[v5 0/7] Support dsi for mt8183

[v5 0/7] Support dsi for mt8183

[Jitao Shi]

Change since v4:
 - move mipi_dsi_host_unregiter() to .remove()
 - fine tune add frame size control coding style
 - change the data type of data_rate as u32, and add DIV_ROUND_UP_ULL
 - use div_u64 when 8000000000ULL / dsi->data_rate.

Changes since v3
 - add one more 'tab' for bitwise define.
 - add Tested-by: Ryan Case <ryandcase@chromium.org>
	and Reviewed-by: CK Hu <ck.hu@mediatek.com>.
 - remove compare da_hs_zero to da_hs_prepare.

Changes since v2:
 - change the video timing calc method
 - fine the dsi and mipitx init sequence
 - fine tune commit msg

Changes since v1:
 - separate frame size and reg commit control independent patches.
 - fix some return values in probe
 - remove DSI_CMDW0 in "CMDQ reg address of mt8173 is different with mt2701" 

Jitao Shi (7):
  drm/mediatek: move mipi_dsi_host_register to probe
  drm/mediatek: fixes CMDQ reg address of mt8173 is different with
    mt2701
  drm/mediatek: add dsi reg commit disable control
  drm/mediatek: add frame size control
  drm/mediatek: add mt8183 dsi driver support
  drm/mediatek: change the dsi phytiming calculate method
  drm: mediatek: adjust dsi and mipi_tx probe sequence

 drivers/gpu/drm/mediatek/mtk_drm_drv.c |   2 +-
 drivers/gpu/drm/mediatek/mtk_dsi.c     | 223 ++++++++++++++++++-------
 2 files changed, 160 insertions(+), 65 deletions(-)

-- 
2.21.0


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[v5 1/7] drm/mediatek: move mipi_dsi_host_register to probe

[Jitao Shi]

DSI panel driver need attach function which is inculde in
mipi_dsi_host_ops.

If mipi_dsi_host_register is not in probe, dsi panel will
probe more delay.

So move the mipi_dsi_host_register to probe from bind.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 53 +++++++++++++++++-------------
 1 file changed, 31 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index b00eb2d2e086..595b3b047c7b 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -528,7 +528,7 @@ static s32 mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi, u8 irq_flag, u32 t)
 
 static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 {
-	struct device *dev = dsi->dev;
+	struct device *dev = dsi->->host.dev;
 	int ret;
 	u64 pixel_clock, total_bits;
 	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
@@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 	}
 
-	ret = mipi_dsi_host_register(&dsi->host);
-	if (ret < 0) {
-		dev_err(dev, "failed to register DSI host: %d\n", ret);
-		goto err_ddp_comp_unregister;
-	}
-
 	ret = mtk_dsi_create_conn_enc(drm, dsi);
 	if (ret) {
 		DRM_ERROR("Encoder create failed with %d\n", ret);
@@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_unregister:
-	mipi_dsi_host_unregister(&dsi->host);
-err_ddp_comp_unregister:
 	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
 	return ret;
 }
@@ -1073,7 +1065,6 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
 	struct mtk_dsi *dsi = dev_get_drvdata(dev);
 
 	mtk_dsi_destroy_conn_enc(dsi);
-	mipi_dsi_host_unregister(&dsi->host);
 	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
 }
 
@@ -1097,31 +1088,36 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 
 	dsi->host.ops = &mtk_dsi_ops;
 	dsi->host.dev = dev;
+	ret = mipi_dsi_host_register(&dsi->host);
+	if (ret < 0) {
+		dev_err(dev, "failed to register DSI host: %d\n", ret);
+		return ret;
+	}
 
 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
 					  &dsi->panel, &dsi->bridge);
 	if (ret)
-		return ret;
+		goto err_unregister_host;
 
 	dsi->engine_clk = devm_clk_get(dev, "engine");
 	if (IS_ERR(dsi->engine_clk)) {
 		ret = PTR_ERR(dsi->engine_clk);
 		dev_err(dev, "Failed to get engine clock: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	dsi->digital_clk = devm_clk_get(dev, "digital");
 	if (IS_ERR(dsi->digital_clk)) {
 		ret = PTR_ERR(dsi->digital_clk);
 		dev_err(dev, "Failed to get digital clock: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	dsi->hs_clk = devm_clk_get(dev, "hs");
 	if (IS_ERR(dsi->hs_clk)) {
 		ret = PTR_ERR(dsi->hs_clk);
 		dev_err(dev, "Failed to get hs clock: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1129,33 +1125,35 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 	if (IS_ERR(dsi->regs)) {
 		ret = PTR_ERR(dsi->regs);
 		dev_err(dev, "Failed to ioremap memory: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	dsi->phy = devm_phy_get(dev, "dphy");
 	if (IS_ERR(dsi->phy)) {
 		ret = PTR_ERR(dsi->phy);
 		dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
 	if (comp_id < 0) {
 		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
-		return comp_id;
+		ret = comp_id;
+		goto err_unregister_host;
 	}
 
 	ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
 				&mtk_dsi_funcs);
 	if (ret) {
 		dev_err(dev, "Failed to initialize component: %d\n", ret);
-		return ret;
+		goto err_unregister_host;
 	}
 
 	irq_num = platform_get_irq(pdev, 0);
 	if (irq_num < 0) {
-		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
-		return -EPROBE_DEFER;
+		dev_err(&pdev->dev, "failed to get dsi irq_num: %d\n", irq_num);
+		ret = irq_num;
+		goto err_unregister_host;
 	}
 
 	irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
@@ -1163,14 +1161,24 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 			       IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
-		return -EPROBE_DEFER;
+		goto err_unregister_host;
 	}
 
 	init_waitqueue_head(&dsi->irq_wait_queue);
 
 	platform_set_drvdata(pdev, dsi);
 
-	return component_add(&pdev->dev, &mtk_dsi_component_ops);
+	ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add component: %d\n", ret);
+		goto err_unregister_host;
+	}
+
+	return 0;
+
+err_unregister_host:
+	mipi_dsi_host_unregister(&dsi->host);
+	return ret;
 }
 
 static int mtk_dsi_remove(struct platform_device *pdev)
@@ -1179,6 +1187,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
 
 	mtk_output_dsi_disable(dsi);
 	component_del(&pdev->dev, &mtk_dsi_component_ops);
+	mipi_dsi_host_unregister(&dsi->host);
 
 	return 0;
 }
-- 
2.21.0


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[v5 2/7] drm/mediatek: fixes CMDQ reg address of mt8173 is different with mt2701

[Jitao Shi]

Config the different CMDQ reg address in driver data.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 595b3b047c7b..bd37d823c762 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -131,7 +131,6 @@
 #define VM_CMD_EN			BIT(0)
 #define TS_VFP_EN			BIT(5)
 
-#define DSI_CMDQ0		0x180
 #define CONFIG				(0xff << 0)
 #define SHORT_PACKET			0
 #define LONG_PACKET			2
@@ -156,6 +155,10 @@
 
 struct phy;
 
+struct mtk_dsi_driver_data {
+	const u32 reg_cmdq_off;
+};
+
 struct mtk_dsi {
 	struct mtk_ddp_comp ddp_comp;
 	struct device *dev;
@@ -182,6 +185,7 @@ struct mtk_dsi {
 	bool enabled;
 	u32 irq_data;
 	wait_queue_head_t irq_wait_queue;
+	const struct mtk_dsi_driver_data *driver_data;
 };
 
 static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
@@ -934,6 +938,7 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
 	const char *tx_buf = msg->tx_buf;
 	u8 config, cmdq_size, cmdq_off, type = msg->type;
 	u32 reg_val, cmdq_mask, i;
+	u32 reg_cmdq_off = dsi->driver_data->reg_cmdq_off;
 
 	if (MTK_DSI_HOST_IS_READ(type))
 		config = BTA;
@@ -953,9 +958,11 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
 	}
 
 	for (i = 0; i < msg->tx_len; i++)
-		writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + cmdq_off + i);
+		mtk_dsi_mask(dsi, (reg_cmdq_off + cmdq_off + i) & (~0x3U),
+			     (0xffUL << (((i + cmdq_off) & 3U) * 8U)),
+			     tx_buf[i] << (((i + cmdq_off) & 3U) * 8U));
 
-	mtk_dsi_mask(dsi, DSI_CMDQ0, cmdq_mask, reg_val);
+	mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);
 	mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
 }
 
@@ -1099,6 +1106,8 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_unregister_host;
 
+	dsi->driver_data = of_device_get_match_data(dev);
+
 	dsi->engine_clk = devm_clk_get(dev, "engine");
 	if (IS_ERR(dsi->engine_clk)) {
 		ret = PTR_ERR(dsi->engine_clk);
@@ -1192,9 +1201,19 @@ static int mtk_dsi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct mtk_dsi_driver_data mt8173_dsi_driver_data = {
+	.reg_cmdq_off = 0x200,
+};
+
+static const struct mtk_dsi_driver_data mt2701_dsi_driver_data = {
+	.reg_cmdq_off = 0x180,
+};
+
 static const struct of_device_id mtk_dsi_of_match[] = {
-	{ .compatible = "mediatek,mt2701-dsi" },
-	{ .compatible = "mediatek,mt8173-dsi" },
+	{ .compatible = "mediatek,mt2701-dsi",
+	  .data = &mt2701_dsi_driver_data },
+	{ .compatible = "mediatek,mt8173-dsi",
+	  .data = &mt8173_dsi_driver_data },
 	{ },
 };
 
-- 
2.21.0


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[v5 3/7] drm/mediatek: add dsi reg commit disable control

[Jitao Shi]

New DSI IP has shadow register and working reg. The register
values are writen to shadow register. And then trigger with
commit reg, the register values will be moved working register.

This fucntion is defualt on. But this driver doesn't use this
function. So add the disable control.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index bd37d823c762..6b6550926db6 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -131,6 +131,10 @@
 #define VM_CMD_EN			BIT(0)
 #define TS_VFP_EN			BIT(5)
 
+#define DSI_SHADOW_DEBUG	0x190U
+#define FORCE_COMMIT			BIT(0)
+#define BYPASS_SHADOW			BIT(1)
+
 #define CONFIG				(0xff << 0)
 #define SHORT_PACKET			0
 #define LONG_PACKET			2
@@ -157,6 +161,7 @@ struct phy;
 
 struct mtk_dsi_driver_data {
 	const u32 reg_cmdq_off;
+	bool has_shadow_ctl;
 };
 
 struct mtk_dsi {
@@ -594,6 +599,11 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 	}
 
 	mtk_dsi_enable(dsi);
+
+	if (dsi->driver_data->has_shadow_ctl)
+		writel(FORCE_COMMIT | BYPASS_SHADOW,
+		       dsi->regs + DSI_SHADOW_DEBUG);
+
 	mtk_dsi_reset_engine(dsi);
 	mtk_dsi_phy_timconfig(dsi);
 
-- 
2.21.0


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[v5 4/7] drm/mediatek: add frame size control

[Jitao Shi]

Our new DSI chip has frame size control.
So add the driver data to control for different chips.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 6b6550926db6..45e331055842 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -78,6 +78,7 @@
 #define DSI_VBP_NL		0x24
 #define DSI_VFP_NL		0x28
 #define DSI_VACT_NL		0x2C
+#define DSI_SIZE_CON		0x38
 #define DSI_HSA_WC		0x50
 #define DSI_HBP_WC		0x54
 #define DSI_HFP_WC		0x58
@@ -162,6 +163,7 @@ struct phy;
 struct mtk_dsi_driver_data {
 	const u32 reg_cmdq_off;
 	bool has_shadow_ctl;
+	bool has_size_ctl;
 };
 
 struct mtk_dsi {
@@ -430,6 +432,10 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 	writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
 	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
 
+	if (dsi->driver_data->has_size_ctl)
+		writel(vm->vactive << 16 | vm->hactive,
+		       dsi->regs + DSI_SIZE_CON);
+
 	horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
 
 	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
-- 
2.21.0


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[v5 5/7] drm/mediatek: add mt8183 dsi driver support

[Jitao Shi]

Add mt8183 dsi driver data. Enable size control and
reg commit control.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 45e331055842..1621e8cdacc2 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -1225,11 +1225,19 @@ static const struct mtk_dsi_driver_data mt2701_dsi_driver_data = {
 	.reg_cmdq_off = 0x180,
 };
 
+static const struct mtk_dsi_driver_data mt8183_dsi_driver_data = {
+	.reg_cmdq_off = 0x200,
+	.has_shadow_ctl = true,
+	.has_size_ctl = true,
+};
+
 static const struct of_device_id mtk_dsi_of_match[] = {
 	{ .compatible = "mediatek,mt2701-dsi",
 	  .data = &mt2701_dsi_driver_data },
 	{ .compatible = "mediatek,mt8173-dsi",
 	  .data = &mt8173_dsi_driver_data },
+	{ .compatible = "mediatek,mt8183-dsi",
+	  .data = &mt8183_dsi_driver_data },
 	{ },
 };
 
-- 
2.21.0


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[v5 6/7] drm/mediatek: change the dsi phytiming calculate method

[Jitao Shi]

Change the method of frame rate calc which can get more accurate
frame rate.

data rate = pixel_clock * bit_per_pixel / lanes
Adjust hfp_wc to adapt the additional phy_data

if MIPI_DSI_MODE_VIDEO_BURST
	hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12 - 6;
else
	hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12;

Note:
//(2: 1 for sync, 1 for phy idle)
data_phy_cycles = T_hs_exit + T_lpx + T_hs_prepare + T_hs_zero + 2;

bpp: bit per pixel

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Tested-by: Ryan Case <ryandcase@chromium.org>
Reviewed-by: CK Hu <ck.hu@mediatek.com
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 117 ++++++++++++++++++++---------
 1 file changed, 80 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 1621e8cdacc2..cefdcb1509cb 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -144,12 +144,6 @@
 #define DATA_0				(0xff << 16)
 #define DATA_1				(0xff << 24)
 
-#define T_LPX		5
-#define T_HS_PREP	6
-#define T_HS_TRAIL	8
-#define T_HS_EXIT	7
-#define T_HS_ZERO	10
-
 #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
 
 #define MTK_DSI_HOST_IS_READ(type) \
@@ -158,6 +152,25 @@
 	(type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
 	(type == MIPI_DSI_DCS_READ))
 
+struct mtk_phy_timing {
+	u32 lpx;
+	u32 da_hs_prepare;
+	u32 da_hs_zero;
+	u32 da_hs_trail;
+
+	u32 ta_go;
+	u32 ta_sure;
+	u32 ta_get;
+	u32 da_hs_exit;
+
+	u32 clk_hs_zero;
+	u32 clk_hs_trail;
+
+	u32 clk_hs_prepare;
+	u32 clk_hs_post;
+	u32 clk_hs_exit;
+};
+
 struct phy;
 
 struct mtk_dsi_driver_data {
@@ -188,6 +201,7 @@ struct mtk_dsi {
 	enum mipi_dsi_pixel_format format;
 	unsigned int lanes;
 	struct videomode vm;
+	struct mtk_phy_timing phy_timing;
 	int refcount;
 	bool enabled;
 	u32 irq_data;
@@ -221,17 +235,36 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
 {
 	u32 timcon0, timcon1, timcon2, timcon3;
 	u32 ui, cycle_time;
+	struct mtk_phy_timing *timing = &dsi->phy_timing;
+
+	ui = 1000000000 / dsi->data_rate;
+	cycle_time = div_u64(8000000000ULL, dsi->data_rate);
+
+	timing->lpx = NS_TO_CYCLE(60, cycle_time);
+	timing->da_hs_prepare = NS_TO_CYCLE(40 + 5 * ui, cycle_time);
+	timing->da_hs_zero = NS_TO_CYCLE(110 + 6 * ui, cycle_time);
+	timing->da_hs_trail = NS_TO_CYCLE(80 + 4 * ui, cycle_time);
 
-	ui = 1000 / dsi->data_rate + 0x01;
-	cycle_time = 8000 / dsi->data_rate + 0x01;
+	timing->ta_go = 4 * timing->lpx;
+	timing->ta_sure = 3 * timing->lpx / 2;
+	timing->ta_get = 5 * timing->lpx;
+	timing->da_hs_exit = 2 * timing->lpx;
 
-	timcon0 = T_LPX | T_HS_PREP << 8 | T_HS_ZERO << 16 | T_HS_TRAIL << 24;
-	timcon1 = 4 * T_LPX | (3 * T_LPX / 2) << 8 | 5 * T_LPX << 16 |
-		  T_HS_EXIT << 24;
-	timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
-		  (NS_TO_CYCLE(0x150, cycle_time) << 16);
-	timcon3 = NS_TO_CYCLE(0x40, cycle_time) | (2 * T_LPX) << 16 |
-		  NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8;
+	timing->clk_hs_zero = NS_TO_CYCLE(336, cycle_time);
+	timing->clk_hs_trail = NS_TO_CYCLE(100, cycle_time) + 10;
+
+	timing->clk_hs_prepare = NS_TO_CYCLE(64, cycle_time);
+	timing->clk_hs_post = NS_TO_CYCLE(80 + 52 * ui, cycle_time);
+	timing->clk_hs_exit = 2 * timing->lpx;
+
+	timcon0 = timing->lpx | timing->da_hs_prepare << 8 |
+		  timing->da_hs_zero << 16 | timing->da_hs_trail << 24;
+	timcon1 = timing->ta_go | timing->ta_sure << 8 |
+		  timing->ta_get << 16 | timing->da_hs_exit << 24;
+	timcon2 = 1 << 8 | timing->clk_hs_zero << 16 |
+		  timing->clk_hs_trail << 24;
+	timcon3 = timing->clk_hs_prepare | timing->clk_hs_post << 8 |
+		  timing->clk_hs_exit << 16;
 
 	writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
 	writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
@@ -418,7 +451,8 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 	u32 horizontal_sync_active_byte;
 	u32 horizontal_backporch_byte;
 	u32 horizontal_frontporch_byte;
-	u32 dsi_tmp_buf_bpp;
+	u32 dsi_tmp_buf_bpp, data_phy_cycles;
+	struct mtk_phy_timing *timing = &dsi->phy_timing;
 
 	struct videomode *vm = &dsi->vm;
 
@@ -445,7 +479,34 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 		horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
 			dsi_tmp_buf_bpp - 10);
 
-	horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
+	data_phy_cycles = timing->lpx + timing->da_hs_prepare +
+				  timing->da_hs_zero + timing->da_hs_exit + 2;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+		if (vm->hfront_porch * dsi_tmp_buf_bpp >
+		    data_phy_cycles * dsi->lanes + 18) {
+			horizontal_frontporch_byte = vm->hfront_porch *
+						     dsi_tmp_buf_bpp -
+						     data_phy_cycles *
+						     dsi->lanes - 18;
+		} else {
+			DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
+			horizontal_frontporch_byte = vm->hfront_porch *
+						     dsi_tmp_buf_bpp;
+		}
+	} else {
+		if (vm->hfront_porch * dsi_tmp_buf_bpp >
+		    data_phy_cycles * dsi->lanes + 12) {
+			horizontal_frontporch_byte = vm->hfront_porch *
+						     dsi_tmp_buf_bpp -
+						     data_phy_cycles *
+						     dsi->lanes - 12;
+		} else {
+			DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
+			horizontal_frontporch_byte = vm->hfront_porch *
+						     dsi_tmp_buf_bpp;
+		}
+	}
 
 	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
 	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
@@ -545,8 +606,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 {
 	struct device *dev = dsi->->host.dev;
 	int ret;
-	u64 pixel_clock, total_bits;
-	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
+	u32 bit_per_pixel;
 
 	if (++dsi->refcount != 1)
 		return 0;
@@ -565,24 +625,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 		break;
 	}
 
-	/**
-	 * htotal_time = htotal * byte_per_pixel / num_lanes
-	 * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
-	 * mipi_ratio = (htotal_time + overhead_time) / htotal_time
-	 * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
-	 */
-	pixel_clock = dsi->vm.pixelclock;
-	htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
-			dsi->vm.hsync_len;
-	htotal_bits = htotal * bit_per_pixel;
-
-	overhead_cycles = T_LPX + T_HS_PREP + T_HS_ZERO + T_HS_TRAIL +
-			T_HS_EXIT;
-	overhead_bits = overhead_cycles * dsi->lanes * 8;
-	total_bits = htotal_bits + overhead_bits;
-
-	dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
-					  htotal * dsi->lanes);
+	dsi->data_rate = DIV_ROUND_UP_ULL(dsi->vm.pixelclock * bit_per_pixel, dsi->lanes);
 
 	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
 	if (ret < 0) {
-- 
2.21.0


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[v5 7/7] drm: mediatek: adjust dsi and mipi_tx probe sequence

[Jitao Shi]

mtk_mipi_tx is the phy of mtk_dsi.
mtk_dsi get the phy(mtk_mipi_tx) in probe().

So,  mtk_mipi_tx init should be ahead of mtk_dsi. Or mtk_dsi will
defer to wait mtk_mipi_tx probe done.

Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 57ce4708ef1b..fc809a61fab9 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -640,8 +640,8 @@ static struct platform_driver * const mtk_drm_drivers[] = {
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
 	&mtk_drm_platform_driver,
-	&mtk_dsi_driver,
 	&mtk_mipi_tx_driver,
+	&mtk_dsi_driver,
 };
 
 static int __init mtk_drm_init(void)
-- 
2.21.0


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Re: [v5 2/7] drm/mediatek: fixes CMDQ reg address of mt8173 is different with mt2701

[CK Hu]

Hi, Jitao:

On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> Config the different CMDQ reg address in driver data.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 29 ++++++++++++++++++++++++-----
>  1 file changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 595b3b047c7b..bd37d823c762 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -131,7 +131,6 @@
>  #define VM_CMD_EN			BIT(0)
>  #define TS_VFP_EN			BIT(5)
>  
> -#define DSI_CMDQ0		0x180
>  #define CONFIG				(0xff << 0)
>  #define SHORT_PACKET			0
>  #define LONG_PACKET			2
> @@ -156,6 +155,10 @@
>  
>  struct phy;
>  
> +struct mtk_dsi_driver_data {
> +	const u32 reg_cmdq_off;
> +};
> +
>  struct mtk_dsi {
>  	struct mtk_ddp_comp ddp_comp;
>  	struct device *dev;
> @@ -182,6 +185,7 @@ struct mtk_dsi {
>  	bool enabled;
>  	u32 irq_data;
>  	wait_queue_head_t irq_wait_queue;
> +	const struct mtk_dsi_driver_data *driver_data;
>  };
>  
>  static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
> @@ -934,6 +938,7 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
>  	const char *tx_buf = msg->tx_buf;
>  	u8 config, cmdq_size, cmdq_off, type = msg->type;
>  	u32 reg_val, cmdq_mask, i;
> +	u32 reg_cmdq_off = dsi->driver_data->reg_cmdq_off;
>  
>  	if (MTK_DSI_HOST_IS_READ(type))
>  		config = BTA;
> @@ -953,9 +958,11 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
>  	}
>  
>  	for (i = 0; i < msg->tx_len; i++)
> -		writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + cmdq_off + i);
> +		mtk_dsi_mask(dsi, (reg_cmdq_off + cmdq_off + i) & (~0x3U),
> +			     (0xffUL << (((i + cmdq_off) & 3U) * 8U)),
> +			     tx_buf[i] << (((i + cmdq_off) & 3U) * 8U));

If writeb() has the same problem in MT2701, I think we need a patch that
just change writeb() to mtk_dsi_mask(), and then a patch to fix CMDQ reg
address of MT8173. So break this patch into two patches.

Regards,
CK

>  
> -	mtk_dsi_mask(dsi, DSI_CMDQ0, cmdq_mask, reg_val);
> +	mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);
>  	mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
>  }
>  
> @@ -1099,6 +1106,8 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_unregister_host;
>  
> +	dsi->driver_data = of_device_get_match_data(dev);
> +
>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>  	if (IS_ERR(dsi->engine_clk)) {
>  		ret = PTR_ERR(dsi->engine_clk);
> @@ -1192,9 +1201,19 @@ static int mtk_dsi_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct mtk_dsi_driver_data mt8173_dsi_driver_data = {
> +	.reg_cmdq_off = 0x200,
> +};
> +
> +static const struct mtk_dsi_driver_data mt2701_dsi_driver_data = {
> +	.reg_cmdq_off = 0x180,
> +};
> +
>  static const struct of_device_id mtk_dsi_of_match[] = {
> -	{ .compatible = "mediatek,mt2701-dsi" },
> -	{ .compatible = "mediatek,mt8173-dsi" },
> +	{ .compatible = "mediatek,mt2701-dsi",
> +	  .data = &mt2701_dsi_driver_data },
> +	{ .compatible = "mediatek,mt8173-dsi",
> +	  .data = &mt8173_dsi_driver_data },
>  	{ },
>  };
>  



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Re: [v5 1/7] drm/mediatek: move mipi_dsi_host_register to probe

[CK Hu]

Hi, Jitao:

On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> DSI panel driver need attach function which is inculde in
> mipi_dsi_host_ops.
> 
> If mipi_dsi_host_register is not in probe, dsi panel will
> probe more delay.
> 
> So move the mipi_dsi_host_register to probe from bind.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>

This version is different than v4, so please remove reviewed-by tag when
this patch change. When I see a reviewed-by tag of mine, I would just
skip review it again because I assume this patch is the same as previous
version.

For this version, I give still give it a

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 53 +++++++++++++++++-------------
>  1 file changed, 31 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index b00eb2d2e086..595b3b047c7b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -528,7 +528,7 @@ static s32 mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi, u8 irq_flag, u32 t)
>  
>  static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  {
> -	struct device *dev = dsi->dev;
> +	struct device *dev = dsi->->host.dev;
>  	int ret;
>  	u64 pixel_clock, total_bits;
>  	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
> @@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>  		return ret;
>  	}
>  
> -	ret = mipi_dsi_host_register(&dsi->host);
> -	if (ret < 0) {
> -		dev_err(dev, "failed to register DSI host: %d\n", ret);
> -		goto err_ddp_comp_unregister;
> -	}
> -
>  	ret = mtk_dsi_create_conn_enc(drm, dsi);
>  	if (ret) {
>  		DRM_ERROR("Encoder create failed with %d\n", ret);
> @@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
>  	return 0;
>  
>  err_unregister:
> -	mipi_dsi_host_unregister(&dsi->host);
> -err_ddp_comp_unregister:
>  	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
>  	return ret;
>  }
> @@ -1073,7 +1065,6 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
>  	struct mtk_dsi *dsi = dev_get_drvdata(dev);
>  
>  	mtk_dsi_destroy_conn_enc(dsi);
> -	mipi_dsi_host_unregister(&dsi->host);
>  	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
>  }
>  
> @@ -1097,31 +1088,36 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  
>  	dsi->host.ops = &mtk_dsi_ops;
>  	dsi->host.dev = dev;
> +	ret = mipi_dsi_host_register(&dsi->host);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to register DSI host: %d\n", ret);
> +		return ret;
> +	}
>  
>  	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
>  					  &dsi->panel, &dsi->bridge);
>  	if (ret)
> -		return ret;
> +		goto err_unregister_host;
>  
>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>  	if (IS_ERR(dsi->engine_clk)) {
>  		ret = PTR_ERR(dsi->engine_clk);
>  		dev_err(dev, "Failed to get engine clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->digital_clk = devm_clk_get(dev, "digital");
>  	if (IS_ERR(dsi->digital_clk)) {
>  		ret = PTR_ERR(dsi->digital_clk);
>  		dev_err(dev, "Failed to get digital clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->hs_clk = devm_clk_get(dev, "hs");
>  	if (IS_ERR(dsi->hs_clk)) {
>  		ret = PTR_ERR(dsi->hs_clk);
>  		dev_err(dev, "Failed to get hs clock: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -1129,33 +1125,35 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  	if (IS_ERR(dsi->regs)) {
>  		ret = PTR_ERR(dsi->regs);
>  		dev_err(dev, "Failed to ioremap memory: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	dsi->phy = devm_phy_get(dev, "dphy");
>  	if (IS_ERR(dsi->phy)) {
>  		ret = PTR_ERR(dsi->phy);
>  		dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
>  	if (comp_id < 0) {
>  		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> -		return comp_id;
> +		ret = comp_id;
> +		goto err_unregister_host;
>  	}
>  
>  	ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
>  				&mtk_dsi_funcs);
>  	if (ret) {
>  		dev_err(dev, "Failed to initialize component: %d\n", ret);
> -		return ret;
> +		goto err_unregister_host;
>  	}
>  
>  	irq_num = platform_get_irq(pdev, 0);
>  	if (irq_num < 0) {
> -		dev_err(&pdev->dev, "failed to request dsi irq resource\n");
> -		return -EPROBE_DEFER;
> +		dev_err(&pdev->dev, "failed to get dsi irq_num: %d\n", irq_num);
> +		ret = irq_num;
> +		goto err_unregister_host;
>  	}
>  
>  	irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
> @@ -1163,14 +1161,24 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  			       IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
> -		return -EPROBE_DEFER;
> +		goto err_unregister_host;
>  	}
>  
>  	init_waitqueue_head(&dsi->irq_wait_queue);
>  
>  	platform_set_drvdata(pdev, dsi);
>  
> -	return component_add(&pdev->dev, &mtk_dsi_component_ops);
> +	ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to add component: %d\n", ret);
> +		goto err_unregister_host;
> +	}
> +
> +	return 0;
> +
> +err_unregister_host:
> +	mipi_dsi_host_unregister(&dsi->host);
> +	return ret;
>  }
>  
>  static int mtk_dsi_remove(struct platform_device *pdev)
> @@ -1179,6 +1187,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
>  
>  	mtk_output_dsi_disable(dsi);
>  	component_del(&pdev->dev, &mtk_dsi_component_ops);
> +	mipi_dsi_host_unregister(&dsi->host);
>  
>  	return 0;
>  }



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Re: [v5 4/7] drm/mediatek: add frame size control

[CK Hu]

Hi, Jitao:

On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> Our new DSI chip has frame size control.
> So add the driver data to control for different chips.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>

This version is different than previous version, so you should remove
the reviewed-by tag. For this version, I still give you a

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 6b6550926db6..45e331055842 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -78,6 +78,7 @@
>  #define DSI_VBP_NL		0x24
>  #define DSI_VFP_NL		0x28
>  #define DSI_VACT_NL		0x2C
> +#define DSI_SIZE_CON		0x38
>  #define DSI_HSA_WC		0x50
>  #define DSI_HBP_WC		0x54
>  #define DSI_HFP_WC		0x58
> @@ -162,6 +163,7 @@ struct phy;
>  struct mtk_dsi_driver_data {
>  	const u32 reg_cmdq_off;
>  	bool has_shadow_ctl;
> +	bool has_size_ctl;
>  };
>  
>  struct mtk_dsi {
> @@ -430,6 +432,10 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>  	writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
>  	writel(vm->vactive, dsi->regs + DSI_VACT_NL);
>  
> +	if (dsi->driver_data->has_size_ctl)
> +		writel(vm->vactive << 16 | vm->hactive,
> +		       dsi->regs + DSI_SIZE_CON);
> +
>  	horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
>  
>  	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)



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Re: [v5 6/7] drm/mediatek: change the dsi phytiming calculate method

[CK Hu]

Hi, Jitao:

On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> Change the method of frame rate calc which can get more accurate
> frame rate.
> 
> data rate = pixel_clock * bit_per_pixel / lanes
> Adjust hfp_wc to adapt the additional phy_data
> 
> if MIPI_DSI_MODE_VIDEO_BURST
> 	hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12 - 6;
> else
> 	hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12;
> 
> Note:
> //(2: 1 for sync, 1 for phy idle)
> data_phy_cycles = T_hs_exit + T_lpx + T_hs_prepare + T_hs_zero + 2;
> 
> bpp: bit per pixel
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Tested-by: Ryan Case <ryandcase@chromium.org>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>

This version is different than previous version, so you should remove
Reviewed-by tag. For this version, I still give you a

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 117 ++++++++++++++++++++---------
>  1 file changed, 80 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 1621e8cdacc2..cefdcb1509cb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -144,12 +144,6 @@
>  #define DATA_0				(0xff << 16)
>  #define DATA_1				(0xff << 24)
>  
> -#define T_LPX		5
> -#define T_HS_PREP	6
> -#define T_HS_TRAIL	8
> -#define T_HS_EXIT	7
> -#define T_HS_ZERO	10
> -
>  #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
>  
>  #define MTK_DSI_HOST_IS_READ(type) \
> @@ -158,6 +152,25 @@
>  	(type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
>  	(type == MIPI_DSI_DCS_READ))
>  
> +struct mtk_phy_timing {
> +	u32 lpx;
> +	u32 da_hs_prepare;
> +	u32 da_hs_zero;
> +	u32 da_hs_trail;
> +
> +	u32 ta_go;
> +	u32 ta_sure;
> +	u32 ta_get;
> +	u32 da_hs_exit;
> +
> +	u32 clk_hs_zero;
> +	u32 clk_hs_trail;
> +
> +	u32 clk_hs_prepare;
> +	u32 clk_hs_post;
> +	u32 clk_hs_exit;
> +};
> +
>  struct phy;
>  
>  struct mtk_dsi_driver_data {
> @@ -188,6 +201,7 @@ struct mtk_dsi {
>  	enum mipi_dsi_pixel_format format;
>  	unsigned int lanes;
>  	struct videomode vm;
> +	struct mtk_phy_timing phy_timing;
>  	int refcount;
>  	bool enabled;
>  	u32 irq_data;
> @@ -221,17 +235,36 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
>  {
>  	u32 timcon0, timcon1, timcon2, timcon3;
>  	u32 ui, cycle_time;
> +	struct mtk_phy_timing *timing = &dsi->phy_timing;
> +
> +	ui = 1000000000 / dsi->data_rate;
> +	cycle_time = div_u64(8000000000ULL, dsi->data_rate);
> +
> +	timing->lpx = NS_TO_CYCLE(60, cycle_time);
> +	timing->da_hs_prepare = NS_TO_CYCLE(40 + 5 * ui, cycle_time);
> +	timing->da_hs_zero = NS_TO_CYCLE(110 + 6 * ui, cycle_time);
> +	timing->da_hs_trail = NS_TO_CYCLE(80 + 4 * ui, cycle_time);
>  
> -	ui = 1000 / dsi->data_rate + 0x01;
> -	cycle_time = 8000 / dsi->data_rate + 0x01;
> +	timing->ta_go = 4 * timing->lpx;
> +	timing->ta_sure = 3 * timing->lpx / 2;
> +	timing->ta_get = 5 * timing->lpx;
> +	timing->da_hs_exit = 2 * timing->lpx;
>  
> -	timcon0 = T_LPX | T_HS_PREP << 8 | T_HS_ZERO << 16 | T_HS_TRAIL << 24;
> -	timcon1 = 4 * T_LPX | (3 * T_LPX / 2) << 8 | 5 * T_LPX << 16 |
> -		  T_HS_EXIT << 24;
> -	timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
> -		  (NS_TO_CYCLE(0x150, cycle_time) << 16);
> -	timcon3 = NS_TO_CYCLE(0x40, cycle_time) | (2 * T_LPX) << 16 |
> -		  NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8;
> +	timing->clk_hs_zero = NS_TO_CYCLE(336, cycle_time);
> +	timing->clk_hs_trail = NS_TO_CYCLE(100, cycle_time) + 10;
> +
> +	timing->clk_hs_prepare = NS_TO_CYCLE(64, cycle_time);
> +	timing->clk_hs_post = NS_TO_CYCLE(80 + 52 * ui, cycle_time);
> +	timing->clk_hs_exit = 2 * timing->lpx;
> +
> +	timcon0 = timing->lpx | timing->da_hs_prepare << 8 |
> +		  timing->da_hs_zero << 16 | timing->da_hs_trail << 24;
> +	timcon1 = timing->ta_go | timing->ta_sure << 8 |
> +		  timing->ta_get << 16 | timing->da_hs_exit << 24;
> +	timcon2 = 1 << 8 | timing->clk_hs_zero << 16 |
> +		  timing->clk_hs_trail << 24;
> +	timcon3 = timing->clk_hs_prepare | timing->clk_hs_post << 8 |
> +		  timing->clk_hs_exit << 16;
>  
>  	writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
>  	writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
> @@ -418,7 +451,8 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>  	u32 horizontal_sync_active_byte;
>  	u32 horizontal_backporch_byte;
>  	u32 horizontal_frontporch_byte;
> -	u32 dsi_tmp_buf_bpp;
> +	u32 dsi_tmp_buf_bpp, data_phy_cycles;
> +	struct mtk_phy_timing *timing = &dsi->phy_timing;
>  
>  	struct videomode *vm = &dsi->vm;
>  
> @@ -445,7 +479,34 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>  		horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
>  			dsi_tmp_buf_bpp - 10);
>  
> -	horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
> +	data_phy_cycles = timing->lpx + timing->da_hs_prepare +
> +				  timing->da_hs_zero + timing->da_hs_exit + 2;
> +
> +	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
> +		if (vm->hfront_porch * dsi_tmp_buf_bpp >
> +		    data_phy_cycles * dsi->lanes + 18) {
> +			horizontal_frontporch_byte = vm->hfront_porch *
> +						     dsi_tmp_buf_bpp -
> +						     data_phy_cycles *
> +						     dsi->lanes - 18;
> +		} else {
> +			DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
> +			horizontal_frontporch_byte = vm->hfront_porch *
> +						     dsi_tmp_buf_bpp;
> +		}
> +	} else {
> +		if (vm->hfront_porch * dsi_tmp_buf_bpp >
> +		    data_phy_cycles * dsi->lanes + 12) {
> +			horizontal_frontporch_byte = vm->hfront_porch *
> +						     dsi_tmp_buf_bpp -
> +						     data_phy_cycles *
> +						     dsi->lanes - 12;
> +		} else {
> +			DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
> +			horizontal_frontporch_byte = vm->hfront_porch *
> +						     dsi_tmp_buf_bpp;
> +		}
> +	}
>  
>  	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
>  	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
> @@ -545,8 +606,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  {
>  	struct device *dev = dsi->->host.dev;
>  	int ret;
> -	u64 pixel_clock, total_bits;
> -	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
> +	u32 bit_per_pixel;
>  
>  	if (++dsi->refcount != 1)
>  		return 0;
> @@ -565,24 +625,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
>  		break;
>  	}
>  
> -	/**
> -	 * htotal_time = htotal * byte_per_pixel / num_lanes
> -	 * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
> -	 * mipi_ratio = (htotal_time + overhead_time) / htotal_time
> -	 * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
> -	 */
> -	pixel_clock = dsi->vm.pixelclock;
> -	htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
> -			dsi->vm.hsync_len;
> -	htotal_bits = htotal * bit_per_pixel;
> -
> -	overhead_cycles = T_LPX + T_HS_PREP + T_HS_ZERO + T_HS_TRAIL +
> -			T_HS_EXIT;
> -	overhead_bits = overhead_cycles * dsi->lanes * 8;
> -	total_bits = htotal_bits + overhead_bits;
> -
> -	dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
> -					  htotal * dsi->lanes);
> +	dsi->data_rate = DIV_ROUND_UP_ULL(dsi->vm.pixelclock * bit_per_pixel, dsi->lanes);
>  
>  	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
>  	if (ret < 0) {



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Re: [v5 1/7] drm/mediatek: move mipi_dsi_host_register to probe

[Ryan Case]

On Thu, Jun 27, 2019 at 11:11 PM CK Hu <ck.hu@mediatek.com> wrote:
>
> Hi, Jitao:
>
> On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> > DSI panel driver need attach function which is inculde in
> > mipi_dsi_host_ops.
> >
> > If mipi_dsi_host_register is not in probe, dsi panel will
> > probe more delay.
> >
> > So move the mipi_dsi_host_register to probe from bind.
> >
> > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> > Reviewed-by: CK Hu <ck.hu@mediatek.com>
>
> This version is different than v4, so please remove reviewed-by tag when
> this patch change. When I see a reviewed-by tag of mine, I would just
> skip review it again because I assume this patch is the same as previous
> version.
>
> For this version, I give still give it a
>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 53 +++++++++++++++++-------------
> >  1 file changed, 31 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index b00eb2d2e086..595b3b047c7b 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -528,7 +528,7 @@ static s32 mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi, u8 irq_flag, u32 t)
> >
> >  static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> >  {
> > -     struct device *dev = dsi->dev;
> > +     struct device *dev = dsi->->host.dev;

single -> here

> >       int ret;
> >       u64 pixel_clock, total_bits;
> >       u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
> > @@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> >               return ret;
> >       }
> >
> > -     ret = mipi_dsi_host_register(&dsi->host);
> > -     if (ret < 0) {
> > -             dev_err(dev, "failed to register DSI host: %d\n", ret);
> > -             goto err_ddp_comp_unregister;
> > -     }
> > -
> >       ret = mtk_dsi_create_conn_enc(drm, dsi);
> >       if (ret) {
> >               DRM_ERROR("Encoder create failed with %d\n", ret);
> > @@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> >       return 0;
> >
> >  err_unregister:
> > -     mipi_dsi_host_unregister(&dsi->host);
> > -err_ddp_comp_unregister:
> >       mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
> >       return ret;
> >  }
> > @@ -1073,7 +1065,6 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
> >       struct mtk_dsi *dsi = dev_get_drvdata(dev);
> >
> >       mtk_dsi_destroy_conn_enc(dsi);
> > -     mipi_dsi_host_unregister(&dsi->host);
> >       mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
> >  }
> >
> > @@ -1097,31 +1088,36 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> >
> >       dsi->host.ops = &mtk_dsi_ops;
> >       dsi->host.dev = dev;
> > +     ret = mipi_dsi_host_register(&dsi->host);
> > +     if (ret < 0) {
> > +             dev_err(dev, "failed to register DSI host: %d\n", ret);
> > +             return ret;
> > +     }
> >
> >       ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> >                                         &dsi->panel, &dsi->bridge);
> >       if (ret)
> > -             return ret;
> > +             goto err_unregister_host;
> >
> >       dsi->engine_clk = devm_clk_get(dev, "engine");
> >       if (IS_ERR(dsi->engine_clk)) {
> >               ret = PTR_ERR(dsi->engine_clk);
> >               dev_err(dev, "Failed to get engine clock: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       dsi->digital_clk = devm_clk_get(dev, "digital");
> >       if (IS_ERR(dsi->digital_clk)) {
> >               ret = PTR_ERR(dsi->digital_clk);
> >               dev_err(dev, "Failed to get digital clock: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       dsi->hs_clk = devm_clk_get(dev, "hs");
> >       if (IS_ERR(dsi->hs_clk)) {
> >               ret = PTR_ERR(dsi->hs_clk);
> >               dev_err(dev, "Failed to get hs clock: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > @@ -1129,33 +1125,35 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> >       if (IS_ERR(dsi->regs)) {
> >               ret = PTR_ERR(dsi->regs);
> >               dev_err(dev, "Failed to ioremap memory: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       dsi->phy = devm_phy_get(dev, "dphy");
> >       if (IS_ERR(dsi->phy)) {
> >               ret = PTR_ERR(dsi->phy);
> >               dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
> >       if (comp_id < 0) {
> >               dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
> > -             return comp_id;
> > +             ret = comp_id;
> > +             goto err_unregister_host;
> >       }
> >
> >       ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
> >                               &mtk_dsi_funcs);
> >       if (ret) {
> >               dev_err(dev, "Failed to initialize component: %d\n", ret);
> > -             return ret;
> > +             goto err_unregister_host;
> >       }
> >
> >       irq_num = platform_get_irq(pdev, 0);
> >       if (irq_num < 0) {
> > -             dev_err(&pdev->dev, "failed to request dsi irq resource\n");
> > -             return -EPROBE_DEFER;
> > +             dev_err(&pdev->dev, "failed to get dsi irq_num: %d\n", irq_num);
> > +             ret = irq_num;
> > +             goto err_unregister_host;
> >       }
> >
> >       irq_set_status_flags(irq_num, IRQ_TYPE_LEVEL_LOW);
> > @@ -1163,14 +1161,24 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> >                              IRQF_TRIGGER_LOW, dev_name(&pdev->dev), dsi);
> >       if (ret) {
> >               dev_err(&pdev->dev, "failed to request mediatek dsi irq\n");
> > -             return -EPROBE_DEFER;
> > +             goto err_unregister_host;
> >       }
> >
> >       init_waitqueue_head(&dsi->irq_wait_queue);
> >
> >       platform_set_drvdata(pdev, dsi);
> >
> > -     return component_add(&pdev->dev, &mtk_dsi_component_ops);
> > +     ret = component_add(&pdev->dev, &mtk_dsi_component_ops);
> > +     if (ret) {
> > +             dev_err(&pdev->dev, "failed to add component: %d\n", ret);
> > +             goto err_unregister_host;
> > +     }
> > +
> > +     return 0;
> > +
> > +err_unregister_host:
> > +     mipi_dsi_host_unregister(&dsi->host);
> > +     return ret;
> >  }
> >
> >  static int mtk_dsi_remove(struct platform_device *pdev)
> > @@ -1179,6 +1187,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
> >
> >       mtk_output_dsi_disable(dsi);
> >       component_del(&pdev->dev, &mtk_dsi_component_ops);
> > +     mipi_dsi_host_unregister(&dsi->host);
> >
> >       return 0;
> >  }
>
>
>
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Re: [v5 6/7] drm/mediatek: change the dsi phytiming calculate method

[Ryan Case]

On Sun, Jun 30, 2019 at 6:43 PM CK Hu <ck.hu@mediatek.com> wrote:
>
> Hi, Jitao:
>
> On Thu, 2019-06-27 at 16:01 +0800, Jitao Shi wrote:
> > Change the method of frame rate calc which can get more accurate
> > frame rate.
> >
> > data rate = pixel_clock * bit_per_pixel / lanes
> > Adjust hfp_wc to adapt the additional phy_data
> >
> > if MIPI_DSI_MODE_VIDEO_BURST
> >       hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12 - 6;
> > else
> >       hfp_wc = hfp * bpp - data_phy_cycles * lanes - 12;
> >
> > Note:
> > //(2: 1 for sync, 1 for phy idle)
> > data_phy_cycles = T_hs_exit + T_lpx + T_hs_prepare + T_hs_zero + 2;
> >
> > bpp: bit per pixel
> >
> > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> > Tested-by: Ryan Case <ryandcase@chromium.org>
> > Reviewed-by: CK Hu <ck.hu@mediatek.com>
>
> This version is different than previous version, so you should remove
> Reviewed-by tag. For this version, I still give you a
>
> Reviewed-by: CK Hu <ck.hu@mediatek.com>
>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 117 ++++++++++++++++++++---------
> >  1 file changed, 80 insertions(+), 37 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index 1621e8cdacc2..cefdcb1509cb 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -144,12 +144,6 @@
> >  #define DATA_0                               (0xff << 16)
> >  #define DATA_1                               (0xff << 24)
> >
> > -#define T_LPX                5
> > -#define T_HS_PREP    6
> > -#define T_HS_TRAIL   8
> > -#define T_HS_EXIT    7
> > -#define T_HS_ZERO    10
> > -
> >  #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
> >
> >  #define MTK_DSI_HOST_IS_READ(type) \
> > @@ -158,6 +152,25 @@
> >       (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
> >       (type == MIPI_DSI_DCS_READ))
> >
> > +struct mtk_phy_timing {
> > +     u32 lpx;
> > +     u32 da_hs_prepare;
> > +     u32 da_hs_zero;
> > +     u32 da_hs_trail;
> > +
> > +     u32 ta_go;
> > +     u32 ta_sure;
> > +     u32 ta_get;
> > +     u32 da_hs_exit;
> > +
> > +     u32 clk_hs_zero;
> > +     u32 clk_hs_trail;
> > +
> > +     u32 clk_hs_prepare;
> > +     u32 clk_hs_post;
> > +     u32 clk_hs_exit;
> > +};
> > +
> >  struct phy;
> >
> >  struct mtk_dsi_driver_data {
> > @@ -188,6 +201,7 @@ struct mtk_dsi {
> >       enum mipi_dsi_pixel_format format;
> >       unsigned int lanes;
> >       struct videomode vm;
> > +     struct mtk_phy_timing phy_timing;
> >       int refcount;
> >       bool enabled;
> >       u32 irq_data;
> > @@ -221,17 +235,36 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
> >  {
> >       u32 timcon0, timcon1, timcon2, timcon3;
> >       u32 ui, cycle_time;
> > +     struct mtk_phy_timing *timing = &dsi->phy_timing;
> > +
> > +     ui = 1000000000 / dsi->data_rate;
> > +     cycle_time = div_u64(8000000000ULL, dsi->data_rate);
> > +
> > +     timing->lpx = NS_TO_CYCLE(60, cycle_time);
> > +     timing->da_hs_prepare = NS_TO_CYCLE(40 + 5 * ui, cycle_time);
> > +     timing->da_hs_zero = NS_TO_CYCLE(110 + 6 * ui, cycle_time);
> > +     timing->da_hs_trail = NS_TO_CYCLE(80 + 4 * ui, cycle_time);
> >
> > -     ui = 1000 / dsi->data_rate + 0x01;
> > -     cycle_time = 8000 / dsi->data_rate + 0x01;
> > +     timing->ta_go = 4 * timing->lpx;
> > +     timing->ta_sure = 3 * timing->lpx / 2;
> > +     timing->ta_get = 5 * timing->lpx;
> > +     timing->da_hs_exit = 2 * timing->lpx;
> >
> > -     timcon0 = T_LPX | T_HS_PREP << 8 | T_HS_ZERO << 16 | T_HS_TRAIL << 24;
> > -     timcon1 = 4 * T_LPX | (3 * T_LPX / 2) << 8 | 5 * T_LPX << 16 |
> > -               T_HS_EXIT << 24;
> > -     timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
> > -               (NS_TO_CYCLE(0x150, cycle_time) << 16);
> > -     timcon3 = NS_TO_CYCLE(0x40, cycle_time) | (2 * T_LPX) << 16 |
> > -               NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8;
> > +     timing->clk_hs_zero = NS_TO_CYCLE(336, cycle_time);
> > +     timing->clk_hs_trail = NS_TO_CYCLE(100, cycle_time) + 10;
> > +
> > +     timing->clk_hs_prepare = NS_TO_CYCLE(64, cycle_time);
> > +     timing->clk_hs_post = NS_TO_CYCLE(80 + 52 * ui, cycle_time);
> > +     timing->clk_hs_exit = 2 * timing->lpx;
> > +
> > +     timcon0 = timing->lpx | timing->da_hs_prepare << 8 |
> > +               timing->da_hs_zero << 16 | timing->da_hs_trail << 24;
> > +     timcon1 = timing->ta_go | timing->ta_sure << 8 |
> > +               timing->ta_get << 16 | timing->da_hs_exit << 24;
> > +     timcon2 = 1 << 8 | timing->clk_hs_zero << 16 |
> > +               timing->clk_hs_trail << 24;
> > +     timcon3 = timing->clk_hs_prepare | timing->clk_hs_post << 8 |
> > +               timing->clk_hs_exit << 16;
> >
> >       writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
> >       writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
> > @@ -418,7 +451,8 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
> >       u32 horizontal_sync_active_byte;
> >       u32 horizontal_backporch_byte;
> >       u32 horizontal_frontporch_byte;
> > -     u32 dsi_tmp_buf_bpp;
> > +     u32 dsi_tmp_buf_bpp, data_phy_cycles;
> > +     struct mtk_phy_timing *timing = &dsi->phy_timing;
> >
> >       struct videomode *vm = &dsi->vm;
> >
> > @@ -445,7 +479,34 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
> >               horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
> >                       dsi_tmp_buf_bpp - 10);
> >
> > -     horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
> > +     data_phy_cycles = timing->lpx + timing->da_hs_prepare +
> > +                               timing->da_hs_zero + timing->da_hs_exit + 2;
> > +
> > +     if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
> > +             if (vm->hfront_porch * dsi_tmp_buf_bpp >
> > +                 data_phy_cycles * dsi->lanes + 18) {
> > +                     horizontal_frontporch_byte = vm->hfront_porch *
> > +                                                  dsi_tmp_buf_bpp -
> > +                                                  data_phy_cycles *
> > +                                                  dsi->lanes - 18;
> > +             } else {
> > +                     DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
> > +                     horizontal_frontporch_byte = vm->hfront_porch *
> > +                                                  dsi_tmp_buf_bpp;
> > +             }
> > +     } else {
> > +             if (vm->hfront_porch * dsi_tmp_buf_bpp >
> > +                 data_phy_cycles * dsi->lanes + 12) {
> > +                     horizontal_frontporch_byte = vm->hfront_porch *
> > +                                                  dsi_tmp_buf_bpp -
> > +                                                  data_phy_cycles *
> > +                                                  dsi->lanes - 12;
> > +             } else {
> > +                     DRM_WARN("HFP less than d-phy, FPS will under 60Hz\n");
> > +                     horizontal_frontporch_byte = vm->hfront_porch *
> > +                                                  dsi_tmp_buf_bpp;
> > +             }
> > +     }
> >
> >       writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
> >       writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
> > @@ -545,8 +606,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> >  {
> >       struct device *dev = dsi->->host.dev;
> >       int ret;
> > -     u64 pixel_clock, total_bits;
> > -     u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;
> > +     u32 bit_per_pixel;
> >
> >       if (++dsi->refcount != 1)
> >               return 0;
> > @@ -565,24 +625,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
> >               break;
> >       }
> >
> > -     /**
> > -      * htotal_time = htotal * byte_per_pixel / num_lanes
> > -      * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
> > -      * mipi_ratio = (htotal_time + overhead_time) / htotal_time
> > -      * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
> > -      */
> > -     pixel_clock = dsi->vm.pixelclock;
> > -     htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
> > -                     dsi->vm.hsync_len;
> > -     htotal_bits = htotal * bit_per_pixel;
> > -
> > -     overhead_cycles = T_LPX + T_HS_PREP + T_HS_ZERO + T_HS_TRAIL +
> > -                     T_HS_EXIT;
> > -     overhead_bits = overhead_cycles * dsi->lanes * 8;
> > -     total_bits = htotal_bits + overhead_bits;
> > -
> > -     dsi->data_rate = DIV_ROUND_UP_ULL(pixel_clock * total_bits,
> > -                                       htotal * dsi->lanes);
> > +     dsi->data_rate = DIV_ROUND_UP_ULL(dsi->vm.pixelclock * bit_per_pixel, dsi->lanes);

nit: Wrap this line, it's over 80 characters.

> >
> >       ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);
> >       if (ret < 0) {
>
>

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