[PATCH 4/4] drm/msm/dsi: Populate the 10nm PHY funcs

[Archit Taneja <architt@codeaurora.org>]

Populate the PHY ops with the downstream driver as reference.

There are a couple of TODOs which need to be resolved:
- The PHY timings are all hardcoded for now. This needs to be replaced
  with automatic calculations once we get/understand them.
- There are some lane configuration registers which use a new
  representation between physical and logical lane mappings. For now,
  we've hardcoced them to follow the default mapping (i.e
  logical 0 -> phy 0, logical 1 -> phy 1 etc).

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c | 199 +++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
index b7545fb63bf5..0af951aaeea1 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
@@ -8,9 +8,208 @@
 #include "dsi_phy.h"
 #include "dsi.xml.h"
 
+static int dsi_phy_hw_v3_0_is_pll_on(struct msm_dsi_phy *phy)
+{
+	void __iomem *base = phy->base;
+	u32 data = 0;
+
+	data = dsi_phy_read(base + REG_DSI_10nm_PHY_CMN_PLL_CNTRL);
+	mb(); /* make sure read happened */
+
+	return (data & BIT(0));
+}
+
+static void dsi_phy_hw_v3_0_config_lpcdrx(struct msm_dsi_phy *phy, bool enable)
+{
+	void __iomem *lane_base = phy->lane_base;
+	int phy_lane_0 = 0;	/* TODO: Support all lane swap configs */
+
+	/*
+	 * LPRX and CDRX need to enabled only for physical data lane
+	 * corresponding to the logical data lane 0
+	 */
+	if (enable)
+		dsi_phy_write(lane_base +
+			      REG_DSI_10nm_PHY_LN_LPRX_CTRL(phy_lane_0), 0x3);
+	else
+		dsi_phy_write(lane_base +
+			      REG_DSI_10nm_PHY_LN_LPRX_CTRL(phy_lane_0), 0);
+}
+
+static void dsi_phy_hw_v3_0_lane_settings(struct msm_dsi_phy *phy)
+{
+	int i;
+	u8 tx_dctrl[] = { 0x00, 0x00, 0x00, 0x04, 0x01 };
+	void __iomem *lane_base = phy->lane_base;
+
+	/* Strength ctrl settings */
+	for (i = 0; i < 5; i++) {
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_LPTX_STR_CTRL(i),
+			      0x55);
+		/*
+		 * Disable LPRX and CDRX for all lanes. And later on, it will
+		 * be only enabled for the physical data lane corresponding
+		 * to the logical data lane 0
+		 */
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_LPRX_CTRL(i), 0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_PIN_SWAP(i), 0x0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_HSTX_STR_CTRL(i),
+			      0x88);
+	}
+
+	dsi_phy_hw_v3_0_config_lpcdrx(phy, true);
+
+	/* other settings */
+	for (i = 0; i < 5; i++) {
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_CFG0(i), 0x0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_CFG1(i), 0x0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_CFG2(i), 0x0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_CFG3(i),
+			      i == 4 ? 0x80 : 0x0);
+		dsi_phy_write(lane_base +
+			      REG_DSI_10nm_PHY_LN_OFFSET_TOP_CTRL(i), 0x0);
+		dsi_phy_write(lane_base +
+			      REG_DSI_10nm_PHY_LN_OFFSET_BOT_CTRL(i), 0x0);
+		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_TX_DCTRL(i),
+			      tx_dctrl[i]);
+	}
+
+	/* Toggle BIT 0 to release freeze I/0 */
+	dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_TX_DCTRL(3), 0x05);
+	dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_TX_DCTRL(3), 0x04);
+}
+
+static int msm_dsi_dphy_timing_calc_v3(struct msm_dsi_dphy_timing *timing,
+				       struct msm_dsi_phy_clk_request *clk_req)
+{
+	/*
+	 * TODO: These params need to be computed, they're currently hardcoded
+	 * for a 1440x2560@60Hz panel with a byteclk of 100.618 Mhz, and a
+	 * default escape clock of 19.2 Mhz.
+	 */
+
+	timing->hs_halfbyte_en = 0;
+	timing->clk_zero = 0x1c;
+	timing->clk_prepare = 0x07;
+	timing->clk_trail = 0x07;
+	timing->hs_exit = 0x23;
+	timing->hs_zero = 0x21;
+	timing->hs_prepare = 0x07;
+	timing->hs_trail = 0x07;
+	timing->hs_rqst = 0x05;
+	timing->ta_sure = 0x00;
+	timing->ta_go = 0x03;
+	timing->ta_get = 0x04;
+
+	timing->shared_timings.clk_pre = 0x2d;
+	timing->shared_timings.clk_post = 0x0d;
+
+	return 0;
+}
+
 static int dsi_10nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 			       struct msm_dsi_phy_clk_request *clk_req)
 {
+	int ret;
+	u32 status;
+	u32 const delay_us = 5;
+	u32 const timeout_us = 1000;
+	struct msm_dsi_dphy_timing *timing = &phy->timing;
+	void __iomem *base = phy->base;
+	u32 data;
+
+	DBG("");
+
+	if (msm_dsi_dphy_timing_calc_v3(timing, clk_req)) {
+		dev_err(&phy->pdev->dev,
+			"%s: D-PHY timing calculation failed\n", __func__);
+		return -EINVAL;
+	}
+
+	if (dsi_phy_hw_v3_0_is_pll_on(phy))
+		pr_warn("PLL turned on before configuring PHY\n");
+
+	/* wait for REFGEN READY */
+	ret = readl_poll_timeout_atomic(base + REG_DSI_10nm_PHY_CMN_PHY_STATUS,
+					status, (status & BIT(0)),
+					delay_us, timeout_us);
+	if (ret) {
+		pr_err("Ref gen not ready. Aborting\n");
+		return -EINVAL;
+	}
+
+	/* de-assert digital and pll power down */
+	data = BIT(6) | BIT(5);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_0, data);
+
+	/* Assert PLL core reset */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_PLL_CNTRL, 0x00);
+
+	/* turn off resync FIFO */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_RBUF_CTRL, 0x00);
+
+	/* Select MS1 byte-clk */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_GLBL_CTRL, 0x10);
+
+	/* Enable LDO */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_VREG_CTRL, 0x59);
+
+	/* Configure PHY lane swap (TODO: we need to calculate this) */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_LANE_CFG0, 0x21);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_LANE_CFG1, 0x84);
+
+	/* DSI PHY timings */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_0,
+		      timing->hs_halfbyte_en);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_1,
+		      timing->clk_zero);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_2,
+		      timing->clk_prepare);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_3,
+		      timing->clk_trail);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_4,
+		      timing->hs_exit);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_5,
+		      timing->hs_zero);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_6,
+		      timing->hs_prepare);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_7,
+		      timing->hs_trail);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_8,
+		      timing->hs_rqst);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_9,
+		      timing->ta_go | (timing->ta_sure << 3));
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_10,
+		      timing->ta_get);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_TIMING_CTRL_11,
+		      0x00);
+
+	/* Remove power down from all blocks */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_0, 0x7f);
+
+	/* power up lanes */
+	data = dsi_phy_read(base + REG_DSI_10nm_PHY_CMN_CTRL_0);
+
+	/* TODO: only power up lanes that are used */
+	data |= 0x1F;
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_0, data);
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_LANE_CTRL0, 0x1F);
+
+	/* Select full-rate mode */
+	dsi_phy_write(base + REG_DSI_10nm_PHY_CMN_CTRL_2, 0x40);
+
+	ret = msm_dsi_pll_set_usecase(phy->pll, phy->usecase);
+	if (ret) {
+		dev_err(&phy->pdev->dev, "%s: set pll usecase failed, %d\n",
+			__func__, ret);
+		return ret;
+	}
+
+	/* DSI lane settings */
+	dsi_phy_hw_v3_0_lane_settings(phy);
+
+	DBG("DSI%d PHY enabled", phy->id);
+
 	return 0;
 }
 
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