--- /dev/null
+From b0e7b8814e74be0559e07f737ef18cc3709d4ac4 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Thu, 4 Oct 2018 17:22:43 -0700
+Subject: [PATCH] drm/v3d: Add support for V3D v4.2.
+
+No compatible string for it yet, just the version-dependent changes.
+They've now tied the hub and the core interrupt lines into a single
+interrupt line coming out of the block. It also turns out I made a
+mistake in modeling the V3D v3.3 and v4.1 bridge as a part of V3D
+itself -- the bridge is going away in favor of an external reset
+controller in a larger HW module.
+
+v2: Use consistent checks for whether we're on 4.2, and fix a leak in
+ an error path.
+v3: Use more general means of determining if the current 4.2 changes
+ are in place, as apparently other platforms may switch back (noted
+ by Dave). Update the binding doc.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ .../devicetree/bindings/gpu/brcm,bcm-v3d.txt | 11 ++++--
+ drivers/gpu/drm/v3d/v3d_drv.c | 21 +++++++++---
+ drivers/gpu/drm/v3d/v3d_drv.h | 2 ++
+ drivers/gpu/drm/v3d/v3d_gem.c | 12 ++++++-
+ drivers/gpu/drm/v3d/v3d_irq.c | 34 ++++++++++++++-----
+ 5 files changed, 63 insertions(+), 17 deletions(-)
+
+--- a/Documentation/devicetree/bindings/gpu/brcm,bcm-v3d.txt
++++ b/Documentation/devicetree/bindings/gpu/brcm,bcm-v3d.txt
+@@ -6,15 +6,20 @@ For V3D 2.x, see brcm,bcm-vc4.txt.
+ Required properties:
+ - compatible: Should be "brcm,7268-v3d" or "brcm,7278-v3d"
+ - reg: Physical base addresses and lengths of the register areas
+-- reg-names: Names for the register areas. The "hub", "bridge", and "core0"
++- reg-names: Names for the register areas. The "hub" and "core0"
+ register areas are always required. The "gca" register area
+- is required if the GCA cache controller is present.
++ is required if the GCA cache controller is present. The
++ "bridge" register area is required if an external reset
++ controller is not present.
+ - interrupts: The interrupt numbers. The first interrupt is for the hub,
+- while the following interrupts are for the cores.
++ while the following interrupts are separate interrupt lines
++ for the cores (if they don't share the hub's interrupt).
+ See bindings/interrupt-controller/interrupts.txt
+
+ Optional properties:
+ - clocks: The core clock the unit runs on
++- resets: The reset line for v3d, if not using a mapping of the bridge
++ See bindings/reset/reset.txt
+
+ v3d {
+ compatible = "brcm,7268-v3d";
+--- a/drivers/gpu/drm/v3d/v3d_drv.c
++++ b/drivers/gpu/drm/v3d/v3d_drv.c
+@@ -19,6 +19,7 @@
+ #include <linux/of_platform.h>
+ #include <linux/platform_device.h>
+ #include <linux/pm_runtime.h>
++#include <linux/reset.h>
+ #include <drm/drm_fb_cma_helper.h>
+ #include <drm/drm_fb_helper.h>
+
+@@ -265,10 +266,6 @@ static int v3d_platform_drm_probe(struct
+ v3d->pdev = pdev;
+ drm = &v3d->drm;
+
+- ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
+- if (ret)
+- goto dev_free;
+-
+ ret = map_regs(v3d, &v3d->hub_regs, "hub");
+ if (ret)
+ goto dev_free;
+@@ -283,6 +280,22 @@ static int v3d_platform_drm_probe(struct
+ v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
+ WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
+
++ v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
++ if (IS_ERR(v3d->reset)) {
++ ret = PTR_ERR(v3d->reset);
++
++ if (ret == -EPROBE_DEFER)
++ goto dev_free;
++
++ v3d->reset = NULL;
++ ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
++ if (ret) {
++ dev_err(dev,
++ "Failed to get reset control or bridge regs\n");
++ goto dev_free;
++ }
++ }
++
+ if (v3d->ver < 41) {
+ ret = map_regs(v3d, &v3d->gca_regs, "gca");
+ if (ret)
+--- a/drivers/gpu/drm/v3d/v3d_drv.h
++++ b/drivers/gpu/drm/v3d/v3d_drv.h
+@@ -34,6 +34,7 @@ struct v3d_dev {
+ * and revision.
+ */
+ int ver;
++ bool single_irq_line;
+
+ struct device *dev;
+ struct platform_device *pdev;
+@@ -42,6 +43,7 @@ struct v3d_dev {
+ void __iomem *bridge_regs;
+ void __iomem *gca_regs;
+ struct clk *clk;
++ struct reset_control *reset;
+
+ /* Virtual and DMA addresses of the single shared page table. */
+ volatile u32 *pt;
+--- a/drivers/gpu/drm/v3d/v3d_gem.c
++++ b/drivers/gpu/drm/v3d/v3d_gem.c
+@@ -6,6 +6,7 @@
+ #include <linux/module.h>
+ #include <linux/platform_device.h>
+ #include <linux/pm_runtime.h>
++#include <linux/reset.h>
+ #include <linux/device.h>
+ #include <linux/io.h>
+ #include <linux/sched/signal.h>
+@@ -69,7 +70,7 @@ v3d_idle_gca(struct v3d_dev *v3d)
+ }
+
+ static void
+-v3d_reset_v3d(struct v3d_dev *v3d)
++v3d_reset_by_bridge(struct v3d_dev *v3d)
+ {
+ int version = V3D_BRIDGE_READ(V3D_TOP_GR_BRIDGE_REVISION);
+
+@@ -89,6 +90,15 @@ v3d_reset_v3d(struct v3d_dev *v3d)
+ V3D_TOP_GR_BRIDGE_SW_INIT_1_V3D_CLK_108_SW_INIT);
+ V3D_BRIDGE_WRITE(V3D_TOP_GR_BRIDGE_SW_INIT_1, 0);
+ }
++}
++
++static void
++v3d_reset_v3d(struct v3d_dev *v3d)
++{
++ if (v3d->reset)
++ reset_control_reset(v3d->reset);
++ else
++ v3d_reset_by_bridge(v3d);
+
+ v3d_init_hw_state(v3d);
+ }
+--- a/drivers/gpu/drm/v3d/v3d_irq.c
++++ b/drivers/gpu/drm/v3d/v3d_irq.c
+@@ -27,6 +27,9 @@
+ V3D_HUB_INT_MMU_CAP | \
+ V3D_HUB_INT_TFUC))
+
++static irqreturn_t
++v3d_hub_irq(int irq, void *arg);
++
+ static void
+ v3d_overflow_mem_work(struct work_struct *work)
+ {
+@@ -112,6 +115,12 @@ v3d_irq(int irq, void *arg)
+ if (intsts & V3D_INT_GMPV)
+ dev_err(v3d->dev, "GMP violation\n");
+
++ /* V3D 4.2 wires the hub and core IRQs together, so if we &
++ * didn't see the common one then check hub for MMU IRQs.
++ */
++ if (v3d->single_irq_line && status == IRQ_NONE)
++ return v3d_hub_irq(irq, arg);
++
+ return status;
+ }
+
+@@ -170,15 +179,22 @@ v3d_irq_init(struct v3d_dev *v3d)
+ V3D_CORE_WRITE(core, V3D_CTL_INT_CLR, V3D_CORE_IRQS);
+ V3D_WRITE(V3D_HUB_INT_CLR, V3D_HUB_IRQS);
+
+- ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
+- v3d_hub_irq, IRQF_SHARED,
+- "v3d_hub", v3d);
+- if (ret)
+- goto fail;
+-
+- ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
+- v3d_irq, IRQF_SHARED,
+- "v3d_core0", v3d);
++ if (platform_get_irq(v3d->pdev, 1) < 0) {
++ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
++ v3d_irq, IRQF_SHARED,
++ "v3d", v3d);
++ v3d->single_irq_line = true;
++ } else {
++ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
++ v3d_hub_irq, IRQF_SHARED,
++ "v3d_hub", v3d);
++ if (ret)
++ goto fail;
++
++ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
++ v3d_irq, IRQF_SHARED,
++ "v3d_core0", v3d);
++ }
+ if (ret)
+ goto fail;
+
projects / openwrt / staging / dedeckeh.git / blobdiff