From: Dave Stevenson <dave.stevenson@raspberrypi.com> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Maxime Ripard <maxime@cerno.tech>, Maxime Ripard <mripard@kernel.org>, Eric Anholt <eric@anholt.net>, Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>, Rob Herring <robh@kernel.org>, Emma Anholt <emma@anholt.net>, dri-devel@lists.freedesktop.org, Joerg Quinten <aBUGSworstnightmare@gmail.com>, Chris Morgan <macromorgan@hotmail.com>, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/7] drm/vc4: dpi: Support RGB565 format Date: Mon, 17 Oct 2022 18:12:44 +0100 [thread overview] Message-ID: <CAPY8ntCVyC7xWtONA4T3x42GYt+t3v+PDbzy3PwE9TfJErUL+A@mail.gmail.com> (raw) In-Reply-To: <Y0rt8FIkRniuv0l4@pendragon.ideasonboard.com> Hi Laurent On Sat, 15 Oct 2022 at 18:29, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > > Hi Maxime and Chris, > > Thank you for the patch. > > On Thu, Oct 13, 2022 at 11:56:48AM +0200, Maxime Ripard wrote: > > From: Chris Morgan <macromorgan@hotmail.com> > > > > The RGB565 format with padding over 24 bits > > (MEDIA_BUS_FMT_RGB565_1X24_CPADHI) is supported by the vc4 DPI > > controller as "mode 3". This is what the Geekworm MZP280 DPI display > > The code below uses DPI_FORMAT_16BIT_565_RGB_2. Is that mode 3, or > should the commit message refer to mode 2 ? It's a mis-mash of documentation from the firmware stack. [1] lists the firmware modes, which start at 1 for the equivalent of DPI_FORMAT_9BIT_666_RGB, so there padded RGB565 is mode 3. I'd advocate dropping the reference to which mode it is: The RGB565 format with padding over 24 bits (MEDIA_BUS_FMT_RGB565_1X24_CPADHI) is supported by the vc4 DPI controller. Dave [1] https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#parallel-display-interface-dpi > With this fixed, > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > > uses, so let's add support for it in the DPI controller driver. > > > > Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com> > > Signed-off-by: Chris Morgan <macromorgan@hotmail.com> > > Signed-off-by: Maxime Ripard <maxime@cerno.tech> > > --- > > drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c > > index 1f8f44b7b5a5..7da3dd1db50e 100644 > > --- a/drivers/gpu/drm/vc4/vc4_dpi.c > > +++ b/drivers/gpu/drm/vc4/vc4_dpi.c > > @@ -182,6 +182,10 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder) > > dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3, > > DPI_FORMAT); > > break; > > + case MEDIA_BUS_FMT_RGB565_1X24_CPADHI: > > + dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_2, > > + DPI_FORMAT); > > + break; > > default: > > DRM_ERROR("Unknown media bus format %d\n", > > bus_format); > > > > -- > Regards, > > Laurent Pinchart
WARNING: multiple messages have this Message-ID (diff)
From: Dave Stevenson <dave.stevenson@raspberrypi.com> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Chris Morgan <macromorgan@hotmail.com>, Emma Anholt <emma@anholt.net>, David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Eric Anholt <eric@anholt.net>, Joerg Quinten <aBUGSworstnightmare@gmail.com>, Maxime Ripard <maxime@cerno.tech> Subject: Re: [PATCH 4/7] drm/vc4: dpi: Support RGB565 format Date: Mon, 17 Oct 2022 18:12:44 +0100 [thread overview] Message-ID: <CAPY8ntCVyC7xWtONA4T3x42GYt+t3v+PDbzy3PwE9TfJErUL+A@mail.gmail.com> (raw) In-Reply-To: <Y0rt8FIkRniuv0l4@pendragon.ideasonboard.com> Hi Laurent On Sat, 15 Oct 2022 at 18:29, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > > Hi Maxime and Chris, > > Thank you for the patch. > > On Thu, Oct 13, 2022 at 11:56:48AM +0200, Maxime Ripard wrote: > > From: Chris Morgan <macromorgan@hotmail.com> > > > > The RGB565 format with padding over 24 bits > > (MEDIA_BUS_FMT_RGB565_1X24_CPADHI) is supported by the vc4 DPI > > controller as "mode 3". This is what the Geekworm MZP280 DPI display > > The code below uses DPI_FORMAT_16BIT_565_RGB_2. Is that mode 3, or > should the commit message refer to mode 2 ? It's a mis-mash of documentation from the firmware stack. [1] lists the firmware modes, which start at 1 for the equivalent of DPI_FORMAT_9BIT_666_RGB, so there padded RGB565 is mode 3. I'd advocate dropping the reference to which mode it is: The RGB565 format with padding over 24 bits (MEDIA_BUS_FMT_RGB565_1X24_CPADHI) is supported by the vc4 DPI controller. Dave [1] https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#parallel-display-interface-dpi > With this fixed, > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > > > uses, so let's add support for it in the DPI controller driver. > > > > Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com> > > Signed-off-by: Chris Morgan <macromorgan@hotmail.com> > > Signed-off-by: Maxime Ripard <maxime@cerno.tech> > > --- > > drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c > > index 1f8f44b7b5a5..7da3dd1db50e 100644 > > --- a/drivers/gpu/drm/vc4/vc4_dpi.c > > +++ b/drivers/gpu/drm/vc4/vc4_dpi.c > > @@ -182,6 +182,10 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder) > > dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3, > > DPI_FORMAT); > > break; > > + case MEDIA_BUS_FMT_RGB565_1X24_CPADHI: > > + dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_2, > > + DPI_FORMAT); > > + break; > > default: > > DRM_ERROR("Unknown media bus format %d\n", > > bus_format); > > > > -- > Regards, > > Laurent Pinchart
next prev parent reply other threads:[~2022-10-17 17:13 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-13 9:56 [PATCH 0/7] drm/vc4: dpi: Various improvements Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-13 9:56 ` [PATCH 1/7] media: uapi: add MEDIA_BUS_FMT_RGB565_1X24_CPADHI Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-13 9:56 ` [PATCH 2/7] media: uapi: add MEDIA_BUS_FMT_BGR666_1X18 Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-15 17:07 ` Laurent Pinchart 2022-10-15 17:07 ` Laurent Pinchart 2022-10-13 9:56 ` [PATCH 3/7] media: uapi: add MEDIA_BUS_FMT_BGR666_1X24_CPADHI Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-13 9:56 ` [PATCH 4/7] drm/vc4: dpi: Support RGB565 format Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-15 17:29 ` Laurent Pinchart 2022-10-15 17:29 ` Laurent Pinchart 2022-10-17 17:12 ` Dave Stevenson [this message] 2022-10-17 17:12 ` Dave Stevenson 2022-10-13 9:56 ` [PATCH 5/7] drm/vc4: dpi: Support BGR666 formats Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-15 17:26 ` Laurent Pinchart 2022-10-15 17:26 ` Laurent Pinchart 2022-10-15 17:30 ` Laurent Pinchart 2022-10-15 17:30 ` Laurent Pinchart 2022-10-17 17:26 ` Dave Stevenson 2022-10-17 17:26 ` Dave Stevenson 2022-10-13 9:56 ` [PATCH 6/7] drm/vc4: dpi: Change the default DPI format to being 18bpp, not 24 Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-15 17:13 ` Laurent Pinchart 2022-10-15 17:13 ` Laurent Pinchart 2022-10-17 17:03 ` Dave Stevenson 2022-10-17 17:03 ` Dave Stevenson 2022-10-13 9:56 ` [PATCH 7/7] drm/vc4: dpi: Fix format mapping for RGB565 Maxime Ripard 2022-10-13 9:56 ` Maxime Ripard 2022-10-15 17:19 ` Laurent Pinchart 2022-10-15 17:19 ` Laurent Pinchart
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=CAPY8ntCVyC7xWtONA4T3x42GYt+t3v+PDbzy3PwE9TfJErUL+A@mail.gmail.com \ --to=dave.stevenson@raspberrypi.com \ --cc=aBUGSworstnightmare@gmail.com \ --cc=airlied@linux.ie \ --cc=daniel@ffwll.ch \ --cc=dri-devel@lists.freedesktop.org \ --cc=emma@anholt.net \ --cc=eric@anholt.net \ --cc=laurent.pinchart@ideasonboard.com \ --cc=linux-kernel@vger.kernel.org \ --cc=macromorgan@hotmail.com \ --cc=maxime@cerno.tech \ --cc=mripard@kernel.org \ --cc=robh@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: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.