drm/exynos: fimd: add HW trigger support

This patch adds HW trigger support on i80 mode.

Until now, Exynos DRM only supported SW trigger which was set
SWTRGCMD bit of TRIGCON register by CPU to transfer scanout
buffer to Display bus device or panel.

With this patch, the transmission to Display bus device or
panel will be initiated by FIMD controller.
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_fimd.c

@@ -72,6 +72,11 @@
 #define TRIGCON				0x1A4
 #define TRGMODE_I80_RGB_ENABLE_I80	(1 << 0)
 #define SWTRGCMD_I80_RGB_ENABLE		(1 << 1)
+/* Exynos3250, 3472, 4415, 5260 5410, 5420 and 5422 only supported. */
+#define HWTRGEN_I80_RGB_ENABLE		(1 << 3)
+#define HWTRGMASK_I80_RGB_ENABLE	(1 << 4)
+/* Exynos3250, 3472, 4415, 5260, 5420 and 5422 only supported. */
+#define HWTRIGEN_PER_RGB_ENABLE		(1 << 31)
 
 /* display mode change control register except exynos4 */
 #define VIDOUT_CON			0x000
@@ -89,12 +94,16 @@
 /* FIMD has totally five hardware windows. */
 #define WINDOWS_NR	5
 
+/* HW trigger flag on i80 panel. */
+#define I80_HW_TRG     (1 << 1)
+
 struct fimd_driver_data {
 	unsigned int timing_base;
 	unsigned int lcdblk_offset;
 	unsigned int lcdblk_vt_shift;
 	unsigned int lcdblk_bypass_shift;
 	unsigned int lcdblk_mic_bypass_shift;
+	unsigned int trg_type;
 
 	unsigned int has_shadowcon:1;
 	unsigned int has_clksel:1;
@@ -103,20 +112,25 @@ struct fimd_driver_data {
 	unsigned int has_vtsel:1;
 	unsigned int has_mic_bypass:1;
 	unsigned int has_dp_clk:1;
+	unsigned int has_hw_trigger:1;
+	unsigned int has_trigger_per_te:1;
 };
 
 static struct fimd_driver_data s3c64xx_fimd_driver_data = {
 	.timing_base = 0x0,
 	.has_clksel = 1,
 	.has_limited_fmt = 1,
+	.has_hw_trigger = 1,
 };
 
 static struct fimd_driver_data exynos3_fimd_driver_data = {
 	.timing_base = 0x20000,
 	.lcdblk_offset = 0x210,
 	.lcdblk_bypass_shift = 1,
+	.trg_type = I80_HW_TRG,
 	.has_shadowcon = 1,
 	.has_vidoutcon = 1,
+	.has_trigger_per_te = 1,
 };
 
 static struct fimd_driver_data exynos4_fimd_driver_data = {
@@ -133,9 +147,11 @@ static struct fimd_driver_data exynos4415_fimd_driver_data = {
 	.lcdblk_offset = 0x210,
 	.lcdblk_vt_shift = 10,
 	.lcdblk_bypass_shift = 1,
+	.trg_type = I80_HW_TRG,
 	.has_shadowcon = 1,
 	.has_vidoutcon = 1,
 	.has_vtsel = 1,
+	.has_trigger_per_te = 1,
 };
 
 static struct fimd_driver_data exynos5_fimd_driver_data = {
@@ -155,11 +171,14 @@ static struct fimd_driver_data exynos5420_fimd_driver_data = {
 	.lcdblk_vt_shift = 24,
 	.lcdblk_bypass_shift = 15,
 	.lcdblk_mic_bypass_shift = 11,
+	.trg_type = I80_HW_TRG,
 	.has_shadowcon = 1,
 	.has_vidoutcon = 1,
 	.has_vtsel = 1,
 	.has_mic_bypass = 1,
 	.has_dp_clk = 1,
+	.has_hw_trigger = 1,
+	.has_trigger_per_te = 1,
 };
 
 struct fimd_context {
@@ -395,6 +414,27 @@ static u32 fimd_calc_clkdiv(struct fimd_context *ctx,
 	return (clkdiv < 0x100) ? clkdiv : 0xff;
 }
 
+static void fimd_setup_trigger(struct fimd_context *ctx)
+{
+	void __iomem *timing_base = ctx->regs + ctx->driver_data->timing_base;
+	u32 trg_type = ctx->driver_data->trg_type;
+	u32 val = readl(timing_base + TRIGCON);
+
+	val &= ~(TRGMODE_I80_RGB_ENABLE_I80);
+
+	if (trg_type == I80_HW_TRG) {
+		if (ctx->driver_data->has_hw_trigger)
+			val |= HWTRGEN_I80_RGB_ENABLE |
+				HWTRGMASK_I80_RGB_ENABLE;
+		if (ctx->driver_data->has_trigger_per_te)
+			val |= HWTRIGEN_PER_RGB_ENABLE;
+	} else {
+		val |= TRGMODE_I80_RGB_ENABLE_I80;
+	}
+
+	writel(val, timing_base + TRIGCON);
+}
+
 static void fimd_commit(struct exynos_drm_crtc *crtc)
 {
 	struct fimd_context *ctx = crtc->ctx;
@@ -490,6 +530,8 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
 	       VIDTCON2_HOZVAL_E(mode->hdisplay - 1);
 	writel(val, ctx->regs + driver_data->timing_base + VIDTCON2);
 
+	fimd_setup_trigger(ctx);
+
 	/*
 	 * fields of register with prefix '_F' would be updated
 	 * at vsync(same as dma start)
@@ -851,11 +893,15 @@ static void fimd_trigger(struct device *dev)
 static void fimd_te_handler(struct exynos_drm_crtc *crtc)
 {
 	struct fimd_context *ctx = crtc->ctx;
+	u32 trg_type = ctx->driver_data->trg_type;
 
 	/* Checks the crtc is detached already from encoder */
 	if (ctx->pipe < 0 || !ctx->drm_dev)
 		return;
 
+	if (trg_type == I80_HW_TRG)
+		goto out;
+
 	/*
 	 * If there is a page flip request, triggers and handles the page flip
 	 * event so that current fb can be updated into panel GRAM.
@@ -863,6 +909,7 @@ static void fimd_te_handler(struct exynos_drm_crtc *crtc)
 	if (atomic_add_unless(&ctx->win_updated, -1, 0))
 		fimd_trigger(ctx->dev);
 
+out:
 	/* Wakes up vsync event queue */
 	if (atomic_read(&ctx->wait_vsync_event)) {
 		atomic_set(&ctx->wait_vsync_event, 0);