[PATCH v1 1/5] video: tegra: parametrize PCLK and DE polarity

[Ion Agorria]

From: Svyatoslav Ryhel <clamor95 at gmail.com>

Configure pixel clock and data enable polarity according to panel flags.

Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 arch/arm/include/asm/arch-tegra/dc.h |  3 +++
 drivers/video/tegra/dc.c             | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm/include/asm/arch-tegra/dc.h b/arch/arm/include/asm/arch-tegra/dc.h
index ab12cc9c7d0..22f8f977cc6 100644
--- a/arch/arm/include/asm/arch-tegra/dc.h
+++ b/arch/arm/include/asm/arch-tegra/dc.h
@@ -448,6 +448,9 @@ enum win_color_depth_id {
 #define LVS_OUTPUT_POLARITY_LOW		BIT(28)
 #define LSC0_OUTPUT_POLARITY_LOW	BIT(24)
 
+/* DC_COM_PIN_OUTPUT_POLARITY3 0x309 */
+#define LSPI_OUTPUT_POLARITY_LOW	BIT(8)
+
 /* DC_COM_PIN_OUTPUT_SELECT6 0x31a */
 #define LDC_OUTPUT_SELECT_V_PULSE1	BIT(14) /* 100b */
 
diff --git a/drivers/video/tegra/dc.c b/drivers/video/tegra/dc.c
index f0e3d2c993f..ced49718834 100644
--- a/drivers/video/tegra/dc.c
+++ b/drivers/video/tegra/dc.c
@@ -238,8 +238,24 @@ static void rgb_enable(struct tegra_lcd_priv *priv)
 	else
 		value &= ~LVS_OUTPUT_POLARITY_LOW;
 
+	/* configure pixel data signal polarity */
+	if (dt->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+		value &= ~LSC0_OUTPUT_POLARITY_LOW;
+	else
+		value |= LSC0_OUTPUT_POLARITY_LOW;
+
 	writel(value, &com->pin_output_polarity[1]);
 
+	/* configure data enable signal polarity */
+	value = readl(&com->pin_output_polarity[3]);
+
+	if (dt->flags & DISPLAY_FLAGS_DE_LOW)
+		value |= LSPI_OUTPUT_POLARITY_LOW;
+	else
+		value &= ~LSPI_OUTPUT_POLARITY_LOW;
+
+	writel(value, &com->pin_output_polarity[3]);
+
 	for (i = 0; i < PIN_OUTPUT_SEL_COUNT; i++)
 		writel(rgb_sel_tab[i], &com->pin_output_sel[i]);
 }
-- 
2.50.0