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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>
This commit is contained in:
Russell King 2014-02-07 19:52:33 +00:00
parent 713456db17
commit 92fbdfcd7d
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i2c/tda998x_drv.c
View File

@ -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;
}