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[PATCH 0/2] Allwinner V3s DMA support

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  [PATCH 0/2] Allwinner V3s DMA support Icenowy Zheng <icenowy@aosc.io> - 2017-06-05 14:40 +0200
    [PATCH 1/2] dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk Icenowy Zheng <icenowy@aosc.io> - 2017-06-05 15:00 +0200
      Re: [linux-sunxi] [PATCH 1/2] dmaengine: sun6i: make gate bit in  sun8i's DMA engines a common quirk Chen-Yu Tsai <wens@csie.org> - 2017-06-05 15:30 +0200

#1657564 — [PATCH 0/2] Allwinner V3s DMA support

This is a dedicated patchset of Allwinner V3s DMA support, which used
to be part of the audio codec support patchset.

It's a derivation of the DMA part of v3 of the codec patchset.

Icenowy Zheng (2):
  dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk
  dmaengine: sun6i: support V3s SoC variant

 .../devicetree/bindings/dma/sun6i-dma.txt          |  1 +
 drivers/dma/sun6i-dma.c                            | 33 +++++++++++++++++-----
 2 files changed, 27 insertions(+), 7 deletions(-)

-- 
2.12.2

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#1657575 — [PATCH 1/2] dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk

From: Icenowy Zheng <icenowy@aosc.xyz>

Originally we enable a special gate bit when the compatible indicates
A23/33.

But according to BSP sources and user manuals, more SoCs will need this
gate bit.

So make it a common quirk configured in the config struct.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
---
Changes since original codec patchset v3:
- Refactored comments to cover some words found in official documents.
- Removed the comments when toggling the gate bit.

 drivers/dma/sun6i-dma.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index a2358780ab2c..252b59c1d1d5 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -101,6 +101,17 @@ struct sun6i_dma_config {
 	u32 nr_max_channels;
 	u32 nr_max_requests;
 	u32 nr_max_vchans;
+	/*
+	 * In the datasheets/user manuals of newer Allwinner SoCs, a special
+	 * bit (bit 2 at register 0x20) is present.
+	 * It's named "DMA MCLK interface circuit auto gating bit" in the
+	 * documents, and the footnote of this register says that this bit
+	 * should be set up when initializing the DMA controller.
+	 * Allwinner A23/A33 user manuals do not have this bit documented,
+	 * however these SoCs really have and need this bit, as seen in the
+	 * BSP kernel source code.
+	 */
+	bool gate_needed;
 };
 
 /*
@@ -1009,6 +1020,7 @@ static struct sun6i_dma_config sun8i_a23_dma_cfg = {
 	.nr_max_channels = 8,
 	.nr_max_requests = 24,
 	.nr_max_vchans   = 37,
+	.gate_needed	 = true,
 };
 
 static struct sun6i_dma_config sun8i_a83t_dma_cfg = {
@@ -1174,13 +1186,7 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 		goto err_dma_unregister;
 	}
 
-	/*
-	 * sun8i variant requires us to toggle a dma gating register,
-	 * as seen in Allwinner's SDK. This register is not documented
-	 * in the A23 user manual.
-	 */
-	if (of_device_is_compatible(pdev->dev.of_node,
-				    "allwinner,sun8i-a23-dma"))
+	if (sdc->cfg->gate_needed)
 		writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE);
 
 	return 0;
-- 
2.12.2

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#1657595 — Re: [linux-sunxi] [PATCH 1/2] dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk

On Mon, Jun 5, 2017 at 8:33 PM, Icenowy Zheng <icenowy@aosc.io> wrote:
> From: Icenowy Zheng <icenowy@aosc.xyz>
>
> Originally we enable a special gate bit when the compatible indicates
> A23/33.
>
> But according to BSP sources and user manuals, more SoCs will need this
> gate bit.
>
> So make it a common quirk configured in the config struct.
>
> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

Reviewed-by: Chen-Yu Tsai <wens@csie.org>

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