[PATCH 5.15 157/317] drm/tegra: dpaux: Populate AUX bus

Sasha Levin
2024-03-24T23:37:33Z

From: Thierry Reding <treding@nvidia.com>

[ Upstream commit 8913e1aea4b32a866343b14e565c62cec54f3f78 ]

The DPAUX hardware block exposes an DP AUX interface that provides
access to an AUX bus and the devices on that bus. Use the DP AUX bus
infrastructure that was recently introduced to probe devices on this
bus from DT.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Stable-dep-of: 0800880f4eb7 ("drm/tegra: dpaux: Fix PM disable depth imbalance in tegra_dpaux_probe")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/tegra/Kconfig | 1 +
drivers/gpu/drm/tegra/dpaux.c | 7 +++++++
2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/tegra/Kconfig b/drivers/gpu/drm/tegra/Kconfig
index 1650a448eabd6..b09a500934f73 100644
--- a/drivers/gpu/drm/tegra/Kconfig
+++ b/drivers/gpu/drm/tegra/Kconfig
@@ -5,6 +5,7 @@ config DRM_TEGRA
depends on COMMON_CLK
depends on DRM
depends on OF
+ select DRM_DP_AUX_BUS
select DRM_KMS_HELPER
select DRM_MIPI_DSI
select DRM_PANEL
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index c96c07c6458c3..12a92d09ac909 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -19,6 +19,7 @@
#include <linux/workqueue.h>

#include <drm/drm_dp_helper.h>
+#include <drm/drm_dp_aux_bus.h>
#include <drm/drm_panel.h>

#include "dp.h"
@@ -570,6 +571,12 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
list_add_tail(&dpaux->list, &dpaux_list);
mutex_unlock(&dpaux_lock);

+ err = devm_of_dp_aux_populate_ep_devices(&dpaux->aux);
+ if (err < 0) {
+ dev_err(dpaux->dev, "failed to populate AUX bus: %d\n", err);
+ return err;
+ }
+
return 0;
}

--
2.43.0