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path: root/drivers/gpu/drm/tegra/dpaux.c
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Diffstat (limited to 'drivers/gpu/drm/tegra/dpaux.c')
-rw-r--r--drivers/gpu/drm/tegra/dpaux.c63
1 files changed, 56 insertions, 7 deletions
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index 07b26972f487..224a7dc8e4ed 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -294,26 +294,41 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
}
dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux");
- if (IS_ERR(dpaux->rst))
+ if (IS_ERR(dpaux->rst)) {
+ dev_err(&pdev->dev, "failed to get reset control: %ld\n",
+ PTR_ERR(dpaux->rst));
return PTR_ERR(dpaux->rst);
+ }
dpaux->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(dpaux->clk))
+ if (IS_ERR(dpaux->clk)) {
+ dev_err(&pdev->dev, "failed to get module clock: %ld\n",
+ PTR_ERR(dpaux->clk));
return PTR_ERR(dpaux->clk);
+ }
err = clk_prepare_enable(dpaux->clk);
- if (err < 0)
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to enable module clock: %d\n",
+ err);
return err;
+ }
reset_control_deassert(dpaux->rst);
dpaux->clk_parent = devm_clk_get(&pdev->dev, "parent");
- if (IS_ERR(dpaux->clk_parent))
+ if (IS_ERR(dpaux->clk_parent)) {
+ dev_err(&pdev->dev, "failed to get parent clock: %ld\n",
+ PTR_ERR(dpaux->clk_parent));
return PTR_ERR(dpaux->clk_parent);
+ }
err = clk_prepare_enable(dpaux->clk_parent);
- if (err < 0)
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to enable parent clock: %d\n",
+ err);
return err;
+ }
err = clk_set_rate(dpaux->clk_parent, 270000000);
if (err < 0) {
@@ -323,8 +338,11 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
}
dpaux->vdd = devm_regulator_get(&pdev->dev, "vdd");
- if (IS_ERR(dpaux->vdd))
+ if (IS_ERR(dpaux->vdd)) {
+ dev_err(&pdev->dev, "failed to get VDD supply: %ld\n",
+ PTR_ERR(dpaux->vdd));
return PTR_ERR(dpaux->vdd);
+ }
err = devm_request_irq(dpaux->dev, dpaux->irq, tegra_dpaux_irq, 0,
dev_name(dpaux->dev), dpaux);
@@ -334,6 +352,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
return err;
}
+ disable_irq(dpaux->irq);
+
dpaux->aux.transfer = tegra_dpaux_transfer;
dpaux->aux.dev = &pdev->dev;
@@ -341,6 +361,24 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
if (err < 0)
return err;
+ /*
+ * Assume that by default the DPAUX/I2C pads will be used for HDMI,
+ * so power them up and configure them in I2C mode.
+ *
+ * The DPAUX code paths reconfigure the pads in AUX mode, but there
+ * is no possibility to perform the I2C mode configuration in the
+ * HDMI path.
+ */
+ value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_SPARE);
+ value &= ~DPAUX_HYBRID_SPARE_PAD_POWER_DOWN;
+ tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_SPARE);
+
+ value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_PADCTL);
+ value = DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV |
+ DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV |
+ DPAUX_HYBRID_PADCTL_MODE_I2C;
+ tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_PADCTL);
+
/* enable and clear all interrupts */
value = DPAUX_INTR_AUX_DONE | DPAUX_INTR_IRQ_EVENT |
DPAUX_INTR_UNPLUG_EVENT | DPAUX_INTR_PLUG_EVENT;
@@ -359,6 +397,12 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
static int tegra_dpaux_remove(struct platform_device *pdev)
{
struct tegra_dpaux *dpaux = platform_get_drvdata(pdev);
+ u32 value;
+
+ /* make sure pads are powered down when not in use */
+ value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_SPARE);
+ value |= DPAUX_HYBRID_SPARE_PAD_POWER_DOWN;
+ tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_SPARE);
drm_dp_aux_unregister(&dpaux->aux);
@@ -376,6 +420,7 @@ static int tegra_dpaux_remove(struct platform_device *pdev)
}
static const struct of_device_id tegra_dpaux_of_match[] = {
+ { .compatible = "nvidia,tegra210-dpaux", },
{ .compatible = "nvidia,tegra124-dpaux", },
{ },
};
@@ -425,8 +470,10 @@ int tegra_dpaux_attach(struct tegra_dpaux *dpaux, struct tegra_output *output)
enum drm_connector_status status;
status = tegra_dpaux_detect(dpaux);
- if (status == connector_status_connected)
+ if (status == connector_status_connected) {
+ enable_irq(dpaux->irq);
return 0;
+ }
usleep_range(1000, 2000);
}
@@ -439,6 +486,8 @@ int tegra_dpaux_detach(struct tegra_dpaux *dpaux)
unsigned long timeout;
int err;
+ disable_irq(dpaux->irq);
+
err = regulator_disable(dpaux->vdd);
if (err < 0)
return err;