From 31e607ee973490d375953eaabf4d3a13de0c32cd Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Wed, 28 Jul 2010 15:53:38 +0300
Subject: [PATCH] --- yaml --- r: 251034 b: refs/heads/master c:
 40885ab31f754426c2e9a40362e568778baa5e82 h: refs/heads/master v: v3

---
 [refs]                              |   2 +-
 trunk/drivers/video/omap2/dss/dsi.c | 141 ++++++++++++++++++++++++----
 2 files changed, 124 insertions(+), 19 deletions(-)

diff --git a/[refs] b/[refs]
index 7ef9912cbf63..1863788120c2 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 95861368e3eb2180dc9f00e916a4ba6f5e1fe4ce
+refs/heads/master: 40885ab31f754426c2e9a40362e568778baa5e82
diff --git a/trunk/drivers/video/omap2/dss/dsi.c b/trunk/drivers/video/omap2/dss/dsi.c
index 4223164f6507..e2ae1e7372f2 100644
--- a/trunk/drivers/video/omap2/dss/dsi.c
+++ b/trunk/drivers/video/omap2/dss/dsi.c
@@ -33,6 +33,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
+#include <linux/sched.h>
 
 #include <video/omapdss.h>
 #include <plat/clock.h>
@@ -268,6 +269,7 @@ static struct
 	struct dsi_update_region update_region;
 
 	bool te_enabled;
+	bool ulps_enabled;
 
 	struct workqueue_struct *workqueue;
 
@@ -1925,9 +1927,13 @@ static void dsi_disable_lane_override(void)
 static int dsi_complexio_init(struct omap_dss_device *dssdev)
 {
 	int r = 0;
+	u32 l;
 
 	DSSDBG("dsi_complexio_init\n");
 
+	if (dsi.ulps_enabled)
+		DSSDBG("manual ulps exit\n");
+
 	/* A dummy read using the SCP interface to any DSIPHY register is
 	 * required after DSIPHY reset to complete the reset of the DSI complex
 	 * I/O. */
@@ -1941,11 +1947,49 @@ static int dsi_complexio_init(struct omap_dss_device *dssdev)
 
 	dsi_complexio_config(dssdev);
 
-	r = dsi_complexio_power(DSI_COMPLEXIO_POWER_ON);
+	dsi_if_enable(true);
+	dsi_if_enable(false);
+	REG_FLD_MOD(DSI_CLK_CTRL, 1, 20, 20); /* LP_CLK_ENABLE */
+
+	/* set TX STOP MODE timer to maximum for this operation */
+	l = dsi_read_reg(DSI_TIMING1);
+	l = FLD_MOD(l, 1, 15, 15);	/* FORCE_TX_STOP_MODE_IO */
+	l = FLD_MOD(l, 1, 14, 14);	/* STOP_STATE_X16_IO */
+	l = FLD_MOD(l, 1, 13, 13);	/* STOP_STATE_X4_IO */
+	l = FLD_MOD(l, 0x1fff, 12, 0);	/* STOP_STATE_COUNTER_IO */
+	dsi_write_reg(DSI_TIMING1, l);
+
+	if (dsi.ulps_enabled) {
+		/* ULPS is exited by Mark-1 state for 1ms, followed by
+		 * stop state. DSS HW cannot do this via the normal
+		 * ULPS exit sequence, as after reset the DSS HW thinks
+		 * that we are not in ULPS mode, and refuses to send the
+		 * sequence. So we need to send the ULPS exit sequence
+		 * manually.
+		 */
+
+		dsi_enable_lane_override(dssdev,
+				DSI_CLK_P | DSI_DATA1_P | DSI_DATA2_P);
+	}
 
+	r = dsi_complexio_power(DSI_COMPLEXIO_POWER_ON);
 	if (r)
 		goto err;
 
+	if (dsi.ulps_enabled) {
+		/* Keep Mark-1 state for 1ms (as per DSI spec) */
+		ktime_t wait = ns_to_ktime(1000 * 1000);
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		schedule_hrtimeout(&wait, HRTIMER_MODE_REL);
+
+		/* Disable the override. The lanes should be set to Mark-11
+		 * state by the HW */
+		dsi_disable_lane_override();
+	}
+
+	/* FORCE_TX_STOP_MODE_IO */
+	REG_FLD_MOD(DSI_TIMING1, 0, 15, 15);
+
 	if (wait_for_bit_change(DSI_COMPLEXIO_CFG1, 29, 1) != 1) {
 		DSSERR("ComplexIO not coming out of reset.\n");
 		r = -ENODEV;
@@ -1954,23 +1998,7 @@ static int dsi_complexio_init(struct omap_dss_device *dssdev)
 
 	dsi_complexio_timings();
 
-	/*
-	   The configuration of the DSI complex I/O (number of data lanes,
-	   position, differential order) should not be changed while
-	   DSS.DSI_CLK_CRTRL[20] LP_CLK_ENABLE bit is set to 1. For the
-	   hardware to recognize a new configuration of the complex I/O (done
-	   in DSS.DSI_COMPLEXIO_CFG1 register), it is recommended to follow
-	   this sequence: First set the DSS.DSI_CTRL[0] IF_EN bit to 1, next
-	   reset the DSS.DSI_CTRL[0] IF_EN to 0, then set DSS.DSI_CLK_CTRL[20]
-	   LP_CLK_ENABLE to 1, and finally, set again the DSS.DSI_CTRL[0] IF_EN
-	   bit to 1. If the sequence is not followed, the DSi complex I/O
-	   configuration is undetermined.
-	   */
-	dsi_if_enable(1);
-	dsi_if_enable(0);
-	REG_FLD_MOD(DSI_CLK_CTRL, 1, 20, 20); /* LP_CLK_ENABLE */
-	dsi_if_enable(1);
-	dsi_if_enable(0);
+	dsi.ulps_enabled = false;
 
 	DSSDBG("CIO init done\n");
 err:
@@ -2793,6 +2821,80 @@ int dsi_vc_set_max_rx_packet_size(int channel, u16 len)
 }
 EXPORT_SYMBOL(dsi_vc_set_max_rx_packet_size);
 
+static int dsi_enter_ulps(void)
+{
+	DECLARE_COMPLETION_ONSTACK(completion);
+	int r;
+
+	DSSDBGF();
+
+	WARN_ON(!dsi_bus_is_locked());
+
+	WARN_ON(dsi.ulps_enabled);
+
+	if (dsi.ulps_enabled)
+		return 0;
+
+	if (REG_GET(DSI_CLK_CTRL, 13, 13)) {
+		DSSERR("DDR_CLK_ALWAYS_ON enabled when entering ULPS\n");
+		return -EIO;
+	}
+
+	dsi_sync_vc(0);
+	dsi_sync_vc(1);
+	dsi_sync_vc(2);
+	dsi_sync_vc(3);
+
+	dsi_force_tx_stop_mode_io();
+
+	dsi_vc_enable(0, false);
+	dsi_vc_enable(1, false);
+	dsi_vc_enable(2, false);
+	dsi_vc_enable(3, false);
+
+	if (REG_GET(DSI_COMPLEXIO_CFG2, 16, 16)) {	/* HS_BUSY */
+		DSSERR("HS busy when enabling ULPS\n");
+		return -EIO;
+	}
+
+	if (REG_GET(DSI_COMPLEXIO_CFG2, 17, 17)) {	/* LP_BUSY */
+		DSSERR("LP busy when enabling ULPS\n");
+		return -EIO;
+	}
+
+	r = dsi_register_isr_cio(dsi_completion_handler, &completion,
+			DSI_CIO_IRQ_ULPSACTIVENOT_ALL0);
+	if (r)
+		return r;
+
+	/* Assert TxRequestEsc for data lanes and TxUlpsClk for clk lane */
+	/* LANEx_ULPS_SIG2 */
+	REG_FLD_MOD(DSI_COMPLEXIO_CFG2, (1 << 0) | (1 << 1) | (1 << 2), 7, 5);
+
+	if (wait_for_completion_timeout(&completion,
+				msecs_to_jiffies(1000)) == 0) {
+		DSSERR("ULPS enable timeout\n");
+		r = -EIO;
+		goto err;
+	}
+
+	dsi_unregister_isr_cio(dsi_completion_handler, &completion,
+			DSI_CIO_IRQ_ULPSACTIVENOT_ALL0);
+
+	dsi_complexio_power(DSI_COMPLEXIO_POWER_ULPS);
+
+	dsi_if_enable(false);
+
+	dsi.ulps_enabled = true;
+
+	return 0;
+
+err:
+	dsi_unregister_isr_cio(dsi_completion_handler, &completion,
+			DSI_CIO_IRQ_ULPSACTIVENOT_ALL0);
+	return r;
+}
+
 static void dsi_set_lp_rx_timeout(unsigned ticks, bool x4, bool x16)
 {
 	unsigned long fck;
@@ -3547,6 +3649,9 @@ static int dsi_display_init_dsi(struct omap_dss_device *dssdev)
 
 static void dsi_display_uninit_dsi(struct omap_dss_device *dssdev)
 {
+	if (!dsi.ulps_enabled)
+		dsi_enter_ulps();
+
 	/* disable interface */
 	dsi_if_enable(0);
 	dsi_vc_enable(0, 0);