[PATCH 08/11] dmaengine: xilinx_dpdma: stop using slave_id field
From: Arnd Bergmann <arnd@kernel.org>
Date: 2021-11-15 08:58:42
Also in:
alsa-devel, dri-devel, linux-arm-kernel, linux-arm-msm, linux-mmc, linux-serial, linux-spi, linux-staging, linux-tegra, lkml
Subsystem:
dma generic offload engine subsystem, drm drivers, drm drivers and misc gpu patches, drm drivers for xilinx, the rest, xilinx zynqmp dpdma driver · Maintainers:
Vinod Koul, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Laurent Pinchart, Tomi Valkeinen, Linus Torvalds
From: Arnd Bergmann <arnd@arndb.de> The display driver wants to pass a custom flag to the DMA engine driver, which it started doing by using the slave_id field that was traditionally used for a different purpose. As there is no longer a correct use for the slave_id field, it should really be removed, and the remaining users changed over to something different. The new mechanism for passing nonstandard settings is using the .peripheral_config field, so use that to pass a newly defined structure here, making it clear that this will not work in portable drivers. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/dma/xilinx/xilinx_dpdma.c | 12 ++++++++---- drivers/gpu/drm/xlnx/zynqmp_disp.c | 9 +++++++-- include/linux/dma/xilinx_dpdma.h | 11 +++++++++++ 3 files changed, 26 insertions(+), 6 deletions(-) create mode 100644 include/linux/dma/xilinx_dpdma.h
diff --git a/drivers/dma/xilinx/xilinx_dpdma.c b/drivers/dma/xilinx/xilinx_dpdma.c
index ce5c66e6897d..e2c1ef7a659c 100644
--- a/drivers/dma/xilinx/xilinx_dpdma.c
+++ b/drivers/dma/xilinx/xilinx_dpdma.c@@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/delay.h> +#include <linux/dma/xilinx_dpdma.h> #include <linux/dmaengine.h> #include <linux/dmapool.h> #include <linux/interrupt.h>
@@ -1273,6 +1274,7 @@ static int xilinx_dpdma_config(struct dma_chan *dchan, struct dma_slave_config *config) { struct xilinx_dpdma_chan *chan = to_xilinx_chan(dchan); + struct xilinx_dpdma_peripheral_config *pconfig; unsigned long flags; /*
@@ -1285,11 +1287,13 @@ static int xilinx_dpdma_config(struct dma_chan *dchan, spin_lock_irqsave(&chan->lock, flags); /* - * Abuse the slave_id to indicate that the channel is part of a video - * group. + * Abuse the peripheral_config to indicate that the channel is part + * of a video group. */ - if (chan->id <= ZYNQMP_DPDMA_VIDEO2) - chan->video_group = config->slave_id != 0; + pconfig = config->peripheral_config; + if (chan->id <= ZYNQMP_DPDMA_VIDEO2 && + config->peripheral_size == sizeof(*pconfig)) + chan->video_group = pconfig->video_group; spin_unlock_irqrestore(&chan->lock, flags);
diff --git a/drivers/gpu/drm/xlnx/zynqmp_disp.c b/drivers/gpu/drm/xlnx/zynqmp_disp.c
index ff2b308d8651..11c409cbc88e 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_disp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_disp.c@@ -24,6 +24,7 @@ #include <linux/clk.h> #include <linux/delay.h> +#include <linux/dma/xilinx_dpdma.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> #include <linux/module.h>
@@ -1058,14 +1059,18 @@ static void zynqmp_disp_layer_set_format(struct zynqmp_disp_layer *layer, zynqmp_disp_avbuf_set_format(layer->disp, layer, layer->disp_fmt); /* - * Set slave_id for each DMA channel to indicate they're part of a + * Set pconfig for each DMA channel to indicate they're part of a * video group. */ for (i = 0; i < info->num_planes; i++) { struct zynqmp_disp_layer_dma *dma = &layer->dmas[i]; + struct xilinx_dpdma_peripheral_config pconfig = { + .video_group = true, + }; struct dma_slave_config config = { .direction = DMA_MEM_TO_DEV, - .slave_id = 1, + .peripheral_config = &pconfig, + .peripheral_size = sizeof(pconfig), }; dmaengine_slave_config(dma->chan, &config);
diff --git a/include/linux/dma/xilinx_dpdma.h b/include/linux/dma/xilinx_dpdma.h
new file mode 100644
index 000000000000..83a1377f03f8
--- /dev/null
+++ b/include/linux/dma/xilinx_dpdma.h@@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef __LINUX_DMA_XILINX_DPDMA_H +#define __LINUX_DMA_XILINX_DPDMA_H + +#include <linux/types.h> + +struct xilinx_dpdma_peripheral_config { + bool video_group; +}; + +#endif /* __LINUX_DMA_XILINX_DPDMA_H */
--
2.30.2