drm: exynos: dsi: Add host helper for te_irq_handler

IRQ handler for te-gpio seems to be common across DSIM host.

However, Exynos is handling this via CRTC drivers but there is no clear
evidence on how the same has been handled in i.MX8MM. Keeping the handler
as-it-is can be a viable option but adding DSIM bridge core in upcoming
patches is not possible to call Exynos CRTC handler as DSIM bridge has
to be common across DRM bridge core instead of platform specific DRM
drivers like Exynos here.

So, this patch handles the handler via platform host helper, so-that
handling platform specific hook across Exynos and generic can be
reasonable till it makes it generic across all platforms.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_dsi.c

@@ -325,6 +325,7 @@ struct exynos_dsim_host_ops {
 	void (*unregister_host)(struct exynos_dsi *dsim);
 	int (*attach)(struct exynos_dsi *dsim, struct mipi_dsi_device *device);
 	void (*detach)(struct exynos_dsi *dsim, struct mipi_dsi_device *device);
+	irqreturn_t (*te_irq_handler)(struct exynos_dsi *dsim);
 };
 
 struct exynos_dsi_enc {
@@ -1333,11 +1334,10 @@ static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
 static irqreturn_t exynos_dsi_te_irq_handler(int irq, void *dev_id)
 {
 	struct exynos_dsi *dsi = (struct exynos_dsi *)dev_id;
-	struct exynos_dsi_enc *dsi_enc = dsi->priv;
-	struct drm_encoder *encoder = &dsi_enc->encoder;
+	const struct exynos_dsi_plat_data *pdata = dsi->plat_data;
 
-	if (dsi->state & DSIM_STATE_VIDOUT_AVAILABLE)
-		exynos_drm_crtc_te_handler(encoder->crtc);
+	if (pdata->host_ops && pdata->host_ops->te_irq_handler)
+		return pdata->host_ops->te_irq_handler(dsi);
 
 	return IRQ_HANDLED;
 }
@@ -1771,6 +1771,17 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
 	return 0;
 }
 
+static irqreturn_t exynos_dsim_te_irq_handler(struct exynos_dsi *dsim)
+{
+	struct exynos_dsi_enc *dsi_enc = dsim->priv;
+	struct drm_encoder *encoder = &dsi_enc->encoder;
+
+	if (dsim->state & DSIM_STATE_VIDOUT_AVAILABLE)
+		exynos_drm_crtc_te_handler(encoder->crtc);
+
+	return IRQ_HANDLED;
+}
+
 static int exynos_dsim_host_attach(struct exynos_dsi *dsim,
 				   struct mipi_dsi_device *device)
 {
@@ -2068,6 +2079,7 @@ static const struct exynos_dsim_host_ops exynos_dsi_host_ops = {
 	.unregister_host = exynos_dsi_unregister_host,
 	.attach = exynos_dsim_host_attach,
 	.detach = exynos_dsim_host_detach,
+	.te_irq_handler = exynos_dsim_te_irq_handler,
 };
 
 static const struct exynos_dsi_plat_data exynos3250_dsi_pdata = {