From: Sam Ravnborg <sam@ravnborg.org>
To: Paul Cercueil <paul@crapouillou.net>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org, linux-mips@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
od@zcrc.me
Subject: Re: [PATCH v2 06/10] drm/ingenic: Set DMA descriptor chain address in probe
Date: Tue, 30 Jun 2020 13:44:53 +0200 [thread overview]
Message-ID: <20200630114453.GB560155@ravnborg.org> (raw)
In-Reply-To: <20200629235210.441709-6-paul@crapouillou.net>
Hi Paul.
On Tue, Jun 30, 2020 at 01:52:06AM +0200, Paul Cercueil wrote:
> The address of the DMA descriptor never changes. It can therefore be set
> in the probe function.
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>
> Notes:
> v2: No change
>
> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index 924c8daf071a..f7b0c5dc8cd8 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -358,8 +358,6 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> ingenic_drm_crtc_update_ctrl(priv, finfo);
>
> clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
> -
> - regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc->next);
> }
>
> if (event) {
> @@ -757,6 +755,9 @@ static int ingenic_drm_probe(struct platform_device *pdev)
> }
> }
>
> + /* Set address of our DMA descriptor chain */
> + regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc_phys);
> +
What is the purpose of this code after the assignment was moved:
static int ingenic_drm_probe(struct platform_device *pdev)
{
...
priv->dma_hwdesc->next = priv->dma_hwdesc_phys;
I do not see ->next used anymore.
Could this assignment be dropped?
And the following line:
priv->dma_hwdesc->id = 0xdeafbead;
I can only see ->id be assingned, it is never referenced??
Maybe this is all related to the structure assumed by the data pointed
to by JZ_REG_LCD_DA0?
Sam
> ret = drm_dev_register(drm, 0);
> if (ret) {
> dev_err(dev, "Failed to register DRM driver\n");
> --
> 2.27.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-06-30 11:45 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-29 23:52 [PATCH v2 01/10] dt-bindings: display: Convert ingenic,lcd.txt to YAML Paul Cercueil
2020-06-29 23:52 ` [PATCH v2 02/10] dt-bindings: display: Add ingenic,ipu.yaml Paul Cercueil
2020-06-30 10:08 ` Sam Ravnborg
2020-07-14 2:38 ` Rob Herring
2020-06-29 23:52 ` [PATCH v2 03/10] drm/ingenic: Rename ingenic-drm.c to ingenic-drm-drv.c Paul Cercueil
2020-06-30 10:09 ` Sam Ravnborg
2020-06-29 23:52 ` [PATCH v2 04/10] drm/ingenic: Add missing CR in debug strings Paul Cercueil
2020-06-30 10:10 ` Sam Ravnborg
2020-06-29 23:52 ` [PATCH v2 05/10] drm/ingenic: Fix incorrect assumption about plane->index Paul Cercueil
2020-06-30 11:35 ` Sam Ravnborg
2020-06-29 23:52 ` [PATCH v2 06/10] drm/ingenic: Set DMA descriptor chain address in probe Paul Cercueil
2020-06-30 11:44 ` Sam Ravnborg [this message]
2020-06-30 11:54 ` Paul Cercueil
2020-06-29 23:52 ` [PATCH v2 07/10] drm/ingenic: Move register definitions to ingenic-drm.h Paul Cercueil
2020-06-30 11:46 ` Sam Ravnborg
2020-06-29 23:52 ` [PATCH v2 08/10] drm/ingenic: Add support for OSD mode Paul Cercueil
2020-06-30 12:05 ` Sam Ravnborg
2020-06-30 14:39 ` Paul Cercueil
2020-06-29 23:52 ` [PATCH v2 09/10] drm/ingenic: Add support for the IPU Paul Cercueil
2020-06-30 12:16 ` Sam Ravnborg
2020-06-30 13:33 ` Paul Cercueil
2020-06-29 23:52 ` [PATCH v2 10/10] drm/ingenic: Support multiple panels/bridges Paul Cercueil
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200630114453.GB560155@ravnborg.org \
--to=sam@ravnborg.org \
--cc=airlied@linux.ie \
--cc=daniel@ffwll.ch \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=od@zcrc.me \
--cc=paul@crapouillou.net \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).