Merge tag 'drm-vc4-next-2016-05-02' of https://github.com/anholt/linux …

…into drm-next

This pull request brings in DPI panel support, gamma ramp support, and
render nodes for vc4.

* tag 'drm-vc4-next-2016-05-02' of https://github.com/anholt/linux:
  drm/vc4: Add missing render node support
  drm/vc4: Add support for gamma ramps.
  drm/vc4: Fix NULL deref in HDMI init error path
  drm/vc4: Add DPI driver
  drm: Add an encoder and connector type enum for DPI.

Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt

@@ -35,12 +35,22 @@ Optional properties for HDMI:
 		  as an interrupt/status bit in the HDMI controller
 		  itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt
 
+Required properties for DPI:
+- compatible:	Should be "brcm,bcm2835-dpi"
+- reg:		Physical base address and length of the registers
+- clocks:	a) core: The core clock the unit runs on
+		b) pixel: The pixel clock that feeds the pixelvalve
+- port:		Port node with a single endpoint connecting to the panel
+		  device, as defined in [1]
+
 Required properties for V3D:
 - compatible:	Should be "brcm,bcm2835-v3d"
 - reg:		Physical base address and length of the V3D's registers
 - interrupts:	The interrupt number
 		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
 
+[1] Documentation/devicetree/bindings/media/video-interfaces.txt
+
 Example:
 pixelvalve@7e807000 {
 	compatible = "brcm,bcm2835-pixelvalve2";
@@ -66,6 +76,22 @@ hdmi: hdmi@7e902000 {
 	clock-names = "pixel", "hdmi";
 };
 
+dpi: dpi@7e208000 {
+	compatible = "brcm,bcm2835-dpi";
+	reg = <0x7e208000 0x8c>;
+	clocks = <&clocks BCM2835_CLOCK_VPU>,
+	         <&clocks BCM2835_CLOCK_DPI>;
+	clock-names = "core", "pixel";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	port {
+		dpi_out: endpoint@0 {
+			remote-endpoint = <&panel_in>;
+		};
+	};
+};
+
 v3d: v3d@7ec00000 {
 	compatible = "brcm,bcm2835-v3d";
 	reg = <0x7ec00000 0x1000>;
@@ -75,3 +101,13 @@ v3d: v3d@7ec00000 {
 vc4: gpu {
 	compatible = "brcm,bcm2835-vc4";
 };
+
+panel: panel {
+	compatible = "ontat,yx700wv03", "simple-panel";
+
+	port {
+		panel_in: endpoint {
+			remote-endpoint = <&dpi_out>;
+		};
+	};
+};

drivers/gpu/drm/drm_crtc.c

@@ -168,6 +168,7 @@ static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
 	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
 	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
+	{ DRM_MODE_CONNECTOR_DPI, "DPI" },
 };
 
 static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
@@ -179,6 +180,7 @@ static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
 	{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
 	{ DRM_MODE_ENCODER_DSI, "DSI" },
 	{ DRM_MODE_ENCODER_DPMST, "DP MST" },
+	{ DRM_MODE_ENCODER_DPI, "DPI" },
 };
 
 static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {

drivers/gpu/drm/vc4/Kconfig

@@ -5,6 +5,7 @@ config DRM_VC4
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_GEM_CMA_HELPER
+	select DRM_PANEL
 	help
 	  Choose this option if you have a system that has a Broadcom
 	  VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.

drivers/gpu/drm/vc4/Makefile

@@ -7,6 +7,7 @@ vc4-y := \
 	vc4_bo.o \
 	vc4_crtc.o \
 	vc4_drv.o \
+	vc4_dpi.o \
 	vc4_kms.o \
 	vc4_gem.o \
 	vc4_hdmi.o \

drivers/gpu/drm/vc4/vc4_crtc.c

@@ -49,6 +49,10 @@ struct vc4_crtc {
 	/* Which HVS channel we're using for our CRTC. */
 	int channel;
 
+	u8 lut_r[256];
+	u8 lut_g[256];
+	u8 lut_b[256];
+
 	struct drm_pending_vblank_event *event;
 };
 
@@ -147,6 +151,46 @@ static void vc4_crtc_destroy(struct drm_crtc *crtc)
 	drm_crtc_cleanup(crtc);
 }
 
+static void
+vc4_crtc_lut_load(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	u32 i;
+
+	/* The LUT memory is laid out with each HVS channel in order,
+	 * each of which takes 256 writes for R, 256 for G, then 256
+	 * for B.
+	 */
+	HVS_WRITE(SCALER_GAMADDR,
+		  SCALER_GAMADDR_AUTOINC |
+		  (vc4_crtc->channel * 3 * crtc->gamma_size));
+
+	for (i = 0; i < crtc->gamma_size; i++)
+		HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_r[i]);
+	for (i = 0; i < crtc->gamma_size; i++)
+		HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_g[i]);
+	for (i = 0; i < crtc->gamma_size; i++)
+		HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);
+}
+
+static void
+vc4_crtc_gamma_set(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
+		   uint32_t start, uint32_t size)
+{
+	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
+	u32 i;
+
+	for (i = start; i < start + size; i++) {
+		vc4_crtc->lut_r[i] = r[i] >> 8;
+		vc4_crtc->lut_g[i] = g[i] >> 8;
+		vc4_crtc->lut_b[i] = b[i] >> 8;
+	}
+
+	vc4_crtc_lut_load(crtc);
+}
+
 static u32 vc4_get_fifo_full_level(u32 format)
 {
 	static const u32 fifo_len_bytes = 64;
@@ -260,8 +304,14 @@ static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
 
 	HVS_WRITE(SCALER_DISPBKGNDX(vc4_crtc->channel),
 		  SCALER_DISPBKGND_AUTOHS |
+		  SCALER_DISPBKGND_GAMMA |
 		  (interlace ? SCALER_DISPBKGND_INTERLACE : 0));
 
+	/* Reload the LUT, since the SRAMs would have been disabled if
+	 * all CRTCs had SCALER_DISPBKGND_GAMMA unset at once.
+	 */
+	vc4_crtc_lut_load(crtc);
+
 	if (debug_dump_regs) {
 		DRM_INFO("CRTC %d regs after:\n", drm_crtc_index(crtc));
 		vc4_crtc_dump_regs(vc4_crtc);
@@ -613,6 +663,7 @@ static const struct drm_crtc_funcs vc4_crtc_funcs = {
 	.reset = drm_atomic_helper_crtc_reset,
 	.atomic_duplicate_state = vc4_crtc_duplicate_state,
 	.atomic_destroy_state = vc4_crtc_destroy_state,
+	.gamma_set = vc4_crtc_gamma_set,
 };
 
 static const struct drm_crtc_helper_funcs vc4_crtc_helper_funcs = {
@@ -711,6 +762,7 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	primary_plane->crtc = crtc;
 	vc4->crtc[drm_crtc_index(crtc)] = vc4_crtc;
 	vc4_crtc->channel = vc4_crtc->data->hvs_channel;
+	drm_mode_crtc_set_gamma_size(crtc, ARRAY_SIZE(vc4_crtc->lut_r));
 
 	/* Set up some arbitrary number of planes.  We're not limited
 	 * by a set number of physical registers, just the space in
@@ -751,6 +803,12 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 
 	vc4_set_crtc_possible_masks(drm, crtc);
 
+	for (i = 0; i < crtc->gamma_size; i++) {
+		vc4_crtc->lut_r[i] = i;
+		vc4_crtc->lut_g[i] = i;
+		vc4_crtc->lut_b[i] = i;
+	}
+
 	platform_set_drvdata(pdev, vc4_crtc);
 
 	return 0;

drivers/gpu/drm/vc4/vc4_debugfs.c

@@ -17,6 +17,7 @@
 
 static const struct drm_info_list vc4_debugfs_list[] = {
 	{"bo_stats", vc4_bo_stats_debugfs, 0},
+	{"dpi_regs", vc4_dpi_debugfs_regs, 0},
 	{"hdmi_regs", vc4_hdmi_debugfs_regs, 0},
 	{"hvs_regs", vc4_hvs_debugfs_regs, 0},
 	{"crtc0_regs", vc4_crtc_debugfs_regs, 0, (void *)(uintptr_t)0},