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Subject[PATCH 03/13] drm: sun4i: add support for H3's TCON
Date
From: Icenowy Zheng <icenowy@aosc.xyz>

Allwinner H3 has two special TCONs without channel 0.

Add support for this kind of TCON.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
drivers/gpu/drm/sun4i/sun4i_drv.c | 1 +
drivers/gpu/drm/sun4i/sun4i_tcon.c | 43 +++++++++++++++++++++++++++-----------
drivers/gpu/drm/sun4i/sun4i_tcon.h | 1 +
3 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index ace59651892f..fd99fe8a4df7 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -188,6 +188,7 @@ static bool sun4i_drv_node_is_tcon(struct device_node *node)
of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") ||
+ of_device_is_compatible(node, "allwinner,sun8i-h3-tcon") ||
of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon");
}

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index d9791292553e..270f09e381a5 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -59,6 +59,7 @@ void sun4i_tcon_channel_disable(struct sun4i_tcon *tcon, int channel)

/* Disable the TCON's channel */
if (channel == 0) {
+ WARN_ON(!tcon->quirks->has_channel_0);
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
SUN4I_TCON0_CTL_TCON_ENABLE, 0);
clk_disable_unprepare(tcon->dclk);
@@ -78,6 +79,7 @@ void sun4i_tcon_channel_enable(struct sun4i_tcon *tcon, int channel)

/* Enable the TCON's channel */
if (channel == 0) {
+ WARN_ON(!tcon->quirks->has_channel_0);
regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
SUN4I_TCON0_CTL_TCON_ENABLE,
SUN4I_TCON0_CTL_TCON_ENABLE);
@@ -157,6 +159,8 @@ void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
u8 clk_delay;
u32 val = 0;

+ WARN_ON(!tcon->quirks->has_channel_0);
+
/* Configure the dot clock */
clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);

@@ -366,10 +370,12 @@ static int sun4i_tcon_init_clocks(struct device *dev,
}
clk_prepare_enable(tcon->clk);

- tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
- if (IS_ERR(tcon->sclk0)) {
- dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
- return PTR_ERR(tcon->sclk0);
+ if (tcon->quirks->has_channel_0) {
+ tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
+ if (IS_ERR(tcon->sclk0)) {
+ dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
+ return PTR_ERR(tcon->sclk0);
+ }
}

if (tcon->quirks->has_channel_1) {
@@ -551,10 +557,12 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
goto err_free_clocks;
}

- ret = sun4i_dclk_create(dev, tcon);
- if (ret) {
- dev_err(dev, "Couldn't create our TCON dot clock\n");
- goto err_free_clocks;
+ if (tcon->quirks->has_channel_0) {
+ ret = sun4i_dclk_create(dev, tcon);
+ if (ret) {
+ dev_err(dev, "Couldn't create our TCON dot clock\n");
+ goto err_free_clocks;
+ }
}

ret = sun4i_tcon_init_irq(dev, tcon);
@@ -579,7 +587,8 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
return 0;

err_free_dotclock:
- sun4i_dclk_free(tcon);
+ if (tcon->quirks->has_channel_0)
+ sun4i_dclk_free(tcon);
err_free_clocks:
sun4i_tcon_free_clocks(tcon);
err_assert_reset:
@@ -593,7 +602,9 @@ static void sun4i_tcon_unbind(struct device *dev, struct device *master,
struct sun4i_tcon *tcon = dev_get_drvdata(dev);

list_del(&tcon->list);
- sun4i_dclk_free(tcon);
+
+ if (tcon->quirks->has_channel_0)
+ sun4i_dclk_free(tcon);
sun4i_tcon_free_clocks(tcon);
}

@@ -625,23 +636,30 @@ static int sun4i_tcon_remove(struct platform_device *pdev)

static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
.has_unknown_mux = true,
+ .has_channel_0 = true,
.has_channel_1 = true,
};

static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
+ .has_channel_0 = true,
.has_channel_1 = true,
};

static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
+ .has_channel_0 = true,
.has_channel_1 = true,
};

static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
- /* nothing is supported */
+ .has_channel_0 = true,
};

static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
- /* nothing is supported */
+ .has_channel_0 = true,
+};
+
+static const struct sun4i_tcon_quirks sun8i_h3_quirks = {
+ .has_channel_1 = true,
};

static const struct of_device_id sun4i_tcon_of_table[] = {
@@ -649,6 +667,7 @@ static const struct of_device_id sun4i_tcon_of_table[] = {
{ .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
{ .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
{ .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
+ { .compatible = "allwinner,sun8i-h3-tcon", .data = &sun8i_h3_quirks },
{ .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
{ }
};
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h
index 552c88ec16be..de035e598129 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -145,6 +145,7 @@

struct sun4i_tcon_quirks {
bool has_unknown_mux; /* sun5i has undocumented mux */
+ bool has_channel_0; /* some A83T+ TCONs don't have channel 0*/
bool has_channel_1; /* a33 does not have channel 1 */
};

--
2.13.0
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