Re: [PATCH v3 15/56] drm/omap: dsi: request VC via mipi_dsi_attach

Laurent Pinchart
2020-11-09T08:42:15Z

Hi Tomi and Sebastian,

Thank you for the patch.

On Thu, Nov 05, 2020 at 02:02:52PM +0200, Tomi Valkeinen wrote:
> From: Sebastian Reichel <sebastian.reichel@collabora.com>
>
> Drop custom request_vc/release_vc callbacks by using the
> generic mipi_dsi_attach/mipi_dsi_detach functions.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
> .../gpu/drm/omapdrm/displays/panel-dsi-cm.c | 24 +++++---
> drivers/gpu/drm/omapdrm/dss/dsi.c | 61 ++++++++-----------
> drivers/gpu/drm/omapdrm/dss/omapdss.h | 3 -
> 3 files changed, 41 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> index ec36e62ddc3a..b1ca9b34ce17 100644
> --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> @@ -693,14 +693,6 @@ static int dsicm_connect(struct omap_dss_device *src,
> struct omap_dss_device *dst)
> {
> struct panel_drv_data *ddata = to_panel_data(dst);
> - struct device *dev = &ddata->dsi->dev;
> - int r;
> -
> - r = src->ops->dsi.request_vc(src, ddata->channel);
> - if (r) {
> - dev_err(dev, "failed to get virtual channel\n");
> - return r;
> - }
>
> ddata->src = src;
> return 0;
> @@ -711,7 +703,6 @@ static void dsicm_disconnect(struct omap_dss_device *src,
> {
> struct panel_drv_data *ddata = to_panel_data(dst);
>
> - src->ops->dsi.release_vc(src, ddata->channel);
> ddata->src = NULL;
> }
>
> @@ -1276,8 +1267,21 @@ static int dsicm_probe(struct mipi_dsi_device *dsi)
> goto err_bl;
> }
>
> + dsi->lanes = 3;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
> + MIPI_DSI_MODE_EOT_PACKET;
> + dsi->hs_rate = 300000000;
> + dsi->lp_rate = 10000000;

Should this change be explained in the commit message ?

> +
> + r = mipi_dsi_attach(dsi);
> + if (r < 0)
> + goto err_dsi_attach;
> +
> return 0;
>
> +err_dsi_attach:
> + sysfs_remove_group(&dsi->dev.kobj, &dsicm_attr_group);
> err_bl:
> destroy_workqueue(ddata->workqueue);
> err_reg:
> @@ -1294,6 +1298,8 @@ static int __exit dsicm_remove(struct mipi_dsi_device *dsi)
>
> dev_dbg(&dsi->dev, "remove\n");
>
> + mipi_dsi_detach(dsi);
> +
> omapdss_device_unregister(dssdev);
>
> if (omapdss_device_is_enabled(dssdev))
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index d1187a8af37f..a16427f3bc23 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -349,7 +349,7 @@ struct dsi_data {
>
> struct {
> enum dsi_vc_source source;
> - struct omap_dss_device *dssdev;
> + struct mipi_dsi_device *dest;

How about naming this dsidev ?

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> enum fifo_size tx_fifo_size;
> enum fifo_size rx_fifo_size;
> } vc[4];
> @@ -4692,32 +4692,6 @@ static enum omap_channel dsi_get_channel(struct dsi_data *dsi)
> }
> }
>
> -static int dsi_request_vc(struct omap_dss_device *dssdev, int channel)
> -{
> - struct dsi_data *dsi = to_dsi_data(dssdev);
> -
> - if (channel < 0 || channel > 3)
> - return -EINVAL;
> -
> - if (dsi->vc[channel].dssdev) {
> - DSSERR("cannot get VC for display %s", dssdev->name);
> - return -EBUSY;
> - }
> -
> - dsi->vc[channel].dssdev = dssdev;
> - return 0;
> -}
> -
> -static void dsi_release_vc(struct omap_dss_device *dssdev, int channel)
> -{
> - struct dsi_data *dsi = to_dsi_data(dssdev);
> -
> - if ((channel >= 0 && channel <= 3) &&
> - dsi->vc[channel].dssdev == dssdev) {
> - dsi->vc[channel].dssdev = NULL;
> - }
> -}
> -
> static ssize_t omap_dsi_host_transfer(struct mipi_dsi_host *host,
> const struct mipi_dsi_msg *msg)
> {
> @@ -4794,23 +4768,40 @@ static const struct omap_dss_device_ops dsi_ops = {
> .update = dsi_update,
>
> .enable_te = dsi_enable_te,
> -
> - .request_vc = dsi_request_vc,
> - .release_vc = dsi_release_vc,
> },
> };
>
> static int omap_dsi_host_attach(struct mipi_dsi_host *host,
> - struct mipi_dsi_device *dsi)
> + struct mipi_dsi_device *client)
> {
> - /* TODO: convert driver from custom binding method to this one */
> + struct dsi_data *dsi = host_to_omap(host);
> + unsigned int channel = client->channel;
> +
> + if (channel > 3)
> + return -EINVAL;
> +
> + if (dsi->vc[channel].dest) {
> + DSSERR("cannot get VC for display %s", dev_name(&client->dev));
> + return -EBUSY;
> + }
> +
> + dsi->vc[channel].dest = client;
> return 0;
> }
>
> static int omap_dsi_host_detach(struct mipi_dsi_host *host,
> - struct mipi_dsi_device *dsi)
> + struct mipi_dsi_device *client)
> {
> - /* TODO: convert driver from custom binding method to this one */
> + struct dsi_data *dsi = host_to_omap(host);
> + unsigned int channel = client->channel;
> +
> + if (channel > 3)
> + return -EINVAL;
> +
> + if (dsi->vc[channel].dest != client)
> + return -EINVAL;
> +
> + dsi->vc[channel].dest = NULL;
> return 0;
> }
>
> @@ -5269,7 +5260,7 @@ static int dsi_probe(struct platform_device *pdev)
> /* DSI VCs initialization */
> 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].dest = NULL;
> }
>
> r = dsi_get_clocks(dsi);
> diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> index 8cd2c800922e..78041ef922cc 100644
> --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
> +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
> @@ -301,9 +301,6 @@ struct omapdss_dsi_ops {
> int (*enable_video_output)(struct omap_dss_device *dssdev, int channel);
> void (*disable_video_output)(struct omap_dss_device *dssdev,
> int channel);
> -
> - int (*request_vc)(struct omap_dss_device *dssdev, int channel);
> - void (*release_vc)(struct omap_dss_device *dssdev, int channel);
> };
>
> struct omap_dss_device_ops {

--
Regards,

Laurent Pinchart