From: viresh kumar <viresh.linux@gmail.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: viresh kumar <viresh.kumar@st.com>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
Pratyush ANAND <pratyush.anand@st.com>,
Rajeev KUMAR <rajeev-dlh.kumar@st.com>,
Bhupesh SHARMA <bhupesh.sharma@st.com>,
Shiraz HASHIM <shiraz.hashim@st.com>,
"vinod.koul@intel.com" <vinod.koul@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Vipin KUMAR <vipin.kumar@st.com>,
Armando VISCONTI <armando.visconti@st.com>,
Amit VIRDI <Amit.VIRDI@st.com>,
Vipul Kumar SAMAR <vipulkumar.samar@st.com>,
Deepak SIKRI <deepak.sikri@st.com>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 00/18] dmaengine/amba-pl08x updates
Date: Fri, 29 Jul 2011 08:22:40 -0700 [thread overview]
Message-ID: <CAOh2x==-LY1qLnT=gunwbrfVe8zu0rVjHm6mGTXsE+CwE+4+_Q@mail.gmail.com> (raw)
In-Reply-To: <20110729124346.GL25640@n2100.arm.linux.org.uk>
On 7/29/11, Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:
> On Fri, Jul 29, 2011 at 04:53:52PM +0530, viresh kumar wrote:
>> On 07/29/2011 04:49 PM, Russell King - ARM Linux wrote:
>> In my case, JPEG driver doesn't know how much data to transfer. So i have
>> to
>> send zero from there. Also, i am not sure why would peripheral needs to be
>> flow controller if the peripherals driver already know how much to
>> transfer?
>
> If the jpeg driver doesn't know how much data will be transferred, how
> can it allocate a buffer for the device to DMA into?
>
We can specify the upper limit to jpeg after which it stops the
conversion and DMA transfer
inbetween. At this time, we need to start a new DMA transfer with a
separate buffer.
Obviously, for all packets leaving the last, this upper limit is the
size of data transferred before
stopping DMA. But for the last packet we don't how much data will be
there (<= upper limit)
WARNING: multiple messages have this Message-ID (diff)
From: viresh.linux@gmail.com (viresh kumar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 00/18] dmaengine/amba-pl08x updates
Date: Fri, 29 Jul 2011 08:22:40 -0700 [thread overview]
Message-ID: <CAOh2x==-LY1qLnT=gunwbrfVe8zu0rVjHm6mGTXsE+CwE+4+_Q@mail.gmail.com> (raw)
In-Reply-To: <20110729124346.GL25640@n2100.arm.linux.org.uk>
On 7/29/11, Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:
> On Fri, Jul 29, 2011 at 04:53:52PM +0530, viresh kumar wrote:
>> On 07/29/2011 04:49 PM, Russell King - ARM Linux wrote:
>> In my case, JPEG driver doesn't know how much data to transfer. So i have
>> to
>> send zero from there. Also, i am not sure why would peripheral needs to be
>> flow controller if the peripherals driver already know how much to
>> transfer?
>
> If the jpeg driver doesn't know how much data will be transferred, how
> can it allocate a buffer for the device to DMA into?
>
We can specify the upper limit to jpeg after which it stops the
conversion and DMA transfer
inbetween. At this time, we need to start a new DMA transfer with a
separate buffer.
Obviously, for all packets leaving the last, this upper limit is the
size of data transferred before
stopping DMA. But for the last packet we don't how much data will be
there (<= upper limit)
next prev parent reply other threads:[~2011-07-29 15:22 UTC|newest]
Thread overview: 204+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 10:49 [PATCH 00/18] dmaengine/amba-pl08x updates Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 10:49 ` [PATCH 01/18] ARM: asm/pl080.h: Protect against multiple inclusion of header file Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-30 22:16 ` Linus Walleij
2011-07-30 22:16 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 02/18] dmaengine/amba-pl08x: Resolve formatting issues Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 11:00 ` Russell King - ARM Linux
2011-07-29 11:00 ` Russell King - ARM Linux
2011-07-29 11:21 ` viresh kumar
2011-07-29 11:21 ` viresh kumar
2011-07-29 12:05 ` Koul, Vinod
2011-07-29 12:05 ` Koul, Vinod
2011-07-29 15:25 ` viresh kumar
2011-07-29 15:25 ` viresh kumar
2011-07-29 10:49 ` [PATCH 03/18] dmaengine/amba-pl08x: Complete doc comment for struct pl08x_txd Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 10:49 ` [PATCH 04/18] dmaengine/amba-pl08x: Remove redundant comment and rewrite original Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 12:09 ` Koul, Vinod
2011-07-29 12:09 ` Koul, Vinod
2011-07-29 15:47 ` viresh kumar
2011-07-29 15:47 ` viresh kumar
2011-07-29 16:34 ` Russell King - ARM Linux
2011-07-29 16:34 ` Russell King - ARM Linux
2011-07-30 22:32 ` Linus Walleij
2011-07-30 22:32 ` Linus Walleij
2011-07-30 22:57 ` Russell King - ARM Linux
2011-07-30 22:57 ` Russell King - ARM Linux
2011-07-30 23:37 ` Linus Walleij
2011-07-30 23:37 ` Linus Walleij
2011-07-31 5:51 ` viresh kumar
2011-07-31 5:51 ` viresh kumar
2011-07-31 9:06 ` Russell King - ARM Linux
2011-07-31 9:06 ` Russell King - ARM Linux
2011-07-29 10:49 ` [PATCH 05/18] dmaengine/amba-pl08x: Changing few prints to dev_dbg from dev_info Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-30 22:34 ` Linus Walleij
2011-07-30 22:34 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 06/18] dmaengine/amba-pl08x: Simplify pl08x_ensure_on() Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-30 22:36 ` Linus Walleij
2011-07-30 22:36 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 07/18] dmaengine/amba-pl08x: Enable/Disable amba_pclk with channel requests Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-30 12:07 ` Russell King - ARM Linux
2011-07-30 12:07 ` Russell King - ARM Linux
2011-07-30 13:05 ` Russell King - ARM Linux
2011-07-30 13:05 ` Russell King - ARM Linux
2011-07-30 23:53 ` Linus Walleij
2011-07-30 23:53 ` Linus Walleij
2011-07-31 0:04 ` Linus Walleij
2011-07-31 0:04 ` Linus Walleij
2011-07-31 17:04 ` Russell King - ARM Linux
2011-07-31 17:04 ` Russell King - ARM Linux
2011-08-02 9:05 ` Linus Walleij
2011-08-02 9:05 ` Linus Walleij
2011-08-03 12:55 ` Russell King - ARM Linux
2011-08-03 12:55 ` Russell King - ARM Linux
2011-08-09 19:50 ` Linus Walleij
2011-08-09 19:50 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 08/18] dmaengine/amba-pl08x: No need to check "ch->signal < 0" Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-31 0:09 ` Linus Walleij
2011-07-31 0:09 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 09/18] dmaengine/amba-pl08x: Schedule tasklet in case of error interrupt Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 12:16 ` Koul, Vinod
2011-07-29 12:16 ` Koul, Vinod
2011-07-29 13:02 ` Russell King - ARM Linux
2011-07-29 13:02 ` Russell King - ARM Linux
2011-07-29 15:30 ` viresh kumar
2011-07-29 15:30 ` viresh kumar
2011-08-04 4:25 ` Koul, Vinod
2011-08-04 4:25 ` Koul, Vinod
2011-08-04 5:54 ` viresh kumar
2011-08-04 5:54 ` viresh kumar
2011-08-04 5:32 ` Koul, Vinod
2011-08-04 5:32 ` Koul, Vinod
2011-08-14 8:29 ` Russell King - ARM Linux
2011-08-14 8:29 ` Russell King - ARM Linux
2011-07-31 0:19 ` Linus Walleij
2011-07-31 0:19 ` Linus Walleij
2011-07-31 5:33 ` viresh kumar
2011-07-31 5:33 ` viresh kumar
2011-07-29 10:49 ` [PATCH 10/18] dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary() Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 11:05 ` Russell King - ARM Linux
2011-07-29 11:05 ` Russell King - ARM Linux
2011-07-29 12:32 ` Koul, Vinod
2011-07-29 12:32 ` Koul, Vinod
2011-07-29 15:58 ` viresh kumar
2011-07-29 15:58 ` viresh kumar
2011-07-29 12:19 ` Koul, Vinod
2011-07-29 12:19 ` Koul, Vinod
2011-07-29 15:40 ` viresh kumar
2011-07-29 15:40 ` viresh kumar
2011-07-31 0:24 ` Linus Walleij
2011-07-31 0:24 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 11/18] dmaengine/amba-pl08x: max_bytes_per_lli is TRANSFER_SIZE * src_width (not MIN(width)) Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-31 0:27 ` Linus Walleij
2011-07-31 0:27 ` Linus Walleij
2011-07-31 9:09 ` Russell King - ARM Linux
2011-07-31 9:09 ` Russell King - ARM Linux
2011-07-29 10:49 ` [PATCH 12/18] dmaengine/amba-pl08x: Add prep_single_byte_llis() routine Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 11:06 ` Russell King - ARM Linux
2011-07-29 11:06 ` Russell King - ARM Linux
2011-07-29 11:30 ` viresh kumar
2011-07-29 11:30 ` viresh kumar
2011-07-29 10:49 ` [PATCH 13/18] dmaengine/amba-pl08x: Align lli_len to max(src.width, dst.width) Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 12:43 ` Koul, Vinod
2011-07-29 12:43 ` Koul, Vinod
2011-07-29 15:39 ` viresh kumar
2011-07-29 15:39 ` viresh kumar
2011-07-31 0:30 ` Linus Walleij
2011-07-31 0:30 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 14/18] dmaengine/amba-pl08x: Choose peripheral bus as master bus Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-31 0:36 ` Linus Walleij
2011-07-31 0:36 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 15/18] dmaengine/amba-pl08x: Pass flow controller information with slave channel data Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 11:10 ` Russell King - ARM Linux
2011-07-29 11:10 ` Russell King - ARM Linux
2011-07-29 11:31 ` viresh kumar
2011-07-29 11:31 ` viresh kumar
2011-07-31 0:40 ` Linus Walleij
2011-07-31 0:40 ` Linus Walleij
2011-07-31 5:36 ` viresh kumar
2011-07-31 5:36 ` viresh kumar
2011-07-29 10:49 ` [PATCH 16/18] dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-31 0:41 ` Linus Walleij
2011-07-31 0:41 ` Linus Walleij
2011-08-14 8:36 ` Russell King - ARM Linux
2011-08-14 8:36 ` Russell King - ARM Linux
2011-08-15 10:11 ` Linus Walleij
2011-08-15 10:11 ` Linus Walleij
2011-08-18 8:38 ` Viresh Kumar
2011-08-18 8:38 ` Viresh Kumar
2011-08-21 8:33 ` Russell King - ARM Linux
2011-08-21 8:33 ` Russell King - ARM Linux
2011-08-23 4:22 ` Viresh Kumar
2011-08-23 4:22 ` Viresh Kumar
2011-08-23 5:20 ` Koul, Vinod
2011-08-23 5:20 ` Koul, Vinod
2011-08-26 3:41 ` Viresh Kumar
2011-08-26 3:41 ` Viresh Kumar
2011-08-26 8:03 ` Linus Walleij
2011-08-26 8:03 ` Linus Walleij
2011-08-26 8:51 ` Viresh Kumar
2011-08-26 8:51 ` Viresh Kumar
2011-09-01 10:07 ` Viresh Kumar
2011-09-01 10:07 ` Viresh Kumar
2011-09-07 18:42 ` Koul, Vinod
2011-09-07 18:42 ` Koul, Vinod
2011-09-07 23:01 ` Linus Walleij
2011-09-07 23:01 ` Linus Walleij
2011-09-08 3:50 ` Viresh Kumar
2011-09-08 3:50 ` Viresh Kumar
2011-09-08 10:29 ` Linus Walleij
2011-09-08 10:29 ` Linus Walleij
2011-09-08 21:54 ` [PATCH 16/18] dmaengine/ambhe rest oa-pl08x: " Vinod Koul
2011-09-08 21:54 ` Vinod Koul
2011-09-20 6:19 ` Vinod Koul
2011-09-20 6:19 ` Vinod Koul
2011-09-20 6:27 ` Viresh Kumar
2011-09-20 6:27 ` Viresh Kumar
2011-09-20 8:08 ` Vinod Koul
2011-09-20 8:08 ` Vinod Koul
2011-07-29 10:49 ` [PATCH 17/18] dmaengine/amba-pl08x: Check txd->llis_va before freeing dma_pool Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-31 0:44 ` Linus Walleij
2011-07-31 0:44 ` Linus Walleij
2011-07-29 10:49 ` [PATCH 18/18] dmaengine/amba-pl08x: Call pl08x_free_txd() instead of calling kfree() directly Viresh Kumar
2011-07-29 10:49 ` Viresh Kumar
2011-07-29 11:15 ` Russell King - ARM Linux
2011-07-29 11:15 ` Russell King - ARM Linux
2011-07-29 11:38 ` viresh kumar
2011-07-29 11:38 ` viresh kumar
2011-07-31 0:45 ` Linus Walleij
2011-07-31 0:45 ` Linus Walleij
2011-07-31 5:39 ` viresh kumar
2011-07-31 5:39 ` viresh kumar
2011-07-29 10:57 ` [PATCH 00/18] dmaengine/amba-pl08x updates Russell King - ARM Linux
2011-07-29 10:57 ` Russell King - ARM Linux
2011-07-29 11:14 ` viresh kumar
2011-07-29 11:14 ` viresh kumar
2011-07-29 11:19 ` Russell King - ARM Linux
2011-07-29 11:19 ` Russell King - ARM Linux
2011-07-29 11:23 ` viresh kumar
2011-07-29 11:23 ` viresh kumar
2011-07-29 12:43 ` Russell King - ARM Linux
2011-07-29 12:43 ` Russell King - ARM Linux
2011-07-29 15:22 ` viresh kumar [this message]
2011-07-29 15:22 ` viresh kumar
2011-07-29 11:58 ` Koul, Vinod
2011-07-29 11:58 ` Koul, Vinod
2011-08-01 5:30 ` viresh kumar
2011-08-01 5:30 ` viresh kumar
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