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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0264-drm-vc4_dsi-Fix-DMA-channel-and-memory-leak-in-vc4-3.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0264-drm-vc4_dsi-Fix-DMA-channel-and-memory-leak-in-vc4-3.patch135
1 files changed, 135 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0264-drm-vc4_dsi-Fix-DMA-channel-and-memory-leak-in-vc4-3.patch b/target/linux/bcm27xx/patches-5.4/950-0264-drm-vc4_dsi-Fix-DMA-channel-and-memory-leak-in-vc4-3.patch
new file mode 100644
index 0000000000..9fd796850f
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0264-drm-vc4_dsi-Fix-DMA-channel-and-memory-leak-in-vc4-3.patch
@@ -0,0 +1,135 @@
+From cbda8e6de54f8a0f194e990f53e1cfad642af1be Mon Sep 17 00:00:00 2001
+From: Chris Miller <chris@mesl2.co.uk>
+Date: Wed, 26 Jun 2019 10:40:30 +0100
+Subject: [PATCH] drm: vc4_dsi: Fix DMA channel and memory leak in vc4
+ (#3012)
+
+Signed-off-by: Chris G Miller <chris@creative-electronics.net>
+---
+ drivers/gpu/drm/vc4/vc4_dsi.c | 35 ++++++++++++++++++++++++-----------
+ 1 file changed, 24 insertions(+), 11 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_dsi.c
++++ b/drivers/gpu/drm/vc4/vc4_dsi.c
+@@ -1485,9 +1485,11 @@ static int vc4_dsi_bind(struct device *d
+ /* DSI1 has a broken AXI slave that doesn't respond to writes
+ * from the ARM. It does handle writes from the DMA engine,
+ * so set up a channel for talking to it.
++ * Where possible managed resource providers are used, but the DMA channel
++ * must - if acquired - be explicitly released prior to taking an error exit path.
+ */
+ if (dsi->port == 1) {
+- dsi->reg_dma_mem = dma_alloc_coherent(dev, 4,
++ dsi->reg_dma_mem = dmam_alloc_coherent(dev, 4,
+ &dsi->reg_dma_paddr,
+ GFP_KERNEL);
+ if (!dsi->reg_dma_mem) {
+@@ -1506,6 +1508,8 @@ static int vc4_dsi_bind(struct device *d
+ return ret;
+ }
+
++ /* From here on, any error exits must release the dma channel */
++
+ /* Get the physical address of the device's registers. The
+ * struct resource for the regs gives us the bus address
+ * instead.
+@@ -1532,7 +1536,7 @@ static int vc4_dsi_bind(struct device *d
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get interrupt: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ dsi->escape_clock = devm_clk_get(dev, "escape");
+@@ -1540,7 +1544,7 @@ static int vc4_dsi_bind(struct device *d
+ ret = PTR_ERR(dsi->escape_clock);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get escape clock: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ dsi->pll_phy_clock = devm_clk_get(dev, "phy");
+@@ -1548,7 +1552,7 @@ static int vc4_dsi_bind(struct device *d
+ ret = PTR_ERR(dsi->pll_phy_clock);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get phy clock: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ dsi->pixel_clock = devm_clk_get(dev, "pixel");
+@@ -1556,7 +1560,7 @@ static int vc4_dsi_bind(struct device *d
+ ret = PTR_ERR(dsi->pixel_clock);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get pixel clock: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
+@@ -1571,26 +1575,28 @@ static int vc4_dsi_bind(struct device *d
+ if (ret == -ENODEV)
+ return 0;
+
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ if (panel) {
+ dsi->bridge = devm_drm_panel_bridge_add(dev, panel,
+ DRM_MODE_CONNECTOR_DSI);
+- if (IS_ERR(dsi->bridge))
+- return PTR_ERR(dsi->bridge);
++ if (IS_ERR(dsi->bridge)){
++ ret = PTR_ERR(dsi->bridge);
++ goto rel_dma_exit;
++ }
+ }
+
+ /* The esc clock rate is supposed to always be 100Mhz. */
+ ret = clk_set_rate(dsi->escape_clock, 100 * 1000000);
+ if (ret) {
+ dev_err(dev, "Failed to set esc clock: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+
+ ret = vc4_dsi_init_phy_clocks(dsi);
+ if (ret)
+- return ret;
++ goto rel_dma_exit;
+
+ if (dsi->port == 1)
+ vc4->dsi1 = dsi;
+@@ -1602,7 +1608,7 @@ static int vc4_dsi_bind(struct device *d
+ ret = drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
+ if (ret) {
+ dev_err(dev, "bridge attach failed: %d\n", ret);
+- return ret;
++ goto rel_dma_exit;
+ }
+ /* Disable the atomic helper calls into the bridge. We
+ * manually call the bridge pre_enable / enable / etc. calls
+@@ -1619,6 +1625,11 @@ static int vc4_dsi_bind(struct device *d
+ pm_runtime_enable(dev);
+
+ return 0;
++
++rel_dma_exit:
++ dma_release_channel(dsi->reg_dma_chan);
++
++ return ret;
+ }
+
+ static void vc4_dsi_unbind(struct device *dev, struct device *master,
+@@ -1633,6 +1644,8 @@ static void vc4_dsi_unbind(struct device
+
+ vc4_dsi_encoder_destroy(dsi->encoder);
+
++ dma_release_channel(dsi->reg_dma_chan);
++
+ if (dsi->port == 1)
+ vc4->dsi1 = NULL;
+ }