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Subject[PATCH v2 1/3] drm/v3d: Add support for V3D v4.2.
Date
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.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
drivers/gpu/drm/v3d/v3d_drv.c | 19 +++++++++++++++----
drivers/gpu/drm/v3d/v3d_drv.h | 1 +
drivers/gpu/drm/v3d/v3d_gem.c | 12 +++++++++++-
drivers/gpu/drm/v3d/v3d_irq.c | 27 +++++++++++++++++++++------
4 files changed, 48 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index dd842af8b531..aef46de55b6a 100644
--- 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_gem_framebuffer_helper.h>
#include <drm/drm_fb_helper.h>
@@ -497,10 +498,6 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
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;
@@ -515,6 +512,20 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
WARN_ON(v3d->cores > 1); /* multicore not yet implemented */

+ if (v3d->ver >= 42) {
+ v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(v3d->reset)) {
+ ret = PTR_ERR(v3d->reset);
+ dev_err(dev, "Failed to get reset control: %ld\n",
+ ret);
+ goto dev_free;
+ }
+ } else {
+ ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
+ if (ret)
+ goto dev_free;
+ }
+
if (v3d->ver < 41) {
ret = map_regs(v3d, &v3d->gca_regs, "gca");
if (ret)
diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index 239b56d76f3e..b5732cf897fe 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -48,6 +48,7 @@ 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;
diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 803f31467ec1..3ee3ae4d3cac 100644
--- 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);
}
diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
index 69338da70ddc..2ad0c5865edd 100644
--- 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->ver >= 42 && status == IRQ_NONE)
+ return v3d_hub_irq(irq, arg);
+
return status;
}

@@ -170,12 +179,18 @@ 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);
- ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
- v3d_irq, IRQF_SHARED,
- "v3d_core0", v3d);
+ if (v3d->ver >= 42) {
+ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
+ v3d_irq, IRQF_SHARED,
+ "v3d", v3d);
+ } else {
+ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 0),
+ v3d_hub_irq, IRQF_SHARED,
+ "v3d_hub", v3d);
+ ret = devm_request_irq(v3d->dev, platform_get_irq(v3d->pdev, 1),
+ v3d_irq, IRQF_SHARED,
+ "v3d_core0", v3d);
+ }
if (ret)
dev_err(v3d->dev, "IRQ setup failed: %d\n", ret);

--
2.20.1
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