diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0176-drm-vc4-Fix-sleeps-during-the-IRQ-handler-for-DSI-tr.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0176-drm-vc4-Fix-sleeps-during-the-IRQ-handler-for-DSI-tr.patch | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0176-drm-vc4-Fix-sleeps-during-the-IRQ-handler-for-DSI-tr.patch b/target/linux/brcm2708/patches-4.14/950-0176-drm-vc4-Fix-sleeps-during-the-IRQ-handler-for-DSI-tr.patch deleted file mode 100644 index d6949b617b..0000000000 --- a/target/linux/brcm2708/patches-4.14/950-0176-drm-vc4-Fix-sleeps-during-the-IRQ-handler-for-DSI-tr.patch +++ /dev/null @@ -1,73 +0,0 @@ -From 659c52fe8a86264c5119c0592654898d09fe8f28 Mon Sep 17 00:00:00 2001 -From: Eric Anholt <eric@anholt.net> -Date: Fri, 13 Oct 2017 17:12:55 -0700 -Subject: [PATCH 176/454] drm/vc4: Fix sleeps during the IRQ handler for DSI - transactions. - -VC4's DSI1 has a bug where the AXI connection is broken for 32-bit -writes from the CPU, so we use the DMA engine to DMA 32-bit values -into registers instead. That sleeps, so we can't do it from the top -half. - -As a solution, use an interrupt thread so that all our writes happen -when sleeping is is allowed. - -v2: Use IRQF_ONESHOT (suggested by Boris) -v3: Style nitpicks. - -Signed-off-by: Eric Anholt <eric@anholt.net> -Link: https://patchwork.freedesktop.org/patch/msgid/20171014001255.32005-1-eric@anholt.net -Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> (v2) -(cherry picked from commit af0c8c10564aac5b6d67308129ec09c4ad5db476) ---- - drivers/gpu/drm/vc4/vc4_dsi.c | 32 ++++++++++++++++++++++++++++++-- - 1 file changed, 30 insertions(+), 2 deletions(-) - ---- a/drivers/gpu/drm/vc4/vc4_dsi.c -+++ b/drivers/gpu/drm/vc4/vc4_dsi.c -@@ -1383,6 +1383,27 @@ static void dsi_handle_error(struct vc4_ - *ret = IRQ_HANDLED; - } - -+/* -+ * Initial handler for port 1 where we need the reg_dma workaround. -+ * The register DMA writes sleep, so we can't do it in the top half. -+ * Instead we use IRQF_ONESHOT so that the IRQ gets disabled in the -+ * parent interrupt contrller until our interrupt thread is done. -+ */ -+static irqreturn_t vc4_dsi_irq_defer_to_thread_handler(int irq, void *data) -+{ -+ struct vc4_dsi *dsi = data; -+ u32 stat = DSI_PORT_READ(INT_STAT); -+ -+ if (!stat) -+ return IRQ_NONE; -+ -+ return IRQ_WAKE_THREAD; -+} -+ -+/* -+ * Normal IRQ handler for port 0, or the threaded IRQ handler for port -+ * 1 where we need the reg_dma workaround. -+ */ - static irqreturn_t vc4_dsi_irq_handler(int irq, void *data) - { - struct vc4_dsi *dsi = data; -@@ -1566,8 +1587,15 @@ static int vc4_dsi_bind(struct device *d - /* Clear any existing interrupt state. */ - DSI_PORT_WRITE(INT_STAT, DSI_PORT_READ(INT_STAT)); - -- ret = devm_request_irq(dev, platform_get_irq(pdev, 0), -- vc4_dsi_irq_handler, 0, "vc4 dsi", dsi); -+ if (dsi->reg_dma_mem) -+ ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), -+ vc4_dsi_irq_defer_to_thread_handler, -+ vc4_dsi_irq_handler, -+ IRQF_ONESHOT, -+ "vc4 dsi", dsi); -+ else -+ ret = devm_request_irq(dev, platform_get_irq(pdev, 0), -+ vc4_dsi_irq_handler, 0, "vc4 dsi", dsi); - if (ret) { - if (ret != -EPROBE_DEFER) - dev_err(dev, "Failed to get interrupt: %d\n", ret); |