From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Sebastian Reichel <sebastian.reichel@collabora.com>
Cc: Sebastian Reichel <sre@kernel.org>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Tony Lindgren <tony@atomide.com>,
Merlijn Wajer <merlijn@wizzup.org>,
"H. Nikolaus Schaller" <hns@goldelico.com>,
Rob Herring <robh@kernel.org>,
linux-omap@vger.kernel.org, dri-devel@lists.freedesktop.org,
kernel@collabora.com
Subject: Re: [PATCHv2 10/56] drm/omap: dsi: drop virtual channel logic
Date: Tue, 25 Feb 2020 17:01:17 +0200 [thread overview]
Message-ID: <20200225150117.GI4764@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20200224232126.3385250-11-sebastian.reichel@collabora.com>
Hi Sebastian,
Thank you for the patch.
On Tue, Feb 25, 2020 at 12:20:40AM +0100, Sebastian Reichel wrote:
> This drops the virtual channel logic. Afterwards DSI clients
> request their channel number and get the virtual channel with
> the same number or -EBUSY if already in use.
I wonder why this level of indirection was used, allocating "virtual
VCs". A single virtual indirection should be enough :-) I may be missing
some context though, I'll defer that to Tomi, but for me,
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
> .../gpu/drm/omapdrm/displays/panel-dsi-cm.c | 11 ++---
> drivers/gpu/drm/omapdrm/dss/dsi.c | 46 ++++---------------
> drivers/gpu/drm/omapdrm/dss/omapdss.h | 4 +-
> 3 files changed, 12 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> index 92f510a771fe..ba046a596044 100644
> --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> @@ -769,19 +769,12 @@ static int dsicm_connect(struct omap_dss_device *src,
> struct device *dev = &ddata->pdev->dev;
> int r;
>
> - r = src->ops->dsi.request_vc(src, &ddata->channel);
> + r = src->ops->dsi.request_vc(src, ddata->channel);
> if (r) {
> dev_err(dev, "failed to get virtual channel\n");
> return r;
> }
>
> - r = src->ops->dsi.set_vc_id(src, ddata->channel, TCH);
> - if (r) {
> - dev_err(dev, "failed to set VC_ID\n");
> - src->ops->dsi.release_vc(src, ddata->channel);
> - return r;
> - }
> -
> ddata->src = src;
> return 0;
> }
> @@ -1216,6 +1209,8 @@ static int dsicm_probe_of(struct platform_device *pdev)
> struct display_timing timing;
> int err;
>
> + ddata->channel = TCH;
> +
> ddata->reset_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
> if (IS_ERR(ddata->reset_gpio)) {
> err = PTR_ERR(ddata->reset_gpio);
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 0990777a42f7..8c223b808740 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -350,7 +350,6 @@ struct dsi_data {
> struct omap_dss_device *dssdev;
> enum fifo_size tx_fifo_size;
> enum fifo_size rx_fifo_size;
> - int vc_id;
> } vc[4];
>
> struct mutex lock;
> @@ -2579,7 +2578,7 @@ static inline void dsi_vc_write_long_header(struct dsi_data *dsi, int channel,
>
> WARN_ON(!dsi_bus_is_locked(dsi));
>
> - data_id = data_type | dsi->vc[channel].vc_id << 6;
> + data_id = data_type | channel << 6;
>
> val = FLD_VAL(data_id, 7, 0) | FLD_VAL(len, 23, 8) |
> FLD_VAL(ecc, 31, 24);
> @@ -2683,7 +2682,7 @@ static int dsi_vc_send_short(struct dsi_data *dsi, int channel, u8 data_type,
> return -EINVAL;
> }
>
> - data_id = data_type | dsi->vc[channel].vc_id << 6;
> + data_id = data_type | channel << 6;
>
> r = (data_id << 0) | (data << 8) | (ecc << 24);
>
> @@ -4783,45 +4782,19 @@ static enum omap_channel dsi_get_channel(struct dsi_data *dsi)
> }
> }
>
> -static int dsi_request_vc(struct omap_dss_device *dssdev, int *channel)
> +static int dsi_request_vc(struct omap_dss_device *dssdev, int channel)
> {
> struct dsi_data *dsi = to_dsi_data(dssdev);
> - int i;
> -
> - for (i = 0; i < ARRAY_SIZE(dsi->vc); i++) {
> - if (!dsi->vc[i].dssdev) {
> - dsi->vc[i].dssdev = dssdev;
> - *channel = i;
> - return 0;
> - }
> - }
>
> - DSSERR("cannot get VC for display %s", dssdev->name);
> - return -ENOSPC;
> -}
> -
> -static int dsi_set_vc_id(struct omap_dss_device *dssdev, int channel, int vc_id)
> -{
> - struct dsi_data *dsi = to_dsi_data(dssdev);
> -
> - if (vc_id < 0 || vc_id > 3) {
> - DSSERR("VC ID out of range\n");
> - return -EINVAL;
> - }
> -
> - if (channel < 0 || channel > 3) {
> - DSSERR("Virtual Channel out of range\n");
> + if (channel < 0 || channel > 3)
> return -EINVAL;
> - }
>
> - if (dsi->vc[channel].dssdev != dssdev) {
> - DSSERR("Virtual Channel not allocated to display %s\n",
> - dssdev->name);
> - return -EINVAL;
> + if (dsi->vc[channel].dssdev) {
> + DSSERR("cannot get VC for display %s", dssdev->name);
> + return -EBUSY;
> }
>
> - dsi->vc[channel].vc_id = vc_id;
> -
> + dsi->vc[channel].dssdev = dssdev;
> return 0;
> }
>
> @@ -4832,7 +4805,6 @@ static void dsi_release_vc(struct omap_dss_device *dssdev, int channel)
> if ((channel >= 0 && channel <= 3) &&
> dsi->vc[channel].dssdev == dssdev) {
> dsi->vc[channel].dssdev = NULL;
> - dsi->vc[channel].vc_id = 0;
> }
> }
>
> @@ -4937,7 +4909,6 @@ static const struct omap_dss_device_ops dsi_ops = {
> .enable_te = dsi_enable_te,
>
> .request_vc = dsi_request_vc,
> - .set_vc_id = dsi_set_vc_id,
> .release_vc = dsi_release_vc,
>
> .transfer = omap_dsi_transfer,
> @@ -5393,7 +5364,6 @@ static int dsi_probe(struct platform_device *pdev)
> for (i = 0; i < ARRAY_SIZE(dsi->vc); i++) {
> dsi->vc[i].source = DSI_VC_SOURCE_L4;
> dsi->vc[i].dssdev = NULL;
> - dsi->vc[i].vc_id = 0;
> }
>
> r = dsi_get_clocks(dsi);
> diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> index 787e102eb068..587206c984a9 100644
> --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
> +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> @@ -301,9 +301,7 @@ struct omapdss_dsi_ops {
> void (*disable_video_output)(struct omap_dss_device *dssdev,
> int channel);
>
> - int (*request_vc)(struct omap_dss_device *dssdev, int *channel);
> - int (*set_vc_id)(struct omap_dss_device *dssdev, int channel,
> - int vc_id);
> + int (*request_vc)(struct omap_dss_device *dssdev, int channel);
> void (*release_vc)(struct omap_dss_device *dssdev, int channel);
>
> /* data transfer */
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2020-02-25 15:01 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 23:20 [PATCHv2 00/56] drm/omap: Convert DSI code to use drm_mipi_dsi and drm_panel Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 01/56] ARM: dts: omap: add channel to DSI panels Sebastian Reichel
2020-02-24 23:38 ` Laurent Pinchart
2020-02-25 0:01 ` Sebastian Reichel
2020-02-27 20:09 ` Sam Ravnborg
2020-02-24 23:20 ` [PATCHv2 02/56] ARM: dts: omap4-droid4: add panel compatible Sebastian Reichel
2020-02-24 23:37 ` Laurent Pinchart
2020-02-24 23:47 ` Tony Lindgren
2020-02-27 22:10 ` Laurent Pinchart
2020-02-28 15:34 ` Tony Lindgren
2020-02-24 23:57 ` Sebastian Reichel
2020-02-27 20:10 ` Sam Ravnborg
2020-02-24 23:20 ` [PATCHv2 03/56] Revert "drm/omap: dss: Remove unused omap_dss_device operations" Sebastian Reichel
2020-03-25 12:42 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 04/56] omap/drm: drop unused dsi.configure_pins Sebastian Reichel
2020-02-24 23:42 ` Laurent Pinchart
2020-02-26 21:28 ` Sebastian Reichel
2020-02-26 21:36 ` Laurent Pinchart
2020-02-26 22:25 ` Sebastian Reichel
2020-03-25 12:45 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 05/56] drm/omap: dsi: use MIPI_DSI_FMT_* instead of OMAP_DSS_DSI_FMT_* Sebastian Reichel
2020-02-25 13:58 ` Laurent Pinchart
2020-02-26 21:25 ` Sebastian Reichel
2020-03-25 12:52 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 06/56] drm/omap: constify write buffers Sebastian Reichel
2020-02-25 14:13 ` Laurent Pinchart
2020-03-25 12:53 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 07/56] drm/omap: dsi: add generic transfer function Sebastian Reichel
2020-02-25 14:16 ` Laurent Pinchart
2020-03-25 13:05 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 08/56] drm/omap: panel-dsi-cm: convert to transfer API Sebastian Reichel
2020-02-25 14:52 ` Laurent Pinchart
2020-02-26 22:12 ` Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 09/56] drm/omap: dsi: unexport specific data transfer functions Sebastian Reichel
2020-02-25 14:53 ` Laurent Pinchart
2020-02-24 23:20 ` [PATCHv2 10/56] drm/omap: dsi: drop virtual channel logic Sebastian Reichel
2020-02-25 15:01 ` Laurent Pinchart [this message]
2020-04-01 11:30 ` Tomi Valkeinen
2020-04-01 11:33 ` Laurent Pinchart
2020-04-01 11:43 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 11/56] drm/omap: dsi: simplify write function Sebastian Reichel
2020-02-25 15:31 ` Laurent Pinchart
2020-02-26 22:46 ` Sebastian Reichel
2020-02-26 22:48 ` Laurent Pinchart
2020-02-24 23:20 ` [PATCHv2 12/56] drm/omap: dsi: simplify read functions Sebastian Reichel
2020-02-25 16:20 ` Laurent Pinchart
2020-02-24 23:20 ` [PATCHv2 13/56] drm/omap: dsi: switch dsi_vc_send_long/short to mipi_dsi_msg Sebastian Reichel
2020-02-25 16:30 ` Laurent Pinchart
2020-02-26 23:34 ` Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 14/56] drm/omap: dsi: introduce mipi_dsi_host Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 15/56] drm/omap: panel-dsi-cm: use DSI helpers Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 16/56] drm/omap: dsi: request VC via mipi_dsi_attach Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 17/56] drm/omap: panel-dsi-cm: drop hardcoded VC Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 18/56] drm/omap: panel-dsi-cm: use common MIPI DCS 1.3 defines Sebastian Reichel
2020-04-01 12:09 ` Tomi Valkeinen
2020-02-24 23:20 ` [PATCHv2 19/56] drm/omap: dsi: drop unused memory_read() Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 20/56] drm/omap: dsi: drop unused get_te() Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 21/56] drm/omap: dsi: drop unused enable_te() Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 22/56] drm/omap: dsi: drop useless sync() Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 23/56] drm/omap: dsi: use pixel-format and mode from attach Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 24/56] drm/omap: panel-dsi-cm: use bulk regulator API Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 25/56] drm/omap: dsi: lp/hs switching support for transfer() Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 26/56] drm/omap: dsi: move TE GPIO handling into core Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 27/56] drm/omap: dsi: drop custom enable_te() API Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 28/56] drm/omap: dsi: do bus locking in host driver Sebastian Reichel
2020-02-24 23:20 ` [PATCHv2 29/56] drm/omap: dsi: untangle ulps ops from enable/disable Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 30/56] drm/dsi: add MIPI_DSI_MODE_ULPS_IDLE Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 31/56] drm/omap: dsi: do ULPS in host driver Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 32/56] drm/omap: dsi: move panel refresh function to host Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 33/56] drm/omap: dsi: Reverse direction of the DSS device enable/disable operations Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 34/56] drm/omap: dsi: drop custom panel capability support Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 35/56] drm/omap: dsi: convert to drm_panel Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 36/56] drm/omap: drop omapdss-boot-init Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 37/56] drm/omap: dsi: implement check timings Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 38/56] drm/omap: panel-dsi-cm: use DEVICE_ATTR_RO Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 39/56] drm/omap: panel-dsi-cm: support unbinding Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 40/56] drm/omap: panel-dsi-cm: fix remove() Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 41/56] drm/omap: dsi: return proper error code from dsi_update_all() Sebastian Reichel
2020-04-01 12:23 ` Tomi Valkeinen
2020-02-24 23:21 ` [PATCHv2 42/56] drm/omap: remove global dss_device variable Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 43/56] drm/omap: bind components with drm_device argument Sebastian Reichel
2020-02-27 0:32 ` Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 44/56] drm/panel: Move OMAP's DSI command mode panel driver Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 45/56] drm/omap: dsi: Register a drm_bridge Sebastian Reichel
2020-02-25 11:50 ` [PATCHv2.1 " Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 46/56] drm/omap: remove legacy DSS device operations Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 47/56] drm/omap: remove unused omap_connector Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 48/56] drm/omap: simplify omap_display_id Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 49/56] drm/omap: drop unused DSS next pointer Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 50/56] drm/omap: drop empty omap_encoder helper functions Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 51/56] drm/omap: drop DSS ops_flags Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 52/56] drm/omap: drop dssdev display field Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 53/56] drm/omap: simplify DSI manual update code Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 54/56] ARM: omap2plus_defconfig: Update for moved DSI command mode panel Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 55/56] drm/panel/panel-dsi-cm: support rotation property Sebastian Reichel
2020-02-24 23:21 ` [PATCHv2 56/56] ARM: dts: omap4-droid4: add panel orientation Sebastian Reichel
2020-02-25 0:10 ` [PATCHv2 00/56] drm/omap: Convert DSI code to use drm_mipi_dsi and drm_panel Tony Lindgren
2020-02-25 2:28 ` Sebastian Reichel
2020-02-25 15:42 ` Tony Lindgren
2020-02-25 23:01 ` Sebastian Reichel
2020-02-25 23:06 ` Laurent Pinchart
2020-02-25 23:09 ` Tony Lindgren
2020-02-25 23:52 ` Sebastian Reichel
2020-02-26 12:20 ` Tomi Valkeinen
2020-02-25 11:53 ` [PATCHv2 57/56] dt-bindings: display: panel-dsi-cm: convert to YAML Sebastian Reichel
2020-02-27 20:35 ` Sam Ravnborg
2020-02-27 22:08 ` Laurent Pinchart
2020-02-26 12:28 ` [PATCHv2 00/56] drm/omap: Convert DSI code to use drm_mipi_dsi and drm_panel Tomi Valkeinen
2020-02-27 0:28 ` Sebastian Reichel
2020-03-25 12:47 ` Tomi Valkeinen
2020-03-25 13:03 ` Laurent Pinchart
2020-04-01 12:43 ` Tomi Valkeinen
2020-06-25 13:07 ` H. Nikolaus Schaller
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=20200225150117.GI4764@pendragon.ideasonboard.com \
--to=laurent.pinchart@ideasonboard.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=hns@goldelico.com \
--cc=kernel@collabora.com \
--cc=linux-omap@vger.kernel.org \
--cc=merlijn@wizzup.org \
--cc=robh@kernel.org \
--cc=sebastian.reichel@collabora.com \
--cc=sre@kernel.org \
--cc=tomi.valkeinen@ti.com \
--cc=tony@atomide.com \
/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).