OMAP: DSS2: enable VDDS_DSI when using DPI

It looks like on OMAP3 some DSS pins need VDDS_DSI to function properly.

This has not been confirmed from TI, but looking at figure 15-1 "Display
subsystem highlight" from the TRM, some data pins come near the DSI and SDI
blocks. This is not very hard evidence, but the fact remains that with the
power on, pixels are ok, and with the power off, pixels are not ok.

It may also be that VDDS_SDI is needed to power some pins, but as normally
both VDDS_SDI and VDDS_DSI come from the same power source, this hasn't
been shown.

It seems that a single driver can only get a regulator once. This patch
solves it by getting all the required regulators in one place, and from
which the submodules then get the regulators they need.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/dss/core.c

@@ -31,6 +31,7 @@
 #include <linux/debugfs.h>
 #include <linux/io.h>
 #include <linux/device.h>
+#include <linux/regulator/consumer.h>
 
 #include <plat/display.h>
 #include <plat/clock.h>
@@ -47,6 +48,10 @@ static struct {
 	struct clk      *dss_54m_fck;
 	struct clk	*dss_96m_fck;
 	unsigned	num_clks_enabled;
+
+	struct regulator *vdds_dsi_reg;
+	struct regulator *vdds_sdi_reg;
+	struct regulator *vdda_dac_reg;
 } core;
 
 static void dss_clk_enable_all_no_ctx(void);
@@ -352,6 +357,50 @@ static void dss_clk_disable_all(void)
 	dss_clk_disable(clks);
 }
 
+/* REGULATORS */
+
+struct regulator *dss_get_vdds_dsi(void)
+{
+	struct regulator *reg;
+
+	if (core.vdds_dsi_reg != NULL)
+		return core.vdds_dsi_reg;
+
+	reg = regulator_get(&core.pdev->dev, "vdds_dsi");
+	if (!IS_ERR(reg))
+		core.vdds_dsi_reg = reg;
+
+	return reg;
+}
+
+struct regulator *dss_get_vdds_sdi(void)
+{
+	struct regulator *reg;
+
+	if (core.vdds_sdi_reg != NULL)
+		return core.vdds_sdi_reg;
+
+	reg = regulator_get(&core.pdev->dev, "vdds_sdi");
+	if (!IS_ERR(reg))
+		core.vdds_sdi_reg = reg;
+
+	return reg;
+}
+
+struct regulator *dss_get_vdda_dac(void)
+{
+	struct regulator *reg;
+
+	if (core.vdda_dac_reg != NULL)
+		return core.vdda_dac_reg;
+
+	reg = regulator_get(&core.pdev->dev, "vdda_dac");
+	if (!IS_ERR(reg))
+		core.vdda_dac_reg = reg;
+
+	return reg;
+}
+
 /* DEBUGFS */
 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
 static void dss_debug_dump_clocks(struct seq_file *s)
@@ -473,7 +522,7 @@ static int omap_dss_probe(struct platform_device *pdev)
 	}
 #endif
 
-	r = dpi_init();
+	r = dpi_init(pdev);
 	if (r) {
 		DSSERR("Failed to initialize dpi\n");
 		goto fail0;
@@ -901,6 +950,21 @@ static int __init omap_dss_init(void)
 
 static void __exit omap_dss_exit(void)
 {
+	if (core.vdds_dsi_reg != NULL) {
+		regulator_put(core.vdds_dsi_reg);
+		core.vdds_dsi_reg = NULL;
+	}
+
+	if (core.vdds_sdi_reg != NULL) {
+		regulator_put(core.vdds_sdi_reg);
+		core.vdds_sdi_reg = NULL;
+	}
+
+	if (core.vdda_dac_reg != NULL) {
+		regulator_put(core.vdda_dac_reg);
+		core.vdda_dac_reg = NULL;
+	}
+
 	platform_driver_unregister(&omap_dss_driver);
 
 	omap_dss_bus_unregister();

drivers/video/omap2/dss/dpi.c

@@ -25,7 +25,10 @@
 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/err.h>
 #include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 
 #include <plat/display.h>
 #include <plat/cpu.h>
@@ -34,6 +37,7 @@
 
 static struct {
 	int update_enabled;
+	struct regulator *vdds_dsi_reg;
 } dpi;
 
 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
@@ -166,21 +170,27 @@ static int dpi_display_enable(struct omap_dss_device *dssdev)
 		goto err1;
 	}
 
+	if (cpu_is_omap34xx()) {
+		r = regulator_enable(dpi.vdds_dsi_reg);
+		if (r)
+			goto err2;
+	}
+
 	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 
 	r = dpi_basic_init(dssdev);
 	if (r)
-		goto err2;
+		goto err3;
 
 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 	dss_clk_enable(DSS_CLK_FCK2);
 	r = dsi_pll_init(dssdev, 0, 1);
 	if (r)
-		goto err3;
+		goto err4;
 #endif
 	r = dpi_set_mode(dssdev);
 	if (r)
-		goto err4;
+		goto err5;
 
 	mdelay(2);
 
@@ -188,22 +198,25 @@ static int dpi_display_enable(struct omap_dss_device *dssdev)
 
 	r = dssdev->driver->enable(dssdev);
 	if (r)
-		goto err5;
+		goto err6;
 
 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 
 	return 0;
 
-err5:
+err6:
 	dispc_enable_lcd_out(0);
-err4:
+err5:
 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 	dsi_pll_uninit();
-err3:
+err4:
 	dss_clk_disable(DSS_CLK_FCK2);
 #endif
-err2:
+err3:
 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
+err2:
+	if (cpu_is_omap34xx())
+		regulator_disable(dpi.vdds_dsi_reg);
 err1:
 	omap_dss_stop_device(dssdev);
 err0:
@@ -232,6 +245,9 @@ static void dpi_display_disable(struct omap_dss_device *dssdev)
 
 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 
+	if (cpu_is_omap34xx())
+		regulator_disable(dpi.vdds_dsi_reg);
+
 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 
 	omap_dss_stop_device(dssdev);
@@ -251,6 +267,9 @@ static int dpi_display_suspend(struct omap_dss_device *dssdev)
 
 	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 
+	if (cpu_is_omap34xx())
+		regulator_disable(dpi.vdds_dsi_reg);
+
 	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 
 	return 0;
@@ -258,11 +277,19 @@ static int dpi_display_suspend(struct omap_dss_device *dssdev)
 
 static int dpi_display_resume(struct omap_dss_device *dssdev)
 {
+	int r;
+
 	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
 		return -EINVAL;
 
 	DSSDBG("dpi_display_resume\n");
 
+	if (cpu_is_omap34xx()) {
+		r = regulator_enable(dpi.vdds_dsi_reg);
+		if (r)
+			goto err0;
+	}
+
 	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 
 	dispc_enable_lcd_out(1);
@@ -273,6 +300,8 @@ static int dpi_display_resume(struct omap_dss_device *dssdev)
 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 
 	return 0;
+err0:
+	return r;
 }
 
 static void dpi_set_timings(struct omap_dss_device *dssdev,
@@ -388,8 +417,16 @@ int dpi_init_display(struct omap_dss_device *dssdev)
 	return 0;
 }
 
-int dpi_init(void)
+int dpi_init(struct platform_device *pdev)
 {
+	if (cpu_is_omap34xx()) {
+		dpi.vdds_dsi_reg = dss_get_vdds_dsi();
+		if (IS_ERR(dpi.vdds_dsi_reg)) {
+			DSSERR("can't get VDDS_DSI regulator\n");
+			return PTR_ERR(dpi.vdds_dsi_reg);
+		}
+	}
+
 	return 0;
 }
 

drivers/video/omap2/dss/dsi.c

@@ -3799,7 +3799,7 @@ int dsi_init(struct platform_device *pdev)
 		goto err1;
 	}
 
-	dsi.vdds_dsi_reg = regulator_get(&pdev->dev, "vdds_dsi");
+	dsi.vdds_dsi_reg = dss_get_vdds_dsi();
 	if (IS_ERR(dsi.vdds_dsi_reg)) {
 		iounmap(dsi.base);
 		DSSERR("can't get VDDS_DSI regulator\n");
@@ -3830,8 +3830,6 @@ void dsi_exit(void)
 {
 	kthread_stop(dsi.thread);
 
-	regulator_put(dsi.vdds_dsi_reg);
-
 	iounmap(dsi.base);
 
 	DSSDBG("omap_dsi_exit\n");

drivers/video/omap2/dss/dss.h

@@ -169,6 +169,9 @@ unsigned long dss_clk_get_rate(enum dss_clock clk);
 int dss_need_ctx_restore(void);
 void dss_dump_clocks(struct seq_file *s);
 struct bus_type *dss_get_bus(void);
+struct regulator *dss_get_vdds_dsi(void);
+struct regulator *dss_get_vdds_sdi(void);
+struct regulator *dss_get_vdda_dac(void);
 
 /* display */
 int dss_suspend_all_devices(void);
@@ -261,7 +264,7 @@ void dsi_get_overlay_fifo_thresholds(enum omap_plane plane,
 		u32 *fifo_low, u32 *fifo_high);
 
 /* DPI */
-int dpi_init(void);
+int dpi_init(struct platform_device *pdev);
 void dpi_exit(void);
 int dpi_init_display(struct omap_dss_device *dssdev);
 

drivers/video/omap2/dss/venc.c

@@ -482,7 +482,7 @@ int venc_init(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	venc.vdda_dac_reg = regulator_get(&pdev->dev, "vdda_dac");
+	venc.vdda_dac_reg = dss_get_vdda_dac();
 	if (IS_ERR(venc.vdda_dac_reg)) {
 		iounmap(venc.base);
 		DSSERR("can't get VDDA_DAC regulator\n");
@@ -503,8 +503,6 @@ void venc_exit(void)
 {
 	omap_dss_unregister_driver(&venc_driver);
 
-	regulator_put(venc.vdda_dac_reg);
-
 	iounmap(venc.base);
 }