@@ -655,8 +655,8 @@ cdns_dsi_bridge_mode_valid(struct drm_bridge *bridge,
return MODE_OK;
}
-static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+static void cdns_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
struct cdns_dsi *dsi = input_to_dsi(input);
@@ -676,15 +676,6 @@ static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
pm_runtime_put(dsi->base.dev);
}
-static void cdns_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
-{
- struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
- struct cdns_dsi *dsi = input_to_dsi(input);
-
- pm_runtime_put(dsi->base.dev);
-}
-
static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
{
struct cdns_dsi_output *output = &dsi->output;
@@ -754,8 +745,8 @@ static void cdns_dsi_init_link(struct cdns_dsi *dsi)
dsi->link_initialized = true;
}
-static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
+static void cdns_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
struct cdns_dsi *dsi = input_to_dsi(input);
@@ -906,19 +897,6 @@ static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
writel(tmp, dsi->regs + MCTL_MAIN_EN);
}
-static void cdns_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
-{
- struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
- struct cdns_dsi *dsi = input_to_dsi(input);
-
- if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
- return;
-
- cdns_dsi_init_link(dsi);
- cdns_dsi_hs_init(dsi);
-}
-
static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
@@ -949,9 +927,7 @@ static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
.attach = cdns_dsi_bridge_attach,
.mode_valid = cdns_dsi_bridge_mode_valid,
- .atomic_disable = cdns_dsi_bridge_atomic_disable,
.atomic_pre_enable = cdns_dsi_bridge_atomic_pre_enable,
- .atomic_enable = cdns_dsi_bridge_atomic_enable,
.atomic_post_disable = cdns_dsi_bridge_atomic_post_disable,
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
The cdns-dsi controller requires that it be turned on completely before the input DPI's source has begun streaming[0]. Not having that, allows for a small window before cdns-dsi enable and after cdns-dsi disable where the previous entity (in this case tidss's videoport) to continue streaming DPI video signals. This small window where cdns-dsi is disabled but is still receiving signals causes the input FIFO of cdns-dsi to get corrupted. This causes the colors to shift on the output display. The colors can either shift by one color component (R->G, G->B, B->R), or by two color components (R->B, G->R, B->G). Since tidss's videoport starts streaming via crtc enable hooks, we need cdns-dsi to be up and running before that. Now that the bridges are pre_enabled before crtc is enabled, and post_disabled after crtc is disabled, use the pre_enable and post_disable hooks to get cdns-dsi ready and running before the tidss videoport to get pass the color shift issues. [0]: See section 12.6.5.7.3 "Start-up Procedure" in J721E SoC TRM TRM Link: http://www.ti.com/lit/pdf/spruil1 Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com> --- .../gpu/drm/bridge/cadence/cdns-dsi-core.c | 32 +++---------------- 1 file changed, 4 insertions(+), 28 deletions(-)