[PATCH v4 4/5] drm/bridge: cadence: cdns-mhdp8546-core: Add mode_valid hook to drm_bridge_funcs

[Jayesh Choudhary]

Add cdns_mhdp_bridge_mode_valid() to check if specific mode is valid for
this bridge or not. In the legacy !(DBANC) usecase, we were using the hook
from drm_connector_helper_funcs but with removal of legacy code, we need
to have mode_valid() in drm_bridge_funcs.

Fixes: c932ced6b585 ("drm/tidss: Update encoder/bridge chain connect model")
Signed-off-by: Jayesh Choudhary <j-choudh...@ti.com>
---
 .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c 
b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 872a2c4e1701..3ce0930bf5aa 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1998,6 +1998,25 @@ static const struct drm_edid 
*cdns_mhdp_bridge_edid_read(struct drm_bridge *brid
        return cdns_mhdp_edid_read(mhdp, connector);
 }
 
+static enum drm_mode_status
+cdns_mhdp_bridge_mode_valid(struct drm_bridge *bridge,
+                           const struct drm_display_info *info,
+                           const struct drm_display_mode *mode)
+{
+       struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
+
+       mutex_lock(&mhdp->link_mutex);
+
+       if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
+                                   mhdp->link.rate)) {
+               mutex_unlock(&mhdp->link_mutex);
+               return MODE_CLOCK_HIGH;
+       }
+
+       mutex_unlock(&mhdp->link_mutex);
+       return MODE_OK;
+}
+
 static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
        .atomic_enable = cdns_mhdp_atomic_enable,
        .atomic_disable = cdns_mhdp_atomic_disable,
@@ -2012,6 +2031,7 @@ static const struct drm_bridge_funcs 
cdns_mhdp_bridge_funcs = {
        .edid_read = cdns_mhdp_bridge_edid_read,
        .hpd_enable = cdns_mhdp_bridge_hpd_enable,
        .hpd_disable = cdns_mhdp_bridge_hpd_disable,
+       .mode_valid = cdns_mhdp_bridge_mode_valid,
 };
 
 static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool 
*hpd_pulse)
-- 
2.34.1