From: Douglas Anderson <dianders@chromium.org>
Date: Fri, 11 Jun 2021 17:17:44 +0000 (-0700)
Subject: drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus
X-Git-Tag: v5.15-rc1~148^2~23^2~192
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e0bbcc6233f7c664474287aaed8dcffd935a1869;p=thirdparty%2Flinux.git

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 85b673613687d..431b6e12a81fe 100644
--- 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 8e61005cf4add..32bd35c98d95d 100644
--- 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.