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

From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Sam Ravnborg <sam@ravnborg.org>, David Airlie <airlied@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Maxime Ripard <mripard@kernel.org>,
	dri-devel@lists.freedesktop.org
Cc: devicetree@vger.kernel.org,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH 2/7] drm/panel: sitronix-st7789v: Use 9 bits per spi word by default
Date: Fri,  9 Jun 2023 16:59:46 +0200	[thread overview]
Message-ID: <20230609145951.853533-3-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20230609145951.853533-1-miquel.raynal@bootlin.com>

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.raynal@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

