[PATCH 5/7] drm/bridge: tc358767: reject modes which require too much BW

[Tomi Valkeinen]

On 19/11/18 09:36, Andrzej Hajda wrote:
> On 29.10.2018 12:46, Tomi Valkeinen wrote:
>> The current driver accepts any videomode with pclk < 154MHz. This is not
>> correct, as with 1 lane and/or 1.62Mbps speed not all videomodes can be
>> supported.
>>
>> Add code to reject modes that require more bandwidth that is available.
>>
>> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
> 
>> ---
>>  drivers/gpu/drm/bridge/tc358767.c | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
>> index ab299f4debfa..b026b5ef7378 100644
>> --- a/drivers/gpu/drm/bridge/tc358767.c
>> +++ b/drivers/gpu/drm/bridge/tc358767.c
>> @@ -1114,10 +1114,20 @@ static bool tc_bridge_mode_fixup(struct drm_bridge *bridge,
>>  static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connector,
>>  				   struct drm_display_mode *mode)
>>  {
>> +	struct tc_data *tc = connector_to_tc(connector);
>> +	u32 req, avail;
>> +	u32 bits_per_pixel = 24;
>> +
>>  	/* DPI interface clock limitation: upto 154 MHz */
>>  	if (mode->clock > 154000)
>>  		return MODE_CLOCK_HIGH;
>>  
>> +	req = mode->clock * bits_per_pixel / 8 / 1000;
>> +	avail = tc->link.base.num_lanes * tc->link.base.rate / 1000;
> 
> 
> You can remove "/ 1000" from both lines.
> 
> Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>

Indeed, thanks!

 Tomi

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