[PATCH v1 02/11] spi: dw: update NDF while using enhanced spi mode

[Changhuang Liang <changhuang.liang@starfivetech.com>]

From: Sudip Mukherjee <sudip.mukherjee@sifive.com>

If the transfer of Transmit only mode is using dual/quad/octal SPI then
NDF needs to be updated with the number of data frames.
If the Transmit FIFO goes empty in-between, DWC_ssi masks the serial
clock and wait for rest of the data until the programmed amount of
frames are transferred successfully.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 drivers/spi/spi-dw-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 86e3e7487bc7..bd41e1b4dba7 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -348,6 +348,9 @@ void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
 	if (cfg->tmode == DW_SPI_CTRLR0_TMOD_EPROMREAD ||
 	    cfg->tmode == DW_SPI_CTRLR0_TMOD_RO)
 		dw_writel(dws, DW_SPI_CTRLR1, cfg->ndf ? cfg->ndf - 1 : 0);
+	else if (cfg->tmode == DW_SPI_CTRLR0_TMOD_TO &&
+		 dws->caps & DW_SPI_CAP_EMODE)
+		dw_writel(dws, DW_SPI_CTRLR1, cfg->ndf);
 
 	/* Note DW APB SSI clock divider doesn't support odd numbers */
 	clk_div = (DIV_ROUND_UP(dws->max_freq, cfg->freq) + 1) & 0xfffe;
-- 
2.25.1