From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Tue, 13 Jun 2017 12:02:09 +0300
Subject: drm/omap: fix analog tv-out modecheck
Git-commit: beea6214d1cc5bb08ce25ffe06b57fb948445bed
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

omapdrm rejects all venc (analog tv-out) videomodes, due to somewhat
strict checking of the values, making tv-out unusable.

We only support two videomodes, one for PAL and one for NTSC, so instead
of trying to check every field in the videomode struct, this patch makes
the driver check only the pixel clock and the size of the display.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/omapdrm/dss/venc.c |   65 +++++++++++++++++++++++++++++--------
 1 file changed, 51 insertions(+), 14 deletions(-)

--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -263,6 +263,12 @@ static const struct venc_config venc_con
 	.fid_ext_start_y__fid_ext_offset_y	= 0x01380005,
 };
 
+enum venc_videomode {
+	VENC_MODE_UNKNOWN,
+	VENC_MODE_PAL,
+	VENC_MODE_NTSC,
+};
+
 static const struct videomode omap_dss_pal_vm = {
 	.hactive	= 720,
 	.vactive	= 574,
@@ -297,6 +303,24 @@ static const struct videomode omap_dss_n
 			  DISPLAY_FLAGS_SYNC_NEGEDGE,
 };
 
+static enum venc_videomode venc_get_videomode(const struct videomode *vm)
+{
+	if (!(vm->flags & DISPLAY_FLAGS_INTERLACED))
+		return VENC_MODE_UNKNOWN;
+
+	if (vm->pixelclock == omap_dss_pal_vm.pixelclock &&
+	    vm->hactive == omap_dss_pal_vm.hactive &&
+	    vm->vactive == omap_dss_pal_vm.vactive)
+		return VENC_MODE_PAL;
+
+	if (vm->pixelclock == omap_dss_ntsc_vm.pixelclock &&
+	    vm->hactive == omap_dss_ntsc_vm.hactive &&
+	    vm->vactive == omap_dss_ntsc_vm.vactive)
+		return VENC_MODE_NTSC;
+
+	return VENC_MODE_UNKNOWN;
+}
+
 static struct {
 	struct platform_device *pdev;
 	void __iomem *base;
@@ -423,14 +447,14 @@ static void venc_runtime_put(void)
 
 static const struct venc_config *venc_timings_to_config(struct videomode *vm)
 {
-	if (memcmp(&omap_dss_pal_vm, vm, sizeof(*vm)) == 0)
+	switch (venc_get_videomode(vm)) {
+	default:
+		WARN_ON_ONCE(1);
+	case VENC_MODE_PAL:
 		return &venc_config_pal_trm;
-
-	if (memcmp(&omap_dss_ntsc_vm, vm, sizeof(*vm)) == 0)
+	case VENC_MODE_NTSC:
 		return &venc_config_ntsc_trm;
-
-	BUG();
-	return NULL;
+	}
 }
 
 static int venc_power_on(struct omap_dss_device *dssdev)
@@ -541,15 +565,28 @@ static void venc_display_disable(struct
 static void venc_set_timings(struct omap_dss_device *dssdev,
 			     struct videomode *vm)
 {
+	struct videomode actual_vm;
+
 	DSSDBG("venc_set_timings\n");
 
 	mutex_lock(&venc.venc_lock);
 
+	switch (venc_get_videomode(vm)) {
+	default:
+		WARN_ON_ONCE(1);
+	case VENC_MODE_PAL:
+		actual_vm = omap_dss_pal_vm;
+		break;
+	case VENC_MODE_NTSC:
+		actual_vm = omap_dss_ntsc_vm;
+		break;
+	}
+
 	/* Reset WSS data when the TV standard changes. */
-	if (memcmp(&venc.vm, vm, sizeof(*vm)))
+	if (memcmp(&venc.vm, &actual_vm, sizeof(actual_vm)))
 		venc.wss_data = 0;
 
-	venc.vm = *vm;
+	venc.vm = actual_vm;
 
 	dispc_set_tv_pclk(13500000);
 
@@ -561,13 +598,13 @@ static int venc_check_timings(struct oma
 {
 	DSSDBG("venc_check_timings\n");
 
-	if (memcmp(&omap_dss_pal_vm, vm, sizeof(*vm)) == 0)
+	switch (venc_get_videomode(vm)) {
+	case VENC_MODE_PAL:
+	case VENC_MODE_NTSC:
 		return 0;
-
-	if (memcmp(&omap_dss_ntsc_vm, vm, sizeof(*vm)) == 0)
-		return 0;
-
-	return -EINVAL;
+	default:
+		return -EINVAL;
+	}
 }
 
 static void venc_get_timings(struct omap_dss_device *dssdev,