From: Angus Ainslie <angus@akkea.ca>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: angus.ainslie@puri.sm, Vinod Koul <vkoul@kernel.org>,
dmaengine@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Daniel Baluta <daniel.baluta@gmail.com>
Subject: Re: [PATCH v3 4/5] dma: imx-sdma: add an index for imx8mq multi sdma devices
Date: Wed, 23 Jan 2019 08:42:56 -0700 [thread overview]
Message-ID: <d5f73096cf62ef379e27c11e024c52ff@www.akkea.ca> (raw)
In-Reply-To: <1548257514.28802.3.camel@pengutronix.de>
On 2019-01-23 08:31, Lucas Stach wrote:
> Hi Angus,
>
> Am Mittwoch, den 23.01.2019, 08:23 -0700 schrieb Angus Ainslie
> (Purism):
>> On i.mx8mq, there are two sdma instances, and the common dma framework
>> will get a channel dynamically from any available sdma instance
>> whether
>> it's the first sdma device or the second sdma device. Some IPs like
>> SAI only work with sdma2 not sdma1. To make sure the sdma channel is
>> from
>> the correct sdma device, use an index to match.
>>
>> Based on MLK-16104-2 by Robin Gong <yibin.gong@nxp.com>
>
> This relies on the probe order of the devices (which should be treated
> as random) for the match to find the right device. This is not
> acceptable upstream.
>
> The DT "dmas" property already specifies the correct SDMA device to use
> for a consumer, so the filter function should really match the OF node
> of the SDMA device with the node specified in the dmas phandle in order
> to pick the right SDMA engine.
>
Thanks Lucas, I'll fix it for rev 4
> Regards,
> Lucas
>
>>
>> > Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>
>> ---
>> drivers/dma/imx-sdma.c | 12 ++++++++++++
>> include/linux/platform_data/dma-imx.h | 1 +
>> 2 files changed, 13 insertions(+)
>>
>> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
>> index 2e691b1cd0eb..bf3752a6a64f 100644
>> --- a/drivers/dma/imx-sdma.c
>> +++ b/drivers/dma/imx-sdma.c
>> @@ -442,6 +442,7 @@ struct sdma_engine {
>> > > struct sdma_buffer_descriptor *bd0;
>> > /* clock ratio for AHB:SDMA core. 1:1 is 1, 2:1 is 0*/
>> > > bool clk_ratio;
>> > > + int idx;
>> };
>>
>> static int sdma_config_write(struct dma_chan *chan,
>> @@ -606,6 +607,8 @@ static const struct of_device_id sdma_dt_ids[] = {
>> };
>> MODULE_DEVICE_TABLE(of, sdma_dt_ids);
>>
>> +static int sdma_dev_idx;
>> +
>> > #define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */
>> > #define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */
>> > #define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */
>> @@ -1934,6 +1937,11 @@ static bool sdma_filter_fn(struct dma_chan
>> *chan, void *fn_param)
>> > if (!imx_dma_is_general_purpose(chan))
>> > return false;
>>
>> > + /* return false if it's not the right device */
>> > + if ((sdmac->sdma->drvdata == &sdma_imx8mq)
>> > + && (sdmac->sdma->idx != data->idx))
>> > + return false;
>> +
>> > sdmac->data = *data;
>> > chan->private = &sdmac->data;
>>
>> @@ -1961,6 +1969,7 @@ static struct dma_chan *sdma_xlate(struct
>> of_phandle_args *dma_spec,
>> > * be set to sdmac->event_id1.
>> > */
>> > data.dma_request2 = 0;
>> > + data.idx = sdma->idx;
>>
>> > return dma_request_channel(mask, sdma_filter_fn, &data);
>> }
>> @@ -2149,6 +2158,9 @@ static int sdma_probe(struct platform_device
>> *pdev)
>> > of_node_put(spba_bus);
>> > }
>>
>> > + /* There maybe multi sdma devices such as i.mx8mq */
>> > + sdma->idx = sdma_dev_idx++;
>> +
>> > return 0;
>>
>> err_register:
>> diff --git a/include/linux/platform_data/dma-imx.h
>> b/include/linux/platform_data/dma-imx.h
>> index 7d964e787299..843faf081282 100644
>> --- a/include/linux/platform_data/dma-imx.h
>> +++ b/include/linux/platform_data/dma-imx.h
>> @@ -55,6 +55,7 @@ struct imx_dma_data {
>> > int dma_request2; /* secondary DMA request line */
>> > enum sdma_peripheral_type peripheral_type;
>> > int priority;
>> > + int idx;
>> };
>>
>> static inline int imx_dma_is_ipu(struct dma_chan *chan)
next prev parent reply other threads:[~2019-01-23 15:43 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-20 2:31 [PATCH v2 0/3] dma: imx-sdma: add the sdma engine to the imx8mq Angus Ainslie (Purism)
2019-01-20 2:31 ` [PATCH v2 1/3] dma: imx-sdma: fix NULL pointer de-reference Angus Ainslie (Purism)
2019-01-20 9:54 ` Daniel Baluta
2019-01-20 15:04 ` Angus Ainslie
2019-01-20 2:31 ` [PATCH v2 2/3] dma: imx-sdma: add clock ratio 1:1 check Angus Ainslie (Purism)
2019-01-20 9:58 ` Daniel Baluta
2019-01-20 14:38 ` Angus Ainslie
2019-01-20 18:00 ` Daniel Baluta
2019-01-21 9:17 ` Lucas Stach
2019-01-21 14:43 ` Angus Ainslie
2019-01-20 2:31 ` [PATCH v2 3/3] imx8mq.dtsi: add the sdma nodes Angus Ainslie (Purism)
2019-01-23 15:23 ` [PATCH v3 0/5] dma: imx-sdma: add the sdma engine to the imx8mq Angus Ainslie (Purism)
2019-01-23 15:23 ` [PATCH v3 1/5] dma: imx-sdma: add clock ratio 1:1 check Angus Ainslie (Purism)
2019-01-23 15:43 ` Lucas Stach
2019-01-23 15:23 ` [PATCH v3 2/5] dma: imx-sdma: add imx8mq sdma compatible parts Angus Ainslie (Purism)
2019-01-23 15:23 ` [PATCH v3 3/5] dt-bindings: dma: fsl-imx-sdma: add imx8mq compatible string Angus Ainslie (Purism)
2019-01-23 15:23 ` [PATCH v3 4/5] dma: imx-sdma: add an index for imx8mq multi sdma devices Angus Ainslie (Purism)
2019-01-23 15:31 ` Lucas Stach
2019-01-23 15:42 ` Angus Ainslie [this message]
2019-01-23 15:55 ` Vinod Koul
2019-01-23 15:23 ` [PATCH v3 5/5] imx8mq.dtsi: add the sdma nodes Angus Ainslie (Purism)
2019-01-23 16:50 ` Lucas Stach
2019-01-25 2:55 ` [PATCH v4 0/5] dmaengine: imx-sdma: add the sdma engine to the imx8mq Angus Ainslie (Purism)
2019-01-25 2:55 ` [PATCH v4 1/5] dmaengine: imx-sdma: add clock ratio 1:1 check Angus Ainslie (Purism)
2019-01-25 9:42 ` Lucas Stach
2019-01-25 2:55 ` [PATCH v4 2/5] dmaengine: imx-sdma: add imx8mq sdma compatible parts Angus Ainslie (Purism)
2019-01-25 9:35 ` Lucas Stach
2019-01-25 2:55 ` [PATCH v4 3/5] dt-bindings: dma: fsl-imx-sdma: add fsl,imx8mq to the accepted compatible node Angus Ainslie (Purism)
2019-01-25 9:39 ` Lucas Stach
2019-01-25 2:55 ` [PATCH v4 4/5] dma: imx-sdma: add a test for imx8mq multi sdma devices Angus Ainslie (Purism)
2019-01-25 9:34 ` Lucas Stach
2019-01-25 2:55 ` [PATCH v4 5/5] imx8mq.dtsi: add the sdma nodes Angus Ainslie (Purism)
2019-01-25 9:38 ` Lucas Stach
2019-01-28 6:08 ` [PATCH v5 0/5] dmaengine: imx-sdma: add the sdma engine to the imx8mq Angus Ainslie (Purism)
2019-01-28 6:08 ` [PATCH v5 1/5] dmaengine: imx-sdma: add clock ratio 1:1 check Angus Ainslie (Purism)
2019-01-28 9:29 ` Lucas Stach
2019-01-28 6:08 ` [PATCH v5 2/5] dmaengine: imx-sdma: add imx8mq sdma compatible parts Angus Ainslie (Purism)
2019-01-28 9:32 ` Lucas Stach
2019-01-28 6:08 ` [PATCH v5 3/5] dt-bindings: dma: fsl-imx-sdma: add fsl,imx8mq to the accepted compatible node Angus Ainslie (Purism)
2019-01-28 6:08 ` [PATCH v5 4/5] dmaengine: imx-sdma: add a test for imx8mq multi sdma devices Angus Ainslie (Purism)
2019-01-28 9:33 ` Lucas Stach
2019-01-28 6:08 ` [PATCH v5 5/5] dmaengine: imx-sdma: fix consistent dma test failures Angus Ainslie (Purism)
2019-01-28 16:03 ` [PATCH v6 0/3] dmaengine: imx-sdma: add the sdma engine to the imx8mq Angus Ainslie (Purism)
2019-01-28 16:03 ` [PATCH v6 1/3] dmaengine: imx-sdma: add clock ratio 1:1 check Angus Ainslie (Purism)
2019-01-28 16:03 ` [PATCH v6 2/3] dmaengine: imx-sdma: add a test for imx8mq multi sdma devices Angus Ainslie (Purism)
2019-02-25 13:31 ` Daniel Baluta
2019-01-28 16:03 ` [PATCH v6 3/3] dmaengine: imx-sdma: fix consistent dma test failures Angus Ainslie (Purism)
2019-02-25 17:56 ` [PATCH v6 0/3] dmaengine: imx-sdma: add the sdma engine to the imx8mq Vinod Koul
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