[PATCH v3 12/12] drm/mediatek: dpi: Add mt8195 hdmi to DPI driver

Guillaume Ranquet
2022-11-04T14:35:33Z

Add the DPI1 hdmi path support in mtk dpi driver

Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 143 ++++++++++++++++++++++++++++++--
drivers/gpu/drm/mediatek/mtk_dpi_regs.h | 5 ++
2 files changed, 141 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 508a6d994e83..8052b47042b8 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -14,7 +14,10 @@
#include <linux/of_graph.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/types.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>

#include <video/videomode.h>

@@ -65,10 +68,14 @@ struct mtk_dpi {
struct drm_bridge *next_bridge;
struct drm_connector *connector;
void __iomem *regs;
+ struct reset_control *reset_ctl;
struct device *dev;
struct clk *engine_clk;
+ struct clk *dpi_ck_cg;
struct clk *pixel_clk;
+ struct clk *dpi_sel_clk;
struct clk *tvd_clk;
+ struct clk *hdmi_cg;
int irq;
struct drm_display_mode mode;
const struct mtk_dpi_conf *conf;
@@ -134,6 +141,7 @@ struct mtk_dpi_yc_limit {
* @yuv422_en_bit: Enable bit of yuv422.
* @csc_enable_bit: Enable bit of CSC.
* @pixels_per_iter: Quantity of transferred pixels per iteration.
+ * @is_internal_hdmi: True if this DPI block is directly connected to SoC internal HDMI block
*/
struct mtk_dpi_conf {
unsigned int (*cal_factor)(int clock);
@@ -152,6 +160,7 @@ struct mtk_dpi_conf {
u32 yuv422_en_bit;
u32 csc_enable_bit;
u32 pixels_per_iter;
+ bool is_internal_hdmi;
};

static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
@@ -465,8 +474,15 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
pinctrl_select_state(dpi->pinctrl, dpi->pins_gpio);

mtk_dpi_disable(dpi);
+
+ reset_control_rearm(dpi->reset_ctl);
+
clk_disable_unprepare(dpi->pixel_clk);
clk_disable_unprepare(dpi->engine_clk);
+ clk_disable_unprepare(dpi->dpi_sel_clk);
+ clk_disable_unprepare(dpi->dpi_ck_cg);
+ clk_disable_unprepare(dpi->hdmi_cg);
+ clk_disable_unprepare(dpi->tvd_clk);
}

static int mtk_dpi_power_on(struct mtk_dpi *dpi)
@@ -482,12 +498,44 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
goto err_refcount;
}

+ ret = clk_prepare_enable(dpi->dpi_sel_clk);
+ if (ret) {
+ dev_err(dpi->dev, "failed to enable dpi_sel clock: %d\n", ret);
+ goto err_refcount;
+ }
+
+ ret = clk_prepare_enable(dpi->tvd_clk);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable tvd pll: %d\n", ret);
+ goto err_tvd;
+ }
+
+ ret = clk_prepare_enable(dpi->engine_clk);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
+ goto err_engine;
+ }
+
+ ret = clk_prepare_enable(dpi->hdmi_cg);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable hdmi_cg clock: %d\n", ret);
+ goto err_hdmi_cg;
+ }
+
+ ret = clk_prepare_enable(dpi->dpi_ck_cg);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable dpi_ck_cg clock: %d\n", ret);
+ goto err_ck_cg;
+ }
+
ret = clk_prepare_enable(dpi->pixel_clk);
if (ret) {
dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
goto err_pixel;
}

+ reset_control_reset(dpi->reset_ctl);
+
if (dpi->pinctrl && dpi->pins_dpi)
pinctrl_select_state(dpi->pinctrl, dpi->pins_dpi);

@@ -495,6 +543,15 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)

err_pixel:
clk_disable_unprepare(dpi->engine_clk);
+ clk_disable_unprepare(dpi->dpi_ck_cg);
+err_ck_cg:
+ clk_disable_unprepare(dpi->hdmi_cg);
+err_hdmi_cg:
+ clk_disable_unprepare(dpi->engine_clk);
+err_engine:
+ clk_disable_unprepare(dpi->tvd_clk);
+err_tvd:
+ clk_disable_unprepare(dpi->dpi_sel_clk);
err_refcount:
dpi->refcount--;
return ret;
@@ -538,7 +595,6 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
else
clk_set_rate(dpi->pixel_clk, vm.pixelclock);

-
vm.pixelclock = clk_get_rate(dpi->pixel_clk);

dev_dbg(dpi->dev, "Got PLL %lu Hz, pixel clock %lu Hz\n",
@@ -605,7 +661,16 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
if (dpi->conf->support_direct_pin) {
mtk_dpi_config_yc_map(dpi, dpi->yc_map);
mtk_dpi_config_2n_h_fre(dpi);
- mtk_dpi_dual_edge(dpi);
+ /* DPI could be connecting to external bridge
+ * or internal HDMI encoder. */
+ if (dpi->conf->is_internal_hdmi) {
+ mtk_dpi_mask(dpi, DPI_CON, DPI_OUTPUT_1T1P_EN,
+ DPI_OUTPUT_1T1P_EN);
+ mtk_dpi_mask(dpi, DPI_CON, DPI_INPUT_2P_EN,
+ DPI_INPUT_2P_EN);
+ } else {
+ mtk_dpi_dual_edge(dpi);
+ }
mtk_dpi_config_disable_edge(dpi);
}
if (dpi->conf->input_2pixel) {
@@ -720,7 +785,10 @@ static void mtk_dpi_bridge_disable(struct drm_bridge *bridge)
{
struct mtk_dpi *dpi = bridge_to_dpi(bridge);

- mtk_dpi_power_off(dpi);
+ if (dpi->conf->is_internal_hdmi)
+ mtk_dpi_power_off(dpi);
+ else
+ mtk_dpi_disable(dpi);
}

static void mtk_dpi_bridge_enable(struct drm_bridge *bridge)
@@ -763,14 +831,16 @@ void mtk_dpi_start(struct device *dev)
{
struct mtk_dpi *dpi = dev_get_drvdata(dev);

- mtk_dpi_power_on(dpi);
+ if (!dpi->conf->is_internal_hdmi)
+ mtk_dpi_power_on(dpi);
}

void mtk_dpi_stop(struct device *dev)
{
struct mtk_dpi *dpi = dev_get_drvdata(dev);

- mtk_dpi_power_off(dpi);
+ if (!dpi->conf->is_internal_hdmi)
+ mtk_dpi_power_off(dpi);
}

static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
@@ -853,6 +923,11 @@ static unsigned int mt8183_calculate_factor(int clock)
return 2;
}

+static unsigned int mt8195_calculate_factor(int clock)
+{
+ return 1;
+}
+
static unsigned int mt8195_dpintf_calculate_factor(int clock)
{
if (clock < 70000)
@@ -946,6 +1021,24 @@ static const struct mtk_dpi_conf mt8192_conf = {
.csc_enable_bit = CSC_ENABLE,
};

+static const struct mtk_dpi_conf mt8195_conf = {
+ .cal_factor = mt8195_calculate_factor,
+ .max_clock_khz = 594000,
+ .reg_h_fre_con = 0xe0,
+ .output_fmts = mt8183_output_fmts,
+ .num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
+ .pixels_per_iter = 1,
+ .is_ck_de_pol = true,
+ .swap_input_support = true,
+ .dimension_mask = HPW_MASK,
+ .hvsize_mask = HSIZE_MASK,
+ .channel_swap_shift = CH_SWAP,
+ .yuv422_en_bit = YUV422_EN,
+ .csc_enable_bit = CSC_ENABLE,
+ .is_internal_hdmi = true,
+ .support_direct_pin = true,
+};
+
static const struct mtk_dpi_conf mt8195_dpintf_conf = {
.cal_factor = mt8195_dpintf_calculate_factor,
.max_clock_khz = 600000,
@@ -1003,6 +1096,12 @@ static int mtk_dpi_probe(struct platform_device *pdev)
return ret;
}

+ dpi->reset_ctl = devm_reset_control_get_optional_exclusive(dev, "dpi_on");
+ if (IS_ERR(dpi->reset_ctl)) {
+ dev_err(dev, "Failed to get reset_ctl: %ld\n", PTR_ERR(dpi->reset_ctl));
+ return PTR_ERR(dpi->reset_ctl);
+ }
+
dpi->engine_clk = devm_clk_get(dev, "engine");
if (IS_ERR(dpi->engine_clk)) {
ret = PTR_ERR(dpi->engine_clk);
@@ -1012,7 +1111,26 @@ static int mtk_dpi_probe(struct platform_device *pdev)
return ret;
}

- dpi->pixel_clk = devm_clk_get(dev, "pixel");
+ dpi->hdmi_cg = devm_clk_get_optional(dev, "hdmi_cg");
+ if (IS_ERR(dpi->hdmi_cg)) {
+ ret = PTR_ERR(dpi->hdmi_cg);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get hdmi_cg clock: %d\n", ret);
+
+ return ret;
+ }
+
+ dpi->dpi_ck_cg = devm_clk_get_optional(dev, "ck_cg");
+ if (IS_ERR(dpi->dpi_ck_cg)) {
+ ret = PTR_ERR(dpi->dpi_ck_cg);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get dpi ck cg clock: %d\n",
+ ret);
+
+ return ret;
+ }
+
+ dpi->pixel_clk = devm_clk_get_optional(dev, "pixel");
if (IS_ERR(dpi->pixel_clk)) {
ret = PTR_ERR(dpi->pixel_clk);
if (ret != -EPROBE_DEFER)
@@ -1021,7 +1139,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
return ret;
}

- dpi->tvd_clk = devm_clk_get(dev, "pll");
+ dpi->tvd_clk = devm_clk_get_optional(dev, "pll");
if (IS_ERR(dpi->tvd_clk)) {
ret = PTR_ERR(dpi->tvd_clk);
if (ret != -EPROBE_DEFER)
@@ -1030,6 +1148,14 @@ static int mtk_dpi_probe(struct platform_device *pdev)
return ret;
}

+ dpi->dpi_sel_clk = devm_clk_get_optional(dev, "dpi_sel");
+ if (IS_ERR(dpi->dpi_sel_clk)) {
+ ret = PTR_ERR(dpi->dpi_sel_clk);
+ dev_err_probe(dev, ret, "Failed to get dpi_Sel_clk clock: %d\n", ret);
+
+ return ret;
+ }
+
dpi->irq = platform_get_irq(pdev, 0);
if (dpi->irq <= 0)
return -EINVAL;
@@ -1085,6 +1211,9 @@ static const struct of_device_id mtk_dpi_of_ids[] = {
{ .compatible = "mediatek,mt8195-dp-intf",
.data = &mt8195_dpintf_conf,
},
+ { .compatible = "mediatek,mt8195-dpi",
+ .data = &mt8195_conf,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, mtk_dpi_of_ids);
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
index 62bd4931b344..653ef4b93a97 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
+++ b/drivers/gpu/drm/mediatek/mtk_dpi_regs.h
@@ -43,6 +43,11 @@
#define DPINTF_YUV422_EN BIT(24)
#define DPINTF_CSC_ENABLE BIT(26)
#define DPINTF_INPUT_2P_EN BIT(29)
+#define DPI_OUTPUT_1T1P_EN BIT(24)
+#define DPI_INPUT_2P_EN BIT(25)
+#define DPI_EXT_VSYNC_EN BIT(26)
+#define DPI_RGB565_EN BIT(27)
+#define DPI_RGB880_EN BIT(28)

#define DPI_OUTPUT_SETTING 0x14
#define CH_SWAP 0

--
b4 0.11.0-dev