[PATCH 1/2] dmaengine: sh: rz-dmac: Add device_synchronize callback
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: 2022-07-19 14:49:43
Also in:
linux-renesas-soc
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
Some on-chip peripheral modules(for eg:- rspi) on RZ/G2L SoC use the same signal for both interrupt and DMA transfer requests. The signal works as a DMA transfer request signal by setting DMARS, and subsequent interrupt requests to the interrupt controller are masked. We can enable the interrupt by clearing the DMARS. This patch adds device_synchronize callback for clearing DMARS and thereby allowing DMA consumers to switch to interrupt mode. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- drivers/dma/sh/rz-dmac.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index ee2872e7d64c..675e6d5319d7 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c@@ -630,6 +630,14 @@ static void rz_dmac_virt_desc_free(struct virt_dma_desc *vd) */ } +static void rz_dmac_device_synchronize(struct dma_chan *chan) +{ + struct rz_dmac_chan *channel = to_rz_dmac_chan(chan); + struct rz_dmac *dmac = to_rz_dmac(chan->device); + + rz_dmac_set_dmars_register(dmac, channel->index, 0); +} + /* * ----------------------------------------------------------------------------- * IRQ handling
@@ -909,6 +917,7 @@ static int rz_dmac_probe(struct platform_device *pdev) engine->device_config = rz_dmac_config; engine->device_terminate_all = rz_dmac_terminate_all; engine->device_issue_pending = rz_dmac_issue_pending; + engine->device_synchronize = rz_dmac_device_synchronize; engine->copy_align = DMAENGINE_ALIGN_1_BYTE; dma_set_max_seg_size(engine->dev, U32_MAX);
--
2.25.1