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    Subject[PATCH v8 09/11] drm/bridge: ti-sn65dsi86: Add support for the DP AUX bus
    Date
    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>
    ---

    (no changes since v7)

    Changes in v7:
    - Patch to support for DP AUX bus on ti-sn65dsi86 new for v7.

    drivers/gpu/drm/bridge/Kconfig | 1 +
    drivers/gpu/drm/bridge/ti-sn65dsi86.c | 13 +++++++++++--
    2 files changed, 12 insertions(+), 2 deletions(-)

    diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
    index 7e7f28eb9546..a82952a85db4 100644
    --- a/drivers/gpu/drm/bridge/Kconfig
    +++ b/drivers/gpu/drm/bridge/Kconfig
    @@ -292,6 +292,7 @@ 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 1ea07d704705..5263206792f6 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>
    @@ -1448,19 +1449,27 @@ static int ti_sn_aux_probe(struct auxiliary_device *adev,
    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)
    + goto err;
    +
    /*
    * 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.
    */
    ret = ti_sn65dsi86_add_aux_device(pdata, &pdata->bridge_aux, "bridge");

    + if (ret)
    + goto err;
    +
    + return 0;
    +err:
    /*
    * Clear of_node on any errors. Really this only matters if the error
    * is -EPROBE_DEFER to avoid (again) keep pinctrl from claiming when
    * it tries the probe again, but it shouldn't hurt on any error.
    */
    - if (ret)
    - adev->dev.of_node = NULL;
    + adev->dev.of_node = NULL;

    return ret;
    }
    --
    2.31.1.818.g46aad6cb9e-goog
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