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Date:   Sun, 28 Apr 2019 02:00:13 +0000
From:   Peng Ma <peng.ma@....com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        Leo Li <leoyang.li@....com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH] dmaengine: fsl-qdma: fixed the
 source/destination descriptior format

Hi Vinod,

Thanks your comments.
Please see my comments inline.

Best Regards,
Peng

>-----Original Message-----
>From: Vinod Koul <vkoul@...nel.org>
>Sent: 2019年4月26日 19:51
>To: Peng Ma <peng.ma@....com>
>Cc: dan.j.williams@...el.com; Leo Li <leoyang.li@....com>;
>dmaengine@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: [EXT] Re: [PATCH] dmaengine: fsl-qdma: fixed the source/destination
>descriptior format
>
>Caution: EXT Email
>
>On 19-04-19, 08:46, Peng Ma wrote:
>> CMD of Source/Destination descriptior format should be lower of
>
>s/descriptior/descriptor
>
[Peng Ma] Got it.
>> struct fsl_qdma_engine number data address.
>>
>> Signed-off-by: Peng Ma <peng.ma@....com>
>> ---
>>  drivers/dma/fsl-qdma.c |   29 ++++++++++++++++++-----------
>>  1 files changed, 18 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c index
>> aa1d0ae..542765a 100644
>> --- a/drivers/dma/fsl-qdma.c
>> +++ b/drivers/dma/fsl-qdma.c
>> @@ -113,6 +113,7 @@
>>  /* Field definition for Descriptor offset */
>>  #define QDMA_CCDF_STATUS             20
>>  #define QDMA_CCDF_OFFSET             20
>> +#define QDMA_SDDF_CMD(x)             (((u64)(x)) << 32)
>>
>>  /* Field definition for safe loop count*/
>>  #define FSL_QDMA_HALT_COUNT          1500
>> @@ -214,6 +215,12 @@ struct fsl_qdma_engine {
>>
>>  };
>>
>> +static inline void
>> +qdma_sddf_set_cmd(struct fsl_qdma_format *sddf, u32 val) {
>> +     sddf->data = QDMA_SDDF_CMD(val); }
>> +
>>  static inline u64
>>  qdma_ccdf_addr_get64(const struct fsl_qdma_format *ccdf)  { @@
>-341,6
>> +348,7 @@ static void fsl_qdma_free_chan_resources(struct dma_chan
>> *chan)  static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp
>*fsl_comp,
>>                                     dma_addr_t dst, dma_addr_t
>src,
>> u32 len)  {
>> +     u32 cmd;
>>       struct fsl_qdma_format *sdf, *ddf;
>>       struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
>>
>> @@ -353,6 +361,7 @@ static void fsl_qdma_comp_fill_memcpy(struct
>> fsl_qdma_comp *fsl_comp,
>>
>>       memset(fsl_comp->virt_addr, 0,
>FSL_QDMA_COMMAND_BUFFER_SIZE);
>>       memset(fsl_comp->desc_virt_addr, 0,
>> FSL_QDMA_DESCRIPTOR_BUFFER_SIZE);
>> +
>>       /* Head Command Descriptor(Frame Descriptor) */
>>       qdma_desc_addr_set64(ccdf, fsl_comp->bus_addr + 16);
>>       qdma_ccdf_set_format(ccdf, qdma_ccdf_get_offset(ccdf)); @@
>> -369,14 +378,14 @@ static void fsl_qdma_comp_fill_memcpy(struct
>fsl_qdma_comp *fsl_comp,
>>       /* This entry is the last entry. */
>>       qdma_csgf_set_f(csgf_dest, len);
>>       /* Descriptor Buffer */
>> -     sdf->data =
>> -             cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
>> -                         FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> -     ddf->data =
>> -             cpu_to_le64(FSL_QDMA_CMD_RWTTYPE <<
>> -                         FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> -     ddf->data |=
>> -             cpu_to_le64(FSL_QDMA_CMD_LWC <<
>FSL_QDMA_CMD_LWC_OFFSET);
>> +     cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
>> +                       FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> +     qdma_sddf_set_cmd(sdf, cmd);
>> +
>> +     cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
>> +                       FSL_QDMA_CMD_RWTTYPE_OFFSET);
>> +     cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC <<
>FSL_QDMA_CMD_LWC_OFFSET);
>> +     qdma_sddf_set_cmd(ddf, cmd);
>>  }
>>
>>  /*
>> @@ -701,10 +710,8 @@ static irqreturn_t fsl_qdma_error_handler(int
>> irq, void *dev_id)
>>
>>       intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
>>
>> -     if (intr) {
>> +     if (intr)
>>               dev_err(fsl_qdma->dma_dev.dev, "DMA transaction
>error!\n");
>> -             return IRQ_NONE;
>> -     }
>
>this seems unrelated can you explain?
>
[Peng Ma] This is an added improvement. When an error occurs we should clean the error reg then to return.
I forgot to explain it on comments. Should I add this changed to the comments?
>>
>>       qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status +
>FSL_QDMA_DEDR);
>>       return IRQ_HANDLED;
>> --
>> 1.7.1
>
>--
>~Vinod

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