Merge tag 'zxdrm-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into drm-next

ZTE zxdrm driver support for 4.10:

This is the initial ZTE VOU display controller DRM/KMS driver.  There
are still some features to be added, like overlay plane, scaling, and
more output devices support.  But it's already useful with dual CRTCs
and HDMI display working.

[airlied: use drm_format_plane_cpp instead of legacy api]
* tag 'zxdrm-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
  MAINTAINERS: add an entry for ZTE ZX DRM driver
  drm: zte: add initial vou drm driver
  dt-bindings: add bindings doc for ZTE VOU display controller

1 files changed, 299 insertions, 0 deletions

diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
new file mode 100644
index 000000000000..546eb92a94e8
--- /dev/null
+++ b/drivers/gpu/drm/zte/zx_plane.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright 2016 Linaro Ltd.
+ * Copyright 2016 ZTE Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drmP.h>
+
+#include "zx_drm_drv.h"
+#include "zx_plane.h"
+#include "zx_plane_regs.h"
+#include "zx_vou.h"
+
+struct zx_plane {
+	struct drm_plane plane;
+	void __iomem *layer;
+	void __iomem *csc;
+	void __iomem *hbsc;
+	void __iomem *rsz;
+};
+
+#define to_zx_plane(plane)	container_of(plane, struct zx_plane, plane)
+
+static const uint32_t gl_formats[] = {
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_ARGB4444,
+};
+
+static int zx_gl_plane_atomic_check(struct drm_plane *plane,
+				    struct drm_plane_state *plane_state)
+{
+	struct drm_framebuffer *fb = plane_state->fb;
+	struct drm_crtc *crtc = plane_state->crtc;
+	struct drm_crtc_state *crtc_state;
+	struct drm_rect clip;
+
+	if (!crtc || !fb)
+		return 0;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state,
+							crtc);
+	if (WARN_ON(!crtc_state))
+		return -EINVAL;
+
+	/* nothing to check when disabling or disabled */
+	if (!crtc_state->enable)
+		return 0;
+
+	/* plane must be enabled */
+	if (!plane_state->crtc)
+		return -EINVAL;
+
+	clip.x1 = 0;
+	clip.y1 = 0;
+	clip.x2 = crtc_state->adjusted_mode.hdisplay;
+	clip.y2 = crtc_state->adjusted_mode.vdisplay;
+
+	return drm_plane_helper_check_state(plane_state, &clip,
+					    DRM_PLANE_HELPER_NO_SCALING,
+					    DRM_PLANE_HELPER_NO_SCALING,
+					    false, true);
+}
+
+static int zx_gl_get_fmt(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XRGB8888:
+		return GL_FMT_ARGB8888;
+	case DRM_FORMAT_RGB888:
+		return GL_FMT_RGB888;
+	case DRM_FORMAT_RGB565:
+		return GL_FMT_RGB565;
+	case DRM_FORMAT_ARGB1555:
+		return GL_FMT_ARGB1555;
+	case DRM_FORMAT_ARGB4444:
+		return GL_FMT_ARGB4444;
+	default:
+		WARN_ONCE(1, "invalid pixel format %d\n", format);
+		return -EINVAL;
+	}
+}
+
+static inline void zx_gl_set_update(struct zx_plane *zplane)
+{
+	void __iomem *layer = zplane->layer;
+
+	zx_writel_mask(layer + GL_CTRL0, GL_UPDATE, GL_UPDATE);
+}
+
+static inline void zx_gl_rsz_set_update(struct zx_plane *zplane)
+{
+	zx_writel(zplane->rsz + RSZ_ENABLE_CFG, 1);
+}
+
+void zx_plane_set_update(struct drm_plane *plane)
+{
+	struct zx_plane *zplane = to_zx_plane(plane);
+
+	zx_gl_rsz_set_update(zplane);
+	zx_gl_set_update(zplane);
+}
+
+static void zx_gl_rsz_setup(struct zx_plane *zplane, u32 src_w, u32 src_h,
+			    u32 dst_w, u32 dst_h)
+{
+	void __iomem *rsz = zplane->rsz;
+
+	zx_writel(rsz + RSZ_SRC_CFG, RSZ_VER(src_h - 1) | RSZ_HOR(src_w - 1));
+	zx_writel(rsz + RSZ_DEST_CFG, RSZ_VER(dst_h - 1) | RSZ_HOR(dst_w - 1));
+
+	zx_gl_rsz_set_update(zplane);
+}
+
+static void zx_gl_plane_atomic_update(struct drm_plane *plane,
+				      struct drm_plane_state *old_state)
+{
+	struct zx_plane *zplane = to_zx_plane(plane);
+	struct drm_framebuffer *fb = plane->state->fb;
+	struct drm_gem_cma_object *cma_obj;
+	void __iomem *layer = zplane->layer;
+	void __iomem *csc = zplane->csc;
+	void __iomem *hbsc = zplane->hbsc;
+	u32 src_x, src_y, src_w, src_h;
+	u32 dst_x, dst_y, dst_w, dst_h;
+	unsigned int bpp;
+	uint32_t format;
+	dma_addr_t paddr;
+	u32 stride;
+	int fmt;
+
+	if (!fb)
+		return;
+
+	format = fb->pixel_format;
+	stride = fb->pitches[0];
+
+	src_x = plane->state->src_x >> 16;
+	src_y = plane->state->src_y >> 16;
+	src_w = plane->state->src_w >> 16;
+	src_h = plane->state->src_h >> 16;
+
+	dst_x = plane->state->crtc_x;
+	dst_y = plane->state->crtc_y;
+	dst_w = plane->state->crtc_w;
+	dst_h = plane->state->crtc_h;
+
+	bpp = drm_format_plane_cpp(format, 0);
+
+	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	paddr = cma_obj->paddr + fb->offsets[0];
+	paddr += src_y * stride + src_x * bpp / 8;
+	zx_writel(layer + GL_ADDR, paddr);
+
+	/* Set up source height/width register */
+	zx_writel(layer + GL_SRC_SIZE, GL_SRC_W(src_w) | GL_SRC_H(src_h));
+
+	/* Set up start position register */
+	zx_writel(layer + GL_POS_START, GL_POS_X(dst_x) | GL_POS_Y(dst_y));
+
+	/* Set up end position register */
+	zx_writel(layer + GL_POS_END,
+		  GL_POS_X(dst_x + dst_w) | GL_POS_Y(dst_y + dst_h));
+
+	/* Set up stride register */
+	zx_writel(layer + GL_STRIDE, stride & 0xffff);
+
+	/* Set up graphic layer data format */
+	fmt = zx_gl_get_fmt(format);
+	if (fmt >= 0)
+		zx_writel_mask(layer + GL_CTRL1, GL_DATA_FMT_MASK,
+			       fmt << GL_DATA_FMT_SHIFT);
+
+	/* Initialize global alpha with a sane value */
+	zx_writel_mask(layer + GL_CTRL2, GL_GLOBAL_ALPHA_MASK,
+		       0xff << GL_GLOBAL_ALPHA_SHIFT);
+
+	/* Setup CSC for the GL */
+	if (dst_h > 720)
+		zx_writel_mask(csc + CSC_CTRL0, CSC_COV_MODE_MASK,
+			       CSC_BT709_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT);
+	else
+		zx_writel_mask(csc + CSC_CTRL0, CSC_COV_MODE_MASK,
+			       CSC_BT601_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT);
+	zx_writel_mask(csc + CSC_CTRL0, CSC_WORK_ENABLE, CSC_WORK_ENABLE);
+
+	/* Always use scaler since it exists (set for not bypass) */
+	zx_writel_mask(layer + GL_CTRL3, GL_SCALER_BYPASS_MODE,
+		       GL_SCALER_BYPASS_MODE);
+
+	zx_gl_rsz_setup(zplane, src_w, src_h, dst_w, dst_h);
+
+	/* Enable HBSC block */
+	zx_writel_mask(hbsc + HBSC_CTRL0, HBSC_CTRL_EN, HBSC_CTRL_EN);
+
+	zx_gl_set_update(zplane);
+}
+
+static const struct drm_plane_helper_funcs zx_gl_plane_helper_funcs = {
+	.atomic_check = zx_gl_plane_atomic_check,
+	.atomic_update = zx_gl_plane_atomic_update,
+};
+
+static void zx_plane_destroy(struct drm_plane *plane)
+{
+	drm_plane_helper_disable(plane);
+	drm_plane_cleanup(plane);
+}
+
+static const struct drm_plane_funcs zx_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = zx_plane_destroy,
+	.reset = drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+static void zx_plane_hbsc_init(struct zx_plane *zplane)
+{
+	void __iomem *hbsc = zplane->hbsc;
+
+	/*
+	 *  Initialize HBSC block with a sane configuration per recommedation
+	 *  from ZTE BSP code.
+	 */
+	zx_writel(hbsc + HBSC_SATURATION, 0x200);
+	zx_writel(hbsc + HBSC_HUE, 0x0);
+	zx_writel(hbsc + HBSC_BRIGHT, 0x0);
+	zx_writel(hbsc + HBSC_CONTRAST, 0x200);
+
+	zx_writel(hbsc + HBSC_THRESHOLD_COL1, (0x3ac << 16) | 0x40);
+	zx_writel(hbsc + HBSC_THRESHOLD_COL2, (0x3c0 << 16) | 0x40);
+	zx_writel(hbsc + HBSC_THRESHOLD_COL3, (0x3c0 << 16) | 0x40);
+}
+
+struct drm_plane *zx_plane_init(struct drm_device *drm, struct device *dev,
+				struct zx_layer_data *data,
+				enum drm_plane_type type)
+{
+	const struct drm_plane_helper_funcs *helper;
+	struct zx_plane *zplane;
+	struct drm_plane *plane;
+	const uint32_t *formats;
+	unsigned int format_count;
+	int ret;
+
+	zplane = devm_kzalloc(dev, sizeof(*zplane), GFP_KERNEL);
+	if (!zplane)
+		return ERR_PTR(-ENOMEM);
+
+	plane = &zplane->plane;
+
+	zplane->layer = data->layer;
+	zplane->hbsc = data->hbsc;
+	zplane->csc = data->csc;
+	zplane->rsz = data->rsz;
+
+	zx_plane_hbsc_init(zplane);
+
+	switch (type) {
+	case DRM_PLANE_TYPE_PRIMARY:
+		helper = &zx_gl_plane_helper_funcs;
+		formats = gl_formats;
+		format_count = ARRAY_SIZE(gl_formats);
+		break;
+	case DRM_PLANE_TYPE_OVERLAY:
+		/* TODO: add video layer (vl) support */
+		break;
+	default:
+		return ERR_PTR(-ENODEV);
+	}
+
+	ret = drm_universal_plane_init(drm, plane, VOU_CRTC_MASK,
+				       &zx_plane_funcs, formats, format_count,
+				       type, NULL);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "failed to init universal plane: %d\n", ret);
+		return ERR_PTR(ret);
+	}
+
+	drm_plane_helper_add(plane, helper);
+
+	return plane;
+}