From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 7 Feb 2014 19:52:33 +0000 (+0000)
Subject: drm/i2c: tda998x: add some basic mode validation
X-Git-Tag: v4.9.8~5935^2~17^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=92fbdfcd7d6b9db6b0a738c5bd85a4a9d731629d;p=platform%2Fkernel%2Flinux-rpi3.git

drm/i2c: tda998x: add some basic mode validation

The TDA998x can't handle modes with clocks above 150MHz, or resolutions
larger than 8192x2048.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 3ff7d07..5a738ad 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -810,6 +810,12 @@ static int
 tda998x_encoder_mode_valid(struct drm_encoder *encoder,
 			  struct drm_display_mode *mode)
 {
+	if (mode->clock > 150000)
+		return MODE_CLOCK_HIGH;
+	if (mode->htotal >= BIT(13))
+		return MODE_BAD_HVALUE;
+	if (mode->vtotal >= BIT(11))
+		return MODE_BAD_VVALUE;
 	return MODE_OK;
 }