diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0295-usb-dwc_otg-Use-dma-allocation-for-mphi-dummy_send-b.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0295-usb-dwc_otg-Use-dma-allocation-for-mphi-dummy_send-b.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0295-usb-dwc_otg-Use-dma-allocation-for-mphi-dummy_send-b.patch b/target/linux/brcm2708/patches-4.19/950-0295-usb-dwc_otg-Use-dma-allocation-for-mphi-dummy_send-b.patch new file mode 100644 index 0000000000..edc9336804 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0295-usb-dwc_otg-Use-dma-allocation-for-mphi-dummy_send-b.patch @@ -0,0 +1,74 @@ +From f0d93c5098283f88ea1de3af152a190177da8f36 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Wed, 30 Jan 2019 17:47:51 +0000 +Subject: [PATCH] usb: dwc_otg: Use dma allocation for mphi dummy_send + buffer + +The FIQ driver used a kzalloc'ed buffer for dummy_send, +passing a kernel virtual address to the hardware block. +The buffer is only ever used for a dummy read, so it +should be harmless, but there is the chance that it will +cause exceptions. + +Use a dma allocation so that we have a genuine bus address, +and read from that. +Free the allocation when done for good measure. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 4 ++-- + drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h | 1 + + drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 5 ++++- + 3 files changed, 7 insertions(+), 3 deletions(-) + +--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c +@@ -1347,7 +1347,7 @@ void notrace dwc_otg_fiq_fsm(struct fiq_ + /* We got an interrupt, didn't handle it. */ + if (kick_irq) { + state->mphi_int_count++; +- FIQ_WRITE(state->mphi_regs.outdda, (int) state->dummy_send); ++ FIQ_WRITE(state->mphi_regs.outdda, state->dummy_send_dma); + FIQ_WRITE(state->mphi_regs.outddb, (1<<29)); + + } +@@ -1408,7 +1408,7 @@ void notrace dwc_otg_fiq_nop(struct fiq_ + FIQ_WRITE(state->dwc_regs_base + GINTMSK, gintmsk.d32); + /* Force a clear before another dummy send */ + FIQ_WRITE(state->mphi_regs.intstat, (1<<29)); +- FIQ_WRITE(state->mphi_regs.outdda, (int) state->dummy_send); ++ FIQ_WRITE(state->mphi_regs.outdda, state->dummy_send_dma); + FIQ_WRITE(state->mphi_regs.outddb, (1<<29)); + + } +--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h ++++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h +@@ -352,6 +352,7 @@ struct fiq_state { + dma_addr_t dma_base; + struct fiq_dma_blob *fiq_dmab; + void *dummy_send; ++ dma_addr_t dummy_send_dma; + gintmsk_data_t gintmsk_saved; + haintmsk_data_t haintmsk_saved; + int mphi_int_count; +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c +@@ -929,6 +929,8 @@ static void dwc_otg_hcd_free(dwc_otg_hcd + DWC_TIMER_FREE(dwc_otg_hcd->conn_timer); + DWC_TASK_FREE(dwc_otg_hcd->reset_tasklet); + DWC_TASK_FREE(dwc_otg_hcd->completion_tasklet); ++ DWC_DMA_FREE(dev, 16, dwc_otg_hcd->fiq_state->dummy_send, ++ dwc_otg_hcd->fiq_state->dummy_send_dma); + DWC_FREE(dwc_otg_hcd->fiq_state); + + #ifdef DWC_DEV_SRPCAP +@@ -1021,7 +1023,8 @@ int dwc_otg_hcd_init(dwc_otg_hcd_t * hcd + for (i = 0; i < num_channels; i++) { + hcd->fiq_state->channel[i].fsm = FIQ_PASSTHROUGH; + } +- hcd->fiq_state->dummy_send = DWC_ALLOC_ATOMIC(16); ++ hcd->fiq_state->dummy_send = DWC_DMA_ALLOC_ATOMIC(dev, 16, ++ &hcd->fiq_state->dummy_send_dma); + + hcd->fiq_stack = DWC_ALLOC(sizeof(struct fiq_stack)); + if (!hcd->fiq_stack) { |