[PATCH] mediatek: dsi: Add dsi per-frame lp code for mt8188

[Shuijing Li]

Adding the per-frame lp function of mt8188, which can keep HFP in HS and
reduce the time required for each line to enter and exit low power.
Per Frame LP:
  |<----------One Active Frame-------->|
--______________________________________----___________________
  ^HSA+HBP^^RGB^^HFP^^HSA+HBP^^RGB^^HFP^    ^HSA+HBP^^RGB^^HFP^

Per Line LP:
  |<---------------One Active Frame----------->|
--______________--______________--______________----______________
  ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^    ^HSA+HBP^^RGB^

Signed-off-by: Shuijing Li <shuijing.li at mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 100 +++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index a2fdfc8ddb15..e6f4807c8711 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -83,6 +83,7 @@
 #define DSI_HSA_WC		0x50
 #define DSI_HBP_WC		0x54
 #define DSI_HFP_WC		0x58
+#define DSI_BLLP_WC		0x5C
 
 #define DSI_CMDQ_SIZE		0x60
 #define CMDQ_SIZE			0x3f
@@ -180,6 +181,7 @@ struct mtk_dsi_driver_data {
 	bool has_shadow_ctl;
 	bool has_size_ctl;
 	bool cmdq_long_packet_ctl;
+	bool support_per_frame_lp;
 };
 
 struct mtk_dsi {
@@ -516,6 +518,103 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
 			(vm->hactive * dsi_tmp_buf_bpp + 2) % dsi->lanes;
 	}
 
+	if (dsi->driver_data->support_per_frame_lp) {
+		unsigned int lpx = 0, da_hs_exit = 0, da_hs_prep = 0, da_hs_trail = 0;
+		unsigned int da_hs_zero = 0, ps_wc = 0, hs_vb_ps_wc = 0;
+		u32 bllp_wc, bllp_en, v_active_roundup, hstx_cklp_wc;
+		u32 hstx_cklp_wc_max, hstx_cklp_wc_min;
+
+		da_hs_trail = (readl(dsi->regs + DSI_PHY_TIMECON0) >> 24) & 0xff;
+		bllp_en = (readl(dsi->regs + DSI_TXRX_CTRL) >> 7) & 0x1;
+		if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
+			horizontal_sync_active_byte =
+				(vm->hsync_len * dsi_tmp_buf_bpp - 10);
+			horizontal_backporch_byte =
+				(vm->hback_porch * dsi_tmp_buf_bpp - 10);
+			horizontal_frontporch_byte =
+				(vm->hfront_porch * dsi_tmp_buf_bpp - 12);
+
+			ps_wc = readl(dsi->regs + DSI_PSCTRL) & 0x7fff;
+			v_active_roundup = (32 + horizontal_sync_active_byte +
+				horizontal_backporch_byte + ps_wc +
+				horizontal_frontporch_byte) % dsi->lanes;
+			if (v_active_roundup)
+				horizontal_backporch_byte = horizontal_backporch_byte +
+					dsi->lanes - v_active_roundup;
+			hstx_cklp_wc_min = (DIV_ROUND_UP((12 + 2 + 4 +
+				horizontal_sync_active_byte), dsi->lanes) + da_hs_trail + 1)
+				* dsi->lanes / 6 - 1;
+			hstx_cklp_wc_max = (DIV_ROUND_UP((20 + 6 + 4 +
+				horizontal_sync_active_byte + horizontal_backporch_byte +
+				ps_wc), dsi->lanes) + da_hs_trail + 1) * dsi->lanes / 6 - 1;
+		} else {
+			horizontal_sync_active_byte = vm->hsync_len * dsi_tmp_buf_bpp - 4;
+
+			horizontal_backporch_byte = (vm->hback_porch + vm->hsync_len) *
+				dsi_tmp_buf_bpp - 10;
+			hstx_cklp_wc_min = (DIV_ROUND_UP(4, dsi->lanes) + da_hs_trail + 1)
+				* dsi->lanes / 6 - 1;
+
+			if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
+				ps_wc = readl(dsi->regs + DSI_PSCTRL) & 0x7fff;
+				bllp_wc = readl(dsi->regs + DSI_BLLP_WC) & 0xfff;
+				horizontal_frontporch_byte = (vm->hfront_porch *
+					dsi_tmp_buf_bpp - 18);
+
+				v_active_roundup = (28 + horizontal_backporch_byte + ps_wc +
+					horizontal_frontporch_byte + bllp_wc) % dsi->lanes;
+				if (v_active_roundup)
+					horizontal_backporch_byte = horizontal_backporch_byte +
+					dsi->lanes - v_active_roundup;
+				if (bllp_en) {
+					hstx_cklp_wc_max = (DIV_ROUND_UP((16 + 6 + 4 +
+						horizontal_backporch_byte + bllp_wc + ps_wc),
+						dsi->lanes) + da_hs_trail + 1) * dsi->lanes / 6 - 1;
+				} else {
+					hstx_cklp_wc_max = (DIV_ROUND_UP((12 + 4 + 4 +
+						horizontal_backporch_byte + bllp_wc + ps_wc),
+						dsi->lanes) + da_hs_trail + 1) * dsi->lanes / 6 - 1;
+				}
+			} else {
+				ps_wc = readl(dsi->regs + DSI_PSCTRL) & 0x7fff;
+				horizontal_frontporch_byte = (vm->hfront_porch *
+					dsi_tmp_buf_bpp - 12);
+
+				v_active_roundup = (22 + horizontal_backporch_byte + ps_wc +
+					horizontal_frontporch_byte) % dsi->lanes;
+				if (v_active_roundup)
+					horizontal_backporch_byte = horizontal_backporch_byte +
+					dsi->lanes - v_active_roundup;
+
+				hstx_cklp_wc_max = (DIV_ROUND_UP((12 + 4 + 4 +
+					horizontal_backporch_byte + ps_wc),
+					dsi->lanes) + da_hs_trail + 1) * dsi->lanes / 6 - 1;
+			}
+		}
+		hstx_cklp_wc = (readl(dsi->regs + DSI_HSTX_CKL_WC) >> 2) & 0x3fff;
+		if (hstx_cklp_wc <= hstx_cklp_wc_min ||
+			hstx_cklp_wc >= hstx_cklp_wc_max) {
+			hstx_cklp_wc = (hstx_cklp_wc_max / 2) << 2;
+			writel(hstx_cklp_wc, dsi->regs + DSI_HSTX_CKL_WC);
+		}
+		hstx_cklp_wc = hstx_cklp_wc >> 2;
+		if (hstx_cklp_wc <= hstx_cklp_wc_min ||
+			hstx_cklp_wc >= hstx_cklp_wc_max) {
+			DRM_WARN("Wrong setting of hstx_ckl_wc\n");
+		}
+
+		lpx = readl(dsi->regs + DSI_PHY_TIMECON0) & 0xff;
+		da_hs_exit = (readl(dsi->regs + DSI_PHY_TIMECON1) >> 24) & 0xff;
+		da_hs_prep = (readl(dsi->regs + DSI_PHY_TIMECON0) >> 8) & 0xff;
+		da_hs_zero = (readl(dsi->regs + DSI_PHY_TIMECON0) >> 16) & 0xff;
+		ps_wc = readl(dsi->regs + DSI_PSCTRL) & 0x7fff;
+		hs_vb_ps_wc = ps_wc -
+			(lpx + da_hs_exit + da_hs_prep + da_hs_zero + 2)
+			* dsi->lanes;
+		horizontal_frontporch_byte = (1 << 31)
+			| (hs_vb_ps_wc << 16)
+			| (horizontal_frontporch_byte);
+	}
 	writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
 	writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
 	writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
@@ -1246,6 +1345,7 @@ static const struct mtk_dsi_driver_data mt8188_dsi_driver_data = {
 	.has_shadow_ctl = true,
 	.has_size_ctl = true,
 	.cmdq_long_packet_ctl = true,
+	.support_per_frame_lp = true,
 };
 
 static const struct of_device_id mtk_dsi_of_match[] = {
-- 
2.43.0