[PATCH v2 03/12] drm/bridge: tc358762: Improve LCDCTRL defines

[Tomi Valkeinen]

LCDCTRL fields are quite wrong in the driver. Fix the field defines.

A few notes about the wrong fields:

LCDCTRL_VSDELAY(1) actually sets LCDCTRL_DCLK_POL
LCDCTRL_UNK6 | LCDCTRL_VTGEN actually set LCDCTRL_PXLFORM_RGB888
LCDCTRL_RGB888 actually sets LCDCTRL_DPI_EN

The total still resulted in a working display even if the defines were
quite wrong.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/tc358762.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358762.c b/drivers/gpu/drm/bridge/tc358762.c
index 9a0b1f0c18f0..cbedffb7a705 100644
--- a/drivers/gpu/drm/bridge/tc358762.c
+++ b/drivers/gpu/drm/bridge/tc358762.c
@@ -46,17 +46,22 @@
 #define DSI_LANEENABLE_L0EN	BIT(1)
 #define DSI_LANEENABLE_L1EN	BIT(2)
 
-/* LCDC/DPI Host Registers, based on guesswork that this matches TC358764 */
+/* LCDC/DPI Registers */
 #define LCDCTRL			0x0420 /* Video Path Control */
 #define LCDCTRL_MSF		BIT(0) /* Magic square in RGB666 */
-#define LCDCTRL_VTGEN		BIT(4)/* Use chip clock for timing */
-#define LCDCTRL_UNK6		BIT(6) /* Unknown */
-#define LCDCTRL_EVTMODE		BIT(5) /* Event mode */
-#define LCDCTRL_RGB888		BIT(8) /* RGB888 mode */
-#define LCDCTRL_HSPOL		BIT(17) /* Polarity of HSYNC signal */
-#define LCDCTRL_DEPOL		BIT(18) /* Polarity of DE signal */
-#define LCDCTRL_VSPOL		BIT(19) /* Polarity of VSYNC signal */
-#define LCDCTRL_VSDELAY(v)	(((v) & 0xfff) << 20) /* VSYNC delay */
+#define LCDCTRL_VTGEN		BIT(1) /* Use chip clock for timing */
+#define LCDCTRL_PXLFORM		GENMASK_U32(6, 4)
+#define LCDCTRL_PXLFORM_RGB666		0	/* x:R:G:B 6:8:8:8 */
+#define LCDCTRL_PXLFORM_RGB666_24	1	/* x:R:x:G:x:B 2:6:2:6:2:6 */
+#define LCDCTRL_PXLFORM_RGB565		2	/* x:R:G:B 8:5:6:5 */
+#define LCDCTRL_PXLFORM_RGB565_1	3	/* x:R:x:G:x:B 3:5:2:6:3:5 */
+#define LCDCTRL_PXLFORM_RGB565_2	4	/* x:R:x:G:x:B:x 2:5:3:6:2:5:1 */
+#define LCDCTRL_PXLFORM_RGB888		5	/* R:G:B 8:8:8 */
+#define LCDCTRL_DPI_EN		BIT(8)
+#define LCDCTRL_HSYNC_POL	BIT(17) /* Polarity of HSYNC signal */
+#define LCDCTRL_DE_POL		BIT(18) /* Polarity of DE signal */
+#define LCDCTRL_VSYNC_POL	BIT(19) /* Polarity of VSYNC signal */
+#define LCDCTRL_DCLK_POL	BIT(20) /* Polarity of pixel clock */
 
 /* SPI Master Registers */
 #define SPICMR			0x0450
@@ -139,14 +144,16 @@ static int tc358762_init(struct tc358762 *ctx)
 
 	tc358762_write(ctx, SPICMR, 0x00);
 
-	lcdctrl = LCDCTRL_VSDELAY(1) | LCDCTRL_RGB888 |
-		  LCDCTRL_UNK6 | LCDCTRL_VTGEN;
+	lcdctrl = FIELD_PREP(LCDCTRL_PXLFORM, LCDCTRL_PXLFORM_RGB888) |
+		  LCDCTRL_DPI_EN;
+
+	lcdctrl |= LCDCTRL_DCLK_POL;
 
 	if (ctx->mode.flags & DRM_MODE_FLAG_NHSYNC)
-		lcdctrl |= LCDCTRL_HSPOL;
+		lcdctrl |= LCDCTRL_HSYNC_POL;
 
 	if (ctx->mode.flags & DRM_MODE_FLAG_NVSYNC)
-		lcdctrl |= LCDCTRL_VSPOL;
+		lcdctrl |= LCDCTRL_VSYNC_POL;
 
 	tc358762_write(ctx, LCDCTRL, lcdctrl);
 

-- 
2.43.0