diff options
Diffstat (limited to 'recipes-kernel/linux/linux-toradex-rt-3.14.52/0004-imx-sdma-channel-use-raw-spinlock.patch')
| -rw-r--r-- | recipes-kernel/linux/linux-toradex-rt-3.14.52/0004-imx-sdma-channel-use-raw-spinlock.patch | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/recipes-kernel/linux/linux-toradex-rt-3.14.52/0004-imx-sdma-channel-use-raw-spinlock.patch b/recipes-kernel/linux/linux-toradex-rt-3.14.52/0004-imx-sdma-channel-use-raw-spinlock.patch deleted file mode 100644 index da36213..0000000 --- a/recipes-kernel/linux/linux-toradex-rt-3.14.52/0004-imx-sdma-channel-use-raw-spinlock.patch +++ /dev/null @@ -1,95 +0,0 @@ -Work around CPU stalls in the imx-sdma driver by replacing spinlocks -with raw spinlocks. This prevents preemption during the spinlock's -critical section, as is the case on non PREEMPT_RT kernels. - -Without this patch, the following error can occur, for example when -using the audio codec on an iMX6Q Sabre SD board: - -INFO: rcu_preempt self-detected stall on CPU { 0} (t=2100 jiffies g=106 c=105 q=93) -CPU: 0 PID: 120 Comm: irq/34-sdma Not tainted 3.14.28-rt25-1.0.0_ga+g91cf351 #1 -[<80014a8c>] (unwind_backtrace) from [<8001173c>] (show_stack+0x10/0x14) -[<8001173c>] (show_stack) from [<806ee750>] (dump_stack+0x7c/0xc8) -[<806ee750>] (dump_stack) from [<800771c8>] (rcu_check_callbacks+0x454/0x888) -[<800771c8>] (rcu_check_callbacks) from [<80037f28>] (update_process_times+0x40/0x5c) -[<80037f28>] (update_process_times) from [<80082230>] (tick_sched_timer+0x4c/0x78) -[<80082230>] (tick_sched_timer) from [<8004bf30>] (__run_hrtimer.isra.34+0x74/0x124) -[<8004bf30>] (__run_hrtimer.isra.34) from [<8004cbb0>] (hrtimer_interrupt+0x154/0x3ac) -[<8004cbb0>] (hrtimer_interrupt) from [<80014464>] (twd_handler+0x30/0x38) -[<80014464>] (twd_handler) from [<8006fa2c>] (handle_percpu_devid_irq+0x6c/0x84) -[<8006fa2c>] (handle_percpu_devid_irq) from [<8006bc64>] (generic_handle_irq+0x2c/0x3c) -[<8006bc64>] (generic_handle_irq) from [<8000ed8c>] (handle_IRQ+0x40/0x90) -[<8000ed8c>] (handle_IRQ) from [<8000856c>] (gic_handle_irq+0x2c/0x5c) -[<8000856c>] (gic_handle_irq) from [<80012240>] (__irq_svc+0x40/0x84) -Exception stack(0xa840feb8 to 0xa840ff00) -fea0: a8007a28 00000002 -fec0: 00000001 0000a6a6 a80079c0 a8007a28 a83ea080 00000000 a80079c0 a83ea080 -fee0: 285190f0 00000000 00000000 a840ff00 8006d04c 806f3070 20030113 ffffffff -[<80012240>] (__irq_svc) from [<806f3070>] (_raw_spin_unlock_irq+0x20/0x60) -[<806f3070>] (_raw_spin_unlock_irq) from [<8006d04c>] (irq_finalize_oneshot.part.37+0x70/0xcc) -[<8006d04c>] (irq_finalize_oneshot.part.37) from [<8006d148>] (irq_forced_thread_fn+0x60/0x64) -[<8006d148>] (irq_forced_thread_fn) from [<8006d3dc>] (irq_thread+0x138/0x1a4) -[<8006d3dc>] (irq_thread) from [<8004913c>] (kthread+0xbc/0xd4) -[<8004913c>] (kthread) from [<8000e538>] (ret_from_fork+0x14/0x3c) - -Upstream-Status: Pending - -Signed-off-by: Dominic Sacré <dominic.sacre@gmx.de> - -diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c -index bae2ea8..74ff5a0 100644 ---- a/drivers/dma/imx-sdma.c -+++ b/drivers/dma/imx-sdma.c -@@ -343,7 +343,7 @@ struct sdma_engine { - struct dma_device dma_device; - struct clk *clk_ipg; - struct clk *clk_ahb; -- spinlock_t channel_0_lock; -+ raw_spinlock_t channel_0_lock; - u32 script_number; - struct sdma_script_start_addrs *script_addrs; - const struct sdma_driver_data *drvdata; -@@ -593,7 +593,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, - return -ENOMEM; - } - -- spin_lock_irqsave(&sdma->channel_0_lock, flags); -+ raw_spin_lock_irqsave(&sdma->channel_0_lock, flags); - - bd0->mode.command = C0_SETPM; - bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; -@@ -605,7 +605,7 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, - - ret = sdma_run_channel0(sdma); - -- spin_unlock_irqrestore(&sdma->channel_0_lock, flags); -+ raw_spin_unlock_irqrestore(&sdma->channel_0_lock, flags); - - if (use_iram) - gen_pool_free(sdma->iram_pool, (unsigned long)buf_virt, size); -@@ -880,7 +880,7 @@ static int sdma_load_context(struct sdma_channel *sdmac) - dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]); - dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]); - -- spin_lock_irqsave(&sdma->channel_0_lock, flags); -+ raw_spin_lock_irqsave(&sdma->channel_0_lock, flags); - - memset(context, 0, sizeof(*context)); - context->channel_state.pc = load_address; -@@ -906,7 +906,7 @@ static int sdma_load_context(struct sdma_channel *sdmac) - bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; - ret = sdma_run_channel0(sdma); - -- spin_unlock_irqrestore(&sdma->channel_0_lock, flags); -+ raw_spin_unlock_irqrestore(&sdma->channel_0_lock, flags); - - return ret; - } -@@ -1881,7 +1881,7 @@ static int __init sdma_probe(struct platform_device *pdev) - if (!sdma) - return -ENOMEM; - -- spin_lock_init(&sdma->channel_0_lock); -+ raw_spin_lock_init(&sdma->channel_0_lock); - - sdma->dev = &pdev->dev; - sdma->drvdata = drvdata; |