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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 24, 2021 at 8:18 AM Samuel Holland wrote: > > On 3/23/21 5:53 PM, Laurent Pinchart wrote: > > Hi Jagan, > > > > Thank you for the patch. > > > > On Mon, Mar 22, 2021 at 07:31:49PM +0530, Jagan Teki wrote: > >> Replace of_drm_find_panel with drm_of_find_panel_or_bridge > >> for finding panel, this indeed help to find the bridge if > >> bridge support added. > >> > >> Added NULL in bridge argument, same will replace with bridge > >> parameter once bridge supported. > >> > >> Signed-off-by: Jagan Teki > > > > Looks good, there should be no functional change. > > Actually this breaks all existing users of this driver, see below. > > > Reviewed-by: Laurent Pinchart > > > >> --- > >> Changes for v4, v3: > >> - none > >> > >> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 11 ++++++++--- > >> 1 file changed, 8 insertions(+), 3 deletions(-) > >> > >> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > >> index 4f5efcace68e..2e9e7b2d4145 100644 > >> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > >> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c > >> @@ -21,6 +21,7 @@ > >> > >> #include > >> #include > >> +#include > >> #include > >> #include > >> #include > >> @@ -963,10 +964,14 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host, > >> struct mipi_dsi_device *device) > >> { > >> struct sun6i_dsi *dsi = host_to_sun6i_dsi(host); > >> - struct drm_panel *panel = of_drm_find_panel(device->dev.of_node); > > This is using the OF node of the DSI device, which is a direct child of > the DSI host's OF node. There is no OF graph involved. > > >> + struct drm_panel *panel; > >> + int ret; > >> + > >> + ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 0, 0, > >> + &panel, NULL); > > However, this function expects to find the panel using OF graph. This > does not work with existing device trees (PinePhone, PineTab) which do > not use OF graph to connect the panel. And it cannot work, because the > DSI host's binding specifies a single port: the input port from the > display engine. Thanks for noticing this. I did understand your point and yes, I did mention the updated pipeline in previous versions and forgot to add it to this series. Here is the updated pipeline to make it work: https://patchwork.kernel.org/project/dri-devel/patch/20190524104252.20236-1-jagan@amarulasolutions.com/ Let me know your comments on this, so I will add a patch for the above-affected DTS files. Jagan. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel