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Date: Fri, 24 Sep 2021 05:25:55 +0300 From: Laurent Pinchart <laurent.pinchart@...asonboard.com> To: Rob Clark <robdclark@...il.com> Cc: dri-devel <dri-devel@...ts.freedesktop.org>, freedreno <freedreno@...ts.freedesktop.org>, Douglas Anderson <dianders@...omium.org>, Rob Clark <robdclark@...omium.org>, Andrzej Hajda <a.hajda@...sung.com>, Neil Armstrong <narmstrong@...libre.com>, Robert Foss <robert.foss@...aro.org>, Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 3/3] drm/bridge: ti-sn65dsi86: Add NO_CONNECTOR support Hi Rob, On Thu, Sep 23, 2021 at 10:31:52AM -0700, Rob Clark wrote: > On Wed, Sep 22, 2021 at 5:44 PM Laurent Pinchart wrote: > > On Mon, Sep 20, 2021 at 03:58:00PM -0700, Rob Clark wrote: > > > From: Rob Clark <robdclark@...omium.org> > > > > > > Slightly awkward to fish out the display_info when we aren't creating > > > own connector. But I don't see an obvious better way. > > > > > > v2: Remove error return with NO_CONNECTOR flag > > > > > > Signed-off-by: Rob Clark <robdclark@...omium.org> > > > --- > > > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 39 ++++++++++++++++++++------- > > > 1 file changed, 29 insertions(+), 10 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > > > index 6154bed0af5b..94c94cc8a4d8 100644 > > > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > > > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > > > @@ -667,11 +667,6 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, > > > .node = NULL, > > > }; > > > > > > - if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { > > > - DRM_ERROR("Fix bridge driver to make connector optional!"); > > > - return -EINVAL; > > > - } > > > - > > > pdata->aux.drm_dev = bridge->dev; > > > ret = drm_dp_aux_register(&pdata->aux); > > > if (ret < 0) { > > > @@ -679,9 +674,11 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, > > > return ret; > > > } > > > > > > - ret = ti_sn_bridge_connector_init(pdata); > > > - if (ret < 0) > > > - goto err_conn_init; > > > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { > > > + ret = ti_sn_bridge_connector_init(pdata); > > > + if (ret < 0) > > > + goto err_conn_init; > > > + } > > > > > > /* > > > * TODO: ideally finding host resource and dsi dev registration needs > > > @@ -743,7 +740,8 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, > > > err_dsi_attach: > > > mipi_dsi_device_unregister(dsi); > > > err_dsi_host: > > > - drm_connector_cleanup(&pdata->connector); > > > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) > > > + drm_connector_cleanup(&pdata->connector); > > > > I wonder if we actually need this. The connector gets attached to the > > encoder, won't it be destroyed by the DRM core in the error path ? > > This does not appear to be the case, we leak the connector if I remove > this (and add a hack to trigger the error path) OK. > > > err_conn_init: > > > drm_dp_aux_unregister(&pdata->aux); > > > return ret; > > > @@ -792,9 +790,30 @@ static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata) > > > regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val); > > > } > > > > > > +/* > > > + * Find the connector and fish out the bpc from display_info. It would > > > + * be nice if we could get this instead from drm_bridge_state, but that > > > + * doesn't yet appear to be the case. > > > > You already have a bus format in the bridge state, from which you can > > derive the bpp. Could you give it a try ? > > Possibly the bridge should be converted to ->atomic_enable(), etc.. > I'll leave that for another time It should be fairly straightforward, and would avoid the hack below. > > > + */ > > > static unsigned int ti_sn_bridge_get_bpp(struct ti_sn65dsi86 *pdata) > > > { > > > - if (pdata->connector.display_info.bpc <= 6) > > > + struct drm_bridge *bridge = &pdata->bridge; > > > + struct drm_connector_list_iter conn_iter; > > > + struct drm_connector *connector; > > > + unsigned bpc = 0; > > > + > > > + drm_connector_list_iter_begin(bridge->dev, &conn_iter); > > > + drm_for_each_connector_iter(connector, &conn_iter) { > > > + if (drm_connector_has_possible_encoder(connector, bridge->encoder)) { > > > + bpc = connector->display_info.bpc; > > > + break; > > > + } > > > + } > > > + drm_connector_list_iter_end(&conn_iter); > > > + > > > + WARN_ON(bpc == 0); > > > + > > > + if (bpc <= 6) > > > return 18; > > > else > > > return 24; -- Regards, Laurent Pinchart
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