[PATCH 2/7] drm/panel: sitronix-st7789v: Use 9 bits per spi word by default

[Miquel Raynal]

The Sitronix controller expects 9-bit words, provide this as default at
probe time rather than specifying this in each and every access.

Signed-off-by: Miquel Raynal <miquel.ray...@bootlin.com>
---
 drivers/gpu/drm/panel/panel-sitronix-st7789v.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c 
b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index c67b9adb157f..e9ca7ebb458a 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -138,7 +138,6 @@ static int st7789v_spi_write(struct st7789v *ctx, enum 
st7789v_prefix prefix,
        spi_message_init(&msg);
 
        xfer.tx_buf = &txbuf;
-       xfer.bits_per_word = 9;
        xfer.len = sizeof(txbuf);
 
        spi_message_add_tail(&xfer, &msg);
@@ -365,6 +364,13 @@ static int st7789v_probe(struct spi_device *spi)
        spi_set_drvdata(spi, ctx);
        ctx->spi = spi;
 
+       spi->bits_per_word = 9;
+       ret = spi_setup(spi);
+       if (ret < 0) {
+               dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
+               return ret;
+       }
+
        drm_panel_init(&ctx->panel, &spi->dev, &st7789v_drm_funcs,
                       DRM_MODE_CONNECTOR_DPI);
 
-- 
2.34.1