drm: rcar-du: Convert LVDS encoder code to bridge driver

The LVDS encoders used to be described in DT as part of the DU. They now
have their own DT node, linked to the DU using the OF graph bindings.
This allows moving internal LVDS encoder support to a separate driver
modelled as a DRM bridge. Backward compatibility is retained as legacy
DT is patched live to move to the new bindings.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

1 files changed, 0 insertions, 238 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
deleted file mode 100644
index 4defa8123eb2..000000000000
--- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * rcar_du_lvdsenc.c  --  R-Car Display Unit LVDS Encoder
- *
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
- *
- * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-
-#include "rcar_du_drv.h"
-#include "rcar_du_encoder.h"
-#include "rcar_du_lvdsenc.h"
-#include "rcar_lvds_regs.h"
-
-struct rcar_du_lvdsenc {
-	struct rcar_du_device *dev;
-
-	unsigned int index;
-	void __iomem *mmio;
-	struct clk *clock;
-	bool enabled;
-
-	enum rcar_lvds_input input;
-	enum rcar_lvds_mode mode;
-};
-
-static void rcar_lvds_write(struct rcar_du_lvdsenc *lvds, u32 reg, u32 data)
-{
-	iowrite32(data, lvds->mmio + reg);
-}
-
-static u32 rcar_lvds_lvdpllcr_gen2(unsigned int freq)
-{
-	if (freq < 39000)
-		return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_38M;
-	else if (freq < 61000)
-		return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_60M;
-	else if (freq < 121000)
-		return LVDPLLCR_CEEN | LVDPLLCR_COSEL | LVDPLLCR_PLLDLYCNT_121M;
-	else
-		return LVDPLLCR_PLLDLYCNT_150M;
-}
-
-static u32 rcar_lvds_lvdpllcr_gen3(unsigned int freq)
-{
-	if (freq < 42000)
-		return LVDPLLCR_PLLDIVCNT_42M;
-	else if (freq < 85000)
-		return LVDPLLCR_PLLDIVCNT_85M;
-	else if (freq < 128000)
-		return LVDPLLCR_PLLDIVCNT_128M;
-	else
-		return LVDPLLCR_PLLDIVCNT_148M;
-}
-
-static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds,
-				 struct rcar_du_crtc *rcrtc)
-{
-	const struct drm_display_mode *mode = &rcrtc->crtc.mode;
-	u32 lvdpllcr;
-	u32 lvdhcr;
-	u32 lvdcr0;
-	int ret;
-
-	if (lvds->enabled)
-		return 0;
-
-	ret = clk_prepare_enable(lvds->clock);
-	if (ret < 0)
-		return ret;
-
-	/*
-	 * Hardcode the channels and control signals routing for now.
-	 *
-	 * HSYNC -> CTRL0
-	 * VSYNC -> CTRL1
-	 * DISP  -> CTRL2
-	 * 0     -> CTRL3
-	 */
-	rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO |
-			LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC |
-			LVDCTRCR_CTR0SEL_HSYNC);
-
-	if (rcar_du_needs(lvds->dev, RCAR_DU_QUIRK_LVDS_LANES))
-		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3)
-		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1);
-	else
-		lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1)
-		       | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3);
-
-	rcar_lvds_write(lvds, LVDCHCR, lvdhcr);
-
-	/* PLL clock configuration. */
-	if (lvds->dev->info->gen < 3)
-		lvdpllcr = rcar_lvds_lvdpllcr_gen2(mode->clock);
-	else
-		lvdpllcr = rcar_lvds_lvdpllcr_gen3(mode->clock);
-	rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr);
-
-	/* Set the LVDS mode and select the input. */
-	lvdcr0 = lvds->mode << LVDCR0_LVMD_SHIFT;
-	if (rcrtc->index == 2)
-		lvdcr0 |= LVDCR0_DUSEL;
-	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
-
-	/* Turn all the channels on. */
-	rcar_lvds_write(lvds, LVDCR1,
-			LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
-			LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);
-
-	if (lvds->dev->info->gen < 3) {
-		/* Enable LVDS operation and turn the bias circuitry on. */
-		lvdcr0 |= LVDCR0_BEN | LVDCR0_LVEN;
-		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
-	}
-
-	/* Turn the PLL on. */
-	lvdcr0 |= LVDCR0_PLLON;
-	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
-
-	if (lvds->dev->info->gen > 2) {
-		/* Set LVDS normal mode. */
-		lvdcr0 |= LVDCR0_PWD;
-		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
-	}
-
-	/* Wait for the startup delay. */
-	usleep_range(100, 150);
-
-	/* Turn the output on. */
-	lvdcr0 |= LVDCR0_LVRES;
-	rcar_lvds_write(lvds, LVDCR0, lvdcr0);
-
-	lvds->enabled = true;
-
-	return 0;
-}
-
-static void rcar_du_lvdsenc_stop(struct rcar_du_lvdsenc *lvds)
-{
-	if (!lvds->enabled)
-		return;
-
-	rcar_lvds_write(lvds, LVDCR0, 0);
-	rcar_lvds_write(lvds, LVDCR1, 0);
-
-	clk_disable_unprepare(lvds->clock);
-
-	lvds->enabled = false;
-}
-
-int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds, struct drm_crtc *crtc,
-			   bool enable)
-{
-	if (!enable) {
-		rcar_du_lvdsenc_stop(lvds);
-		return 0;
-	} else if (crtc) {
-		struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
-		return rcar_du_lvdsenc_start(lvds, rcrtc);
-	} else
-		return -EINVAL;
-}
-
-void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds,
-				  struct drm_display_mode *mode)
-{
-	/*
-	 * The internal LVDS encoder has a restricted clock frequency operating
-	 * range (31MHz to 148.5MHz). Clamp the clock accordingly.
-	 */
-	mode->clock = clamp(mode->clock, 31000, 148500);
-}
-
-void rcar_du_lvdsenc_set_mode(struct rcar_du_lvdsenc *lvds,
-			      enum rcar_lvds_mode mode)
-{
-	lvds->mode = mode;
-}
-
-static int rcar_du_lvdsenc_get_resources(struct rcar_du_lvdsenc *lvds,
-					 struct platform_device *pdev)
-{
-	struct resource *mem;
-	char name[7];
-
-	sprintf(name, "lvds.%u", lvds->index);
-
-	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
-	lvds->mmio = devm_ioremap_resource(&pdev->dev, mem);
-	if (IS_ERR(lvds->mmio))
-		return PTR_ERR(lvds->mmio);
-
-	lvds->clock = devm_clk_get(&pdev->dev, name);
-	if (IS_ERR(lvds->clock)) {
-		dev_err(&pdev->dev, "failed to get clock for %s\n", name);
-		return PTR_ERR(lvds->clock);
-	}
-
-	return 0;
-}
-
-int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu)
-{
-	struct platform_device *pdev = to_platform_device(rcdu->dev);
-	struct rcar_du_lvdsenc *lvds;
-	unsigned int i;
-	int ret;
-
-	for (i = 0; i < rcdu->info->num_lvds; ++i) {
-		lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
-		if (lvds == NULL)
-			return -ENOMEM;
-
-		lvds->dev = rcdu;
-		lvds->index = i;
-		lvds->input = i ? RCAR_LVDS_INPUT_DU1 : RCAR_LVDS_INPUT_DU0;
-		lvds->enabled = false;
-
-		ret = rcar_du_lvdsenc_get_resources(lvds, pdev);
-		if (ret < 0)
-			return ret;
-
-		rcdu->lvds[i] = lvds;
-	}
-
-	return 0;
-}