drm/msm/dsi: Return more timings from PHY to host

The DSI host is required to configure more timings calculated
in PHY. By introducing a shared structure, this change allows
more timing information passed from PHY to host.

Signed-off-by: Hai Li <hali@codeaurora.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

Author: Hai Li

drivers/gpu/drm/msm/dsi/dsi.h

@@ -27,6 +27,8 @@
 #define DSI_1	1
 #define DSI_MAX	2
 
+struct msm_dsi_phy_shared_timings;
+
 enum msm_dsi_phy_type {
 	MSM_DSI_PHY_28NM_HPM,
 	MSM_DSI_PHY_28NM_LP,
@@ -86,7 +88,7 @@ struct drm_connector *msm_dsi_manager_connector_init(u8 id);
 struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id);
 int msm_dsi_manager_phy_enable(int id,
 		const unsigned long bit_rate, const unsigned long esc_rate,
-		u32 *clk_pre, u32 *clk_post);
+		struct msm_dsi_phy_shared_timings *shared_timing);
 void msm_dsi_manager_phy_disable(int id);
 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg);
 bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len);
@@ -165,13 +167,18 @@ int msm_dsi_host_init(struct msm_dsi *msm_dsi);
 
 /* dsi phy */
 struct msm_dsi_phy;
+struct msm_dsi_phy_shared_timings {
+	u32 clk_post;
+	u32 clk_pre;
+	bool clk_pre_inc_by_2;
+};
 void msm_dsi_phy_driver_register(void);
 void msm_dsi_phy_driver_unregister(void);
 int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 	const unsigned long bit_rate, const unsigned long esc_rate);
 void msm_dsi_phy_disable(struct msm_dsi_phy *phy);
-void msm_dsi_phy_get_clk_pre_post(struct msm_dsi_phy *phy,
-					u32 *clk_pre, u32 *clk_post);
+void msm_dsi_phy_get_shared_timings(struct msm_dsi_phy *phy,
+			struct msm_dsi_phy_shared_timings *shared_timing);
 struct msm_dsi_pll *msm_dsi_phy_get_pll(struct msm_dsi_phy *phy);
 
 #endif /* __DSI_CONNECTOR_H__ */

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -756,7 +756,7 @@ static inline enum dsi_cmd_dst_format dsi_get_cmd_fmt(
 }
 
 static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
-				u32 clk_pre, u32 clk_post)
+			struct msm_dsi_phy_shared_timings *phy_shared_timings)
 {
 	u32 flags = msm_host->mode_flags;
 	enum mipi_dsi_pixel_format mipi_fmt = msm_host->format;
@@ -819,10 +819,16 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
 		data |= DSI_TRIG_CTRL_BLOCK_DMA_WITHIN_FRAME;
 	dsi_write(msm_host, REG_DSI_TRIG_CTRL, data);
 
-	data = DSI_CLKOUT_TIMING_CTRL_T_CLK_POST(clk_post) |
-		DSI_CLKOUT_TIMING_CTRL_T_CLK_PRE(clk_pre);
+	data = DSI_CLKOUT_TIMING_CTRL_T_CLK_POST(phy_shared_timings->clk_post) |
+		DSI_CLKOUT_TIMING_CTRL_T_CLK_PRE(phy_shared_timings->clk_pre);
 	dsi_write(msm_host, REG_DSI_CLKOUT_TIMING_CTRL, data);
 
+	if ((cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) &&
+	    (cfg_hnd->minor > MSM_DSI_6G_VER_MINOR_V1_0) &&
+	    phy_shared_timings->clk_pre_inc_by_2)
+		dsi_write(msm_host, REG_DSI_T_CLK_PRE_EXTEND,
+			  DSI_T_CLK_PRE_EXTEND_INC_BY_2_BYTECLK);
+
 	data = 0;
 	if (!(flags & MIPI_DSI_MODE_EOT_PACKET))
 		data |= DSI_EOT_PACKET_CTRL_TX_EOT_APPEND;
@@ -2170,7 +2176,7 @@ static void msm_dsi_sfpb_config(struct msm_dsi_host *msm_host, bool enable)
 int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 {
 	struct msm_dsi_host *msm_host = to_msm_dsi_host(host);
-	u32 clk_pre = 0, clk_post = 0;
+	struct msm_dsi_phy_shared_timings phy_shared_timings;
 	int ret = 0;
 
 	mutex_lock(&msm_host->dev_mutex);
@@ -2204,7 +2210,7 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 	ret = msm_dsi_manager_phy_enable(msm_host->id,
 					msm_host->byte_clk_rate * 8,
 					msm_host->esc_clk_rate,
-					&clk_pre, &clk_post);
+					&phy_shared_timings);
 	dsi_bus_clk_disable(msm_host);
 	if (ret) {
 		pr_err("%s: failed to enable phy, %d\n", __func__, ret);
@@ -2226,7 +2232,7 @@ int msm_dsi_host_power_on(struct mipi_dsi_host *host)
 
 	dsi_timing_setup(msm_host);
 	dsi_sw_reset(msm_host);
-	dsi_ctrl_config(msm_host, true, clk_pre, clk_post);
+	dsi_ctrl_config(msm_host, true, &phy_shared_timings);
 
 	if (msm_host->disp_en_gpio)
 		gpiod_set_value(msm_host->disp_en_gpio, 1);
@@ -2255,7 +2261,7 @@ int msm_dsi_host_power_off(struct mipi_dsi_host *host)
 		goto unlock_ret;
 	}
 
-	dsi_ctrl_config(msm_host, false, 0, 0);
+	dsi_ctrl_config(msm_host, false, NULL);
 
 	if (msm_host->disp_en_gpio)
 		gpiod_set_value(msm_host->disp_en_gpio, 0);

drivers/gpu/drm/msm/dsi/dsi_manager.c

@@ -660,7 +660,7 @@ void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
 
 int msm_dsi_manager_phy_enable(int id,
 		const unsigned long bit_rate, const unsigned long esc_rate,
-		u32 *clk_pre, u32 *clk_post)
+		struct msm_dsi_phy_shared_timings *shared_timings)
 {
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct msm_dsi_phy *phy = msm_dsi->phy;
@@ -688,7 +688,7 @@ int msm_dsi_manager_phy_enable(int id,
 	}
 
 	msm_dsi->phy_enabled = true;
-	msm_dsi_phy_get_clk_pre_post(phy, clk_pre, clk_post);
+	msm_dsi_phy_get_shared_timings(phy, shared_timings);
 
 	return 0;
 }

drivers/gpu/drm/msm/dsi/phy/dsi_phy.c

@@ -115,26 +115,30 @@ int msm_dsi_dphy_timing_calc(struct msm_dsi_dphy_timing *timing,
 	temp = ((timing->hs_exit >> 1) + 1) * 2 * ui;
 	temp = 60 * coeff + 52 * ui - 24 * ui - temp;
 	tmin = S_DIV_ROUND_UP(temp, 8 * ui) - 1;
-	timing->clk_post = linear_inter(tmax, tmin, pcnt2, 0, false);
-
+	timing->shared_timings.clk_post = linear_inter(tmax, tmin, pcnt2, 0,
+						       false);
 	tmax = 63;
 	temp = ((timing->clk_prepare >> 1) + 1) * 2 * ui;
 	temp += ((timing->clk_zero >> 1) + 1) * 2 * ui;
 	temp += 8 * ui + lpx;
 	tmin = S_DIV_ROUND_UP(temp, 8 * ui) - 1;
 	if (tmin > tmax) {
 		temp = linear_inter(2 * tmax, tmin, pcnt2, 0, false);
-		timing->clk_pre = temp >> 1;
+		timing->shared_timings.clk_pre = temp >> 1;
+		timing->shared_timings.clk_pre_inc_by_2 = true;
 	} else {
-		timing->clk_pre = linear_inter(tmax, tmin, pcnt2, 0, false);
+		timing->shared_timings.clk_pre =
+				linear_inter(tmax, tmin, pcnt2, 0, false);
+		timing->shared_timings.clk_pre_inc_by_2 = false;
 	}
 
 	timing->ta_go = 3;
 	timing->ta_sure = 0;
 	timing->ta_get = 4;
 
-	DBG("PHY timings: %d, %d, %d, %d, %d, %d, %d, %d, %d, %d",
-		timing->clk_pre, timing->clk_post, timing->clk_zero,
+	DBG("PHY timings: %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d",
+		timing->shared_timings.clk_pre, timing->shared_timings.clk_post,
+		timing->shared_timings.clk_pre_inc_by_2, timing->clk_zero,
 		timing->clk_trail, timing->clk_prepare, timing->hs_exit,
 		timing->hs_zero, timing->hs_prepare, timing->hs_trail,
 		timing->hs_rqst);
@@ -460,16 +464,11 @@ void msm_dsi_phy_disable(struct msm_dsi_phy *phy)
 	dsi_phy_regulator_disable(phy);
 }
 
-void msm_dsi_phy_get_clk_pre_post(struct msm_dsi_phy *phy,
-					u32 *clk_pre, u32 *clk_post)
+void msm_dsi_phy_get_shared_timings(struct msm_dsi_phy *phy,
+			struct msm_dsi_phy_shared_timings *shared_timings)
 {
-	if (!phy)
-		return;
-
-	if (clk_pre)
-		*clk_pre = phy->timing.clk_pre;
-	if (clk_post)
-		*clk_post = phy->timing.clk_post;
+	memcpy(shared_timings, &phy->timing.shared_timings,
+	       sizeof(*shared_timings));
 }
 
 struct msm_dsi_pll *msm_dsi_phy_get_pll(struct msm_dsi_phy *phy)

drivers/gpu/drm/msm/dsi/phy/dsi_phy.h

@@ -62,6 +62,8 @@ struct msm_dsi_dphy_timing {
 	u32 ta_go;
 	u32 ta_sure;
 	u32 ta_get;
+
+	struct msm_dsi_phy_shared_timings shared_timings;
 };
 
 struct msm_dsi_phy {