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drm/bridge/sii8620: filter unsupported modes 

The maximum pixel clock depends on the version of the connected MHL
adapter. Add mode_valid callback to filter out modes with too high pixel
clock to avoid failure in mode_fixup later.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171109102831.19844-1-m.szyprowski@samsung.com
This commit is contained in:
Marek Szyprowski 2017-11-09 11:28:31 +01:00 committed by Andrzej Hajda
parent 460c3b0029
commit e7c2e4d368
1 changed files with 14 additions and 0 deletions
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14
drivers/gpu/drm/bridge/sil-sii8620.c
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@ -2191,6 +2191,19 @@ static void sii8620_detach(struct drm_bridge *bridge)
rc_unregister_device(ctx->rc_dev);
}
static enum drm_mode_status sii8620_mode_valid(struct drm_bridge *bridge,
const struct drm_display_mode *mode)
{
struct sii8620 *ctx = bridge_to_sii8620(bridge);
bool can_pack = ctx->devcap[MHL_DCAP_VID_LINK_MODE] &
MHL_DCAP_VID_LINK_PPIXEL;
unsigned int max_pclk = sii8620_is_mhl3(ctx) ? MHL3_MAX_LCLK :
MHL1_MAX_LCLK;
max_pclk /= can_pack ? 2 : 3;
return (mode->clock > max_pclk) ? MODE_CLOCK_HIGH : MODE_OK;
}
static bool sii8620_mode_fixup(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
@ -2238,6 +2251,7 @@ static const struct drm_bridge_funcs sii8620_bridge_funcs = {
.attach = sii8620_attach,
.detach = sii8620_detach,
.mode_fixup = sii8620_mode_fixup,
.mode_valid = sii8620_mode_valid,
};
static int sii8620_probe(struct i2c_client *client,