[PATCH 4/9] drm/bridge: synopsys: dw-mipi-dsi: Add mode fixup support

Liu Ying
2023-07-17T06:14:20Z

Vendor drivers may need to fixup mode due to pixel clock tree limitation,
so introduce the ->mode_fixup() callcack to struct dw_mipi_dsi_plat_data
and call it at atomic check stage if available.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 14 ++++++++++++++
include/drm/bridge/dw_mipi_dsi.h | 3 +++
2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 8cd89a63b5f2..c754d55f71d1 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -571,9 +571,23 @@ static int dw_mipi_dsi_bridge_atomic_check(struct drm_bridge *bridge,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
+ struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
+ const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
+ bool ret;
+
bridge_state->input_bus_cfg.flags =
DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;

+ if (pdata->mode_fixup) {
+ ret = pdata->mode_fixup(pdata->priv_data, &crtc_state->mode,
+ &crtc_state->adjusted_mode);
+ if (!ret) {
+ DRM_DEBUG_DRIVER("failed to fixup mode " DRM_MODE_FMT "\n",
+ DRM_MODE_ARG(&crtc_state->mode));
+ return -EINVAL;
+ }
+ }
+
return 0;
}

diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
index 246650f2814f..65d5e68065e3 100644
--- a/include/drm/bridge/dw_mipi_dsi.h
+++ b/include/drm/bridge/dw_mipi_dsi.h
@@ -59,6 +59,9 @@ struct dw_mipi_dsi_plat_data {
unsigned long mode_flags,
u32 lanes, u32 format);

+ bool (*mode_fixup)(void *priv_data, const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode);
+
u32 *(*get_input_bus_fmts)(void *priv_data,
struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
--
2.37.1