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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 Hi Jagan, On Wed, Mar 24, 2021 at 02:44:57PM +0530, Jagan Teki wrote: > On Wed, Mar 24, 2021 at 8:18 AM Samuel Holland wrote: > > On 3/23/21 5:53 PM, Laurent Pinchart wrote: > > > 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. DT is an ABI, we need to ensure backward compatibility. Changes in kernel drivers can't break devices that have an old DT. -- Regards, Laurent Pinchart _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel