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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Vinod Koul <vkoul@kernel.org>, Viresh Kumar <vireshk@kernel.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Serge Semin <fancer.lancer@gmail.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Arnd Bergmann <arnd@arndb.de>, Rob Herring <robh+dt@kernel.org>,
	<linux-mips@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v6 7/9] dmaengine: dw: Add dummy device_caps callback
Date: Thu, 18 Jun 2020 02:40:26 +0300	[thread overview]
Message-ID: <20200617234028.25808-8-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20200617234028.25808-1-Sergey.Semin@baikalelectronics.ru>

Since some DW DMA controllers (like one installed on Baikal-T1 SoC) may
have non-uniform DMA capabilities per device channels, let's add
the DW DMA specific device_caps callback to expose that specifics up to
the DMA consumer. It's a dummy function for now. We'll fill it in with
capabilities overrides in the next commits.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: devicetree@vger.kernel.org

---

Changelog v3:
- This is a new patch created as a result of the discussion with Vinud and
  Andy in the framework of DW DMA burst and LLP capabilities.
---
 drivers/dma/dw/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index fb95920c429e..ceded21537e2 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1049,6 +1049,11 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
 	dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
 }
 
+static void dwc_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
+{
+
+}
+
 int do_dma_probe(struct dw_dma_chip *chip)
 {
 	struct dw_dma *dw = chip->dw;
@@ -1214,6 +1219,7 @@ int do_dma_probe(struct dw_dma_chip *chip)
 	dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
 	dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
 
+	dw->dma.device_caps = dwc_caps;
 	dw->dma.device_config = dwc_config;
 	dw->dma.device_pause = dwc_pause;
 	dw->dma.device_resume = dwc_resume;
-- 
2.26.2


  parent reply	other threads:[~2020-06-17 23:41 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-17 23:40 [PATCH RESEND v6 0/9] dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account Serge Semin
2020-06-17 23:40 ` [PATCH v6 1/9] dt-bindings: dma: dw: Convert DW DMAC to DT binding Serge Semin
2020-06-18  8:21   ` Andy Shevchenko
2020-06-19 17:01     ` Serge Semin
2020-06-17 23:40 ` [PATCH v6 2/9] dt-bindings: dma: dw: Add max burst transaction length property Serge Semin
2020-06-17 23:40 ` [PATCH v6 3/9] dmaengine: Introduce min burst length capability Serge Semin
2020-06-17 23:40 ` [PATCH v6 4/9] dmaengine: Introduce DMA-device device_caps callback Serge Semin
2020-06-17 23:40 ` [PATCH v6 5/9] dmaengine: dw: Take HC_LLP flag into account for noLLP auto-config Serge Semin
2020-06-17 23:40 ` [PATCH v6 6/9] dmaengine: dw: Set DMA device max segment size parameter Serge Semin
2020-06-17 23:40 ` Serge Semin [this message]
2020-06-17 23:40 ` [PATCH v6 8/9] dmaengine: dw: Initialize min and max burst DMA device capability Serge Semin
2020-06-17 23:40 ` [PATCH v6 9/9] dmaengine: dw: Introduce max burst length hw config Serge Semin

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