drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus

We want to provide our panel with access to the DP AUX channel. The
way to do this is to let our panel be a child of ours using the fancy
new DP AUX bus support.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210611101711.v10.8.Ib5fe0638da85800141ce141bb8e441c5f25438d4@changeid

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 85b6736..431b6e1 100644 (file)
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -303,6 +303,7 @@ config DRM_TI_SN65DSI86
        select DRM_PANEL
        select DRM_MIPI_DSI
        select AUXILIARY_BUS
+       select DRM_DP_AUX_BUS
        help
          Texas Instruments SN65DSI86 DSI to eDP Bridge driver
 

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 8e61005..32bd35c 100644 (file)
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -23,6 +23,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_dp_aux_bus.h>
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
@@ -1426,12 +1427,17 @@ static int ti_sn_aux_probe(struct auxiliary_device *adev,
                           const struct auxiliary_device_id *id)
 {
        struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent);
+       int ret;
 
        pdata->aux.name = "ti-sn65dsi86-aux";
        pdata->aux.dev = &adev->dev;
        pdata->aux.transfer = ti_sn_aux_transfer;
        drm_dp_aux_init(&pdata->aux);
 
+       ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux);
+       if (ret)
+               return ret;
+
        /*
         * The eDP to MIPI bridge parts don't work until the AUX channel is
         * setup so we don't add it in the main driver probe, we add it now.