI_SER, 0);
 }
 EXPORT_SYMBOL_GPL(dw_spi_set_cs);
 
@@ -308,15 +310,10 @@ static int dw_spi_transfer_one(struct spi_controller *master,
 		dws->current_freq = transfer->speed_hz;
 		spi_set_clk(dws, chip->clk_div);
 	}
-	if (transfer->bits_per_word == 8) {
-		dws->n_bytes = 1;
-		dws->dma_width = 1;
-	} else if (transfer->bits_per_word == 16) {
-		dws->n_bytes = 2;
-		dws->dma_width = 2;
-	} else {
-		return -EINVAL;
-	}
+
+	dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
+	dws->dma_width = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE);
+
 	/* Default SPI mode is SCPOL = 0, SCPH = 0 */
 	cr0 = (transfer->bits_per_word - 1)
 		| (chip->type << SPI_FRF_OFFSET)
@@ -468,6 +465,10 @@ static void spi_hw_init(struct device *dev, struct dw_spi *dws)
 		dws->fifo_len = (fifo == 1) ? 0 : fifo;
 		dev_dbg(dev, "Detected FIFO size: %u bytes\n", dws->fifo_len);
 	}
+
+	/* enable HW fixup for explicit CS deselect for Amazon's alpine chip */
+	if (dws->cs_override)
+		dw_writel(dws, DW_SPI_CS_OVERRIDE, 0xF);
 }
 
 int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
@@ -496,7 +497,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	}
 
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
-	master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
+	master->bits_per_word_mask =  SPI_BPW_RANGE_MASK(4, 16);
 	master->bus_num = dws->bus_num;
 	master->num_chipselect = dws->num_cs;
 	master->setup = dw_spi_setup;
@@ -572,13 +573,8 @@ EXPORT_SYMBOL_GPL(dw_spi_suspend_host);
 
 int dw_spi_resume_host(struct dw_spi *dws)
 {
-	int ret;
-
 	spi_hw_init(&dws->master->dev, dws);
-	ret = spi_controller_resume(dws->master);
-	if (ret)
-		dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret);
-	return ret;
+	return spi_controller_resume(dws->master);
 }
 EXPORT_SYMBOL_GPL(dw_spi_resume_host);