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drm: bridge: thc63: Restrict modes based on hardware operating frequency

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The THC63LVD1024 is restricted to a pixel clock frequency in the range
of 8 to 135 MHz. Implement the bridge .mode_valid() operation
accordingly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
This commit is contained in:
Laurent Pinchart 2018-08-22 17:04:06 +03:00
parent 9734a7009d
commit 399d9f2f19
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/bridge/thc63lvd1024.c
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@ -45,6 +45,23 @@ static int thc63_attach(struct drm_bridge *bridge)
return drm_bridge_attach(bridge->encoder, thc63->next, bridge);
}
static enum drm_mode_status thc63_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
/*
* The THC63LVD1024 clock frequency range is 8 to 135 MHz in single-in
* mode. Note that the limits are different in dual-in, single-out mode,
* and will need to be adjusted accordingly.
*/
if (mode->clock < 8000)
return MODE_CLOCK_LOW;
if (mode->clock > 135000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static void thc63_enable(struct drm_bridge *bridge)
{
struct thc63_dev *thc63 = to_thc63(bridge);
@ -77,6 +94,7 @@ static void thc63_disable(struct drm_bridge *bridge)
static const struct drm_bridge_funcs thc63_bridge_func = {
.attach = thc63_attach,
.mode_valid = thc63_mode_valid,
.enable = thc63_enable,
.disable = thc63_disable,
};