From cc5a3fc041f0104d97ac61b0423ec533d7a93214 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Fri, 11 Jun 2021 10:17:42 -0700 Subject: [PATCH] drm/panel: panel-simple: Stash DP AUX bus; allow using it for DDC If panel-simple is instantiated as a DP AUX bus endpoint then we have access to the DP AUX bus. Let's stash it in the panel-simple structure, leaving it NULL for the cases where the panel is instantiated in other ways. If we happen to have access to the DP AUX bus and we weren't provided the ddc-i2c-bus in some other manner, let's use the DP AUX bus for it. Signed-off-by: Douglas Anderson Reviewed-by: Lyude Paul Reviewed-by: Linus Walleij Link: https://patchwork.freedesktop.org/patch/msgid/20210611101711.v10.6.I18e60221f6d048d14d6c50a770b15f356fa75092@changeid --- drivers/gpu/drm/panel/panel-simple.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index d3b5ae2..df6fbd1 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include @@ -186,6 +187,7 @@ struct panel_simple { struct regulator *supply; struct i2c_adapter *ddc; + struct drm_dp_aux *aux; struct gpio_desc *enable_gpio; struct gpio_desc *hpd_gpio; @@ -658,7 +660,8 @@ static void panel_simple_parse_panel_timing_node(struct device *dev, dev_err(dev, "Reject override mode: No display_timing found\n"); } -static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) +static int panel_simple_probe(struct device *dev, const struct panel_desc *desc, + struct drm_dp_aux *aux) { struct panel_simple *panel; struct display_timing dt; @@ -674,6 +677,7 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) panel->enabled = false; panel->prepared_time = 0; panel->desc = desc; + panel->aux = aux; panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd"); if (!panel->no_hpd) { @@ -708,6 +712,8 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) if (!panel->ddc) return -EPROBE_DEFER; + } else if (aux) { + panel->ddc = &aux->ddc; } if (desc == &panel_dpi) { @@ -802,7 +808,7 @@ disable_pm_runtime: pm_runtime_dont_use_autosuspend(dev); pm_runtime_disable(dev); free_ddc: - if (panel->ddc) + if (panel->ddc && (!panel->aux || panel->ddc != &panel->aux->ddc)) put_device(&panel->ddc->dev); return err; @@ -818,7 +824,7 @@ static int panel_simple_remove(struct device *dev) pm_runtime_dont_use_autosuspend(dev); pm_runtime_disable(dev); - if (panel->ddc) + if (panel->ddc && (!panel->aux || panel->ddc != &panel->aux->ddc)) put_device(&panel->ddc->dev); return 0; @@ -4633,7 +4639,7 @@ static int panel_simple_platform_probe(struct platform_device *pdev) if (!id) return -ENODEV; - return panel_simple_probe(&pdev->dev, id->data); + return panel_simple_probe(&pdev->dev, id->data, NULL); } static int panel_simple_platform_remove(struct platform_device *pdev) @@ -4913,7 +4919,7 @@ static int panel_simple_dsi_probe(struct mipi_dsi_device *dsi) desc = id->data; - err = panel_simple_probe(&dsi->dev, &desc->desc); + err = panel_simple_probe(&dsi->dev, &desc->desc, NULL); if (err < 0) return err; @@ -4966,7 +4972,7 @@ static int panel_simple_dp_aux_ep_probe(struct dp_aux_ep_device *aux_ep) if (!id) return -ENODEV; - return panel_simple_probe(&aux_ep->dev, id->data); + return panel_simple_probe(&aux_ep->dev, id->data, aux_ep->aux); } static void panel_simple_dp_aux_ep_remove(struct dp_aux_ep_device *aux_ep) -- 2.7.4