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Commit 0707632b authored by yt.shen@mediatek.com's avatar yt.shen@mediatek.com Committed by CK Hu
Browse files

drm/mediatek: update DSI sub driver flow for sending commands to panel 



This patch update enable/disable flow of DSI module.
Original flow works on there is a bridge chip: DSI -> bridge -> panel.
In this case: DSI -> panel, the DSI sub driver flow should be updated.
We need to initialize DSI first so that we can send commands to panel.

Signed-off-by: default avatarshaoming chen <shaoming.chen@mediatek.com>
Signed-off-by: default avatarYT Shen <yt.shen@mediatek.com>
Acked-by: default avatarCK Hu <ck.hu@mediatek.com>
parent 2d52bfba

drivers/gpu/drm/mediatek/mtk_dsi.c

+158 −101
Original line number Diff line number Diff line
@@ -126,6 +126,10 @@ 
#define CLK_HS_POST			(0xff << 8)

#define CLK_HS_EXIT			(0xff << 16)



#define DSI_VM_CMD_CON		0x130

#define VM_CMD_EN			BIT(0)

#define TS_VFP_EN			BIT(5)



#define DSI_CMDQ0		0x180

#define CONFIG				(0xff << 0)

#define SHORT_PACKET			0
@@ -239,85 +243,6 @@ static void mtk_dsi_reset_engine(struct mtk_dsi *dsi) 
	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);

}



static int mtk_dsi_poweron(struct mtk_dsi *dsi)

{

	struct device *dev = dsi->dev;

	int ret;

	u64 pixel_clock, total_bits;

	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;



	if (++dsi->refcount != 1)

		return 0;



	switch (dsi->format) {

	case MIPI_DSI_FMT_RGB565:

		bit_per_pixel = 16;

		break;

	case MIPI_DSI_FMT_RGB666_PACKED:

		bit_per_pixel = 18;

		break;

	case MIPI_DSI_FMT_RGB666:

	case MIPI_DSI_FMT_RGB888:

	default:

		bit_per_pixel = 24;

		break;

	}



	/**

	 * vm.pixelclock is in kHz, pixel_clock unit is Hz, so multiply by 1000

	 * 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 * 1000;

	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);



	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);

	if (ret < 0) {

		dev_err(dev, "Failed to set data rate: %d\n", ret);

		goto err_refcount;

	}



	phy_power_on(dsi->phy);



	ret = clk_prepare_enable(dsi->engine_clk);

	if (ret < 0) {

		dev_err(dev, "Failed to enable engine clock: %d\n", ret);

		goto err_phy_power_off;

	}



	ret = clk_prepare_enable(dsi->digital_clk);

	if (ret < 0) {

		dev_err(dev, "Failed to enable digital clock: %d\n", ret);

		goto err_disable_engine_clk;

	}



	mtk_dsi_enable(dsi);

	mtk_dsi_reset_engine(dsi);

	mtk_dsi_phy_timconfig(dsi);



	return 0;



err_disable_engine_clk:

	clk_disable_unprepare(dsi->engine_clk);

err_phy_power_off:

	phy_power_off(dsi->phy);

err_refcount:

	dsi->refcount--;

	return ret;

}



static void mtk_dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)

{

	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
@@ -365,16 +290,23 @@ static void mtk_dsi_set_mode(struct mtk_dsi *dsi) 
	u32 vid_mode = CMD_MODE;



	if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {

		vid_mode = SYNC_PULSE_MODE;



		if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&

		    !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))

		if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)

			vid_mode = BURST_MODE;

		else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)

			vid_mode = SYNC_PULSE_MODE;

		else

			vid_mode = SYNC_EVENT_MODE;

	}



	writel(vid_mode, dsi->regs + DSI_MODE_CTRL);

}



static void mtk_dsi_set_vm_cmd(struct mtk_dsi *dsi)

{

	mtk_dsi_mask(dsi, DSI_VM_CMD_CON, VM_CMD_EN, VM_CMD_EN);

	mtk_dsi_mask(dsi, DSI_VM_CMD_CON, TS_VFP_EN, TS_VFP_EN);

}



static void mtk_dsi_ps_control_vact(struct mtk_dsi *dsi)

{

	struct videomode *vm = &dsi->vm;
@@ -512,6 +444,16 @@ static void mtk_dsi_start(struct mtk_dsi *dsi) 
	writel(1, dsi->regs + DSI_START);

}



static void mtk_dsi_stop(struct mtk_dsi *dsi)

{

	writel(0, dsi->regs + DSI_START);

}



static void mtk_dsi_set_cmd_mode(struct mtk_dsi *dsi)

{

	writel(CMD_MODE, dsi->regs + DSI_MODE_CTRL);

}



static void mtk_dsi_set_interrupt_enable(struct mtk_dsi *dsi)

{

	u32 inten = LPRX_RD_RDY_INT_FLAG | CMD_DONE_INT_FLAG | VM_DONE_INT_FLAG;
@@ -570,6 +512,116 @@ static irqreturn_t mtk_dsi_irq(int irq, void *dev_id) 
	return IRQ_HANDLED;

}



static s32 mtk_dsi_switch_to_cmd_mode(struct mtk_dsi *dsi, u8 irq_flag, u32 t)

{

	mtk_dsi_irq_data_clear(dsi, irq_flag);

	mtk_dsi_set_cmd_mode(dsi);



	if (!mtk_dsi_wait_for_irq_done(dsi, irq_flag, t)) {

		DRM_ERROR("failed to switch cmd mode\n");

		return -ETIME;

	} else {

		return 0;

	}

}



static int mtk_dsi_poweron(struct mtk_dsi *dsi)

{

	struct device *dev = dsi->dev;

	int ret;

	u64 pixel_clock, total_bits;

	u32 htotal, htotal_bits, bit_per_pixel, overhead_cycles, overhead_bits;



	if (++dsi->refcount != 1)

		return 0;



	switch (dsi->format) {

	case MIPI_DSI_FMT_RGB565:

		bit_per_pixel = 16;

		break;

	case MIPI_DSI_FMT_RGB666_PACKED:

		bit_per_pixel = 18;

		break;

	case MIPI_DSI_FMT_RGB666:

	case MIPI_DSI_FMT_RGB888:

	default:

		bit_per_pixel = 24;

		break;

	}



	/**

	 * vm.pixelclock is in kHz, pixel_clock unit is Hz, so multiply by 1000

	 * 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 * 1000;

	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);



	ret = clk_set_rate(dsi->hs_clk, dsi->data_rate);

	if (ret < 0) {

		dev_err(dev, "Failed to set data rate: %d\n", ret);

		goto err_refcount;

	}



	phy_power_on(dsi->phy);



	ret = clk_prepare_enable(dsi->engine_clk);

	if (ret < 0) {

		dev_err(dev, "Failed to enable engine clock: %d\n", ret);

		goto err_phy_power_off;

	}



	ret = clk_prepare_enable(dsi->digital_clk);

	if (ret < 0) {

		dev_err(dev, "Failed to enable digital clock: %d\n", ret);

		goto err_disable_engine_clk;

	}



	mtk_dsi_enable(dsi);

	mtk_dsi_reset_engine(dsi);

	mtk_dsi_phy_timconfig(dsi);



	mtk_dsi_rxtx_control(dsi);

	mtk_dsi_ps_control_vact(dsi);

	mtk_dsi_set_vm_cmd(dsi);

	mtk_dsi_config_vdo_timing(dsi);

	mtk_dsi_set_interrupt_enable(dsi);



	mtk_dsi_clk_ulp_mode_leave(dsi);

	mtk_dsi_lane0_ulp_mode_leave(dsi);

	mtk_dsi_clk_hs_mode(dsi, 0);



	if (dsi->panel) {

		if (drm_panel_prepare(dsi->panel)) {

			DRM_ERROR("failed to prepare the panel\n");

			goto err_disable_digital_clk;

		}

	}



	return 0;

err_disable_digital_clk:

	clk_disable_unprepare(dsi->digital_clk);

err_disable_engine_clk:

	clk_disable_unprepare(dsi->engine_clk);

err_phy_power_off:

	phy_power_off(dsi->phy);

err_refcount:

	dsi->refcount--;

	return ret;

}



static void mtk_dsi_poweroff(struct mtk_dsi *dsi)

{

	if (WARN_ON(dsi->refcount == 0))
@@ -578,6 +630,16 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi) 
	if (--dsi->refcount != 0)

		return;



	if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) {

		if (dsi->panel) {

			if (drm_panel_unprepare(dsi->panel)) {

				DRM_ERROR("failed to unprepare the panel\n");

				return;

			}

		}

	}



	mtk_dsi_reset_engine(dsi);

	mtk_dsi_lane0_ulp_mode_enter(dsi);

	mtk_dsi_clk_ulp_mode_enter(dsi);
@@ -596,36 +658,30 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi) 
	if (dsi->enabled)

		return;



	if (dsi->panel) {

		if (drm_panel_prepare(dsi->panel)) {

			DRM_ERROR("failed to setup the panel\n");

			return;

		}

	}



	ret = mtk_dsi_poweron(dsi);

	if (ret < 0) {

		DRM_ERROR("failed to power on dsi\n");

		return;

	}



	mtk_dsi_rxtx_control(dsi);



	mtk_dsi_clk_ulp_mode_leave(dsi);

	mtk_dsi_lane0_ulp_mode_leave(dsi);

	mtk_dsi_clk_hs_mode(dsi, 0);

	mtk_dsi_set_mode(dsi);



	mtk_dsi_ps_control_vact(dsi);

	mtk_dsi_config_vdo_timing(dsi);

	mtk_dsi_set_interrupt_enable(dsi);



	mtk_dsi_set_mode(dsi);

	mtk_dsi_clk_hs_mode(dsi, 1);



	mtk_dsi_start(dsi);



	if (dsi->panel) {

		if (drm_panel_enable(dsi->panel)) {

			DRM_ERROR("failed to enable the panel\n");

			goto err_dsi_power_off;

		}

	}



	dsi->enabled = true;



	return;

err_dsi_power_off:

	mtk_dsi_stop(dsi);

	mtk_dsi_poweroff(dsi);

}



static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
@@ -640,6 +696,7 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi) 
		}

	}



	mtk_dsi_stop(dsi);

	mtk_dsi_poweroff(dsi);



	dsi->enabled = false;