On Wed, Feb 23, 2022 at 02:45:30PM +0100, Marek Vasut wrote:
> On 2/23/22 14:41, Maxime Ripard wrote:
> > Hi,
> >
> > On Tue, Feb 22, 2022 at 09:47:23AM +0100, Max Krummenacher wrote:
> > > Use the new property bus-format to set the enum bus_format and bpc.
> > > Completes: commit 4a1d0dbc8332 ("drm/panel: simple: add panel-dpi support")
> > >
> > > Signed-off-by: Max Krummenacher <max.krummenacher@xxxxxxxxxxx>
> > >
> > > ---
> > >
> > > drivers/gpu/drm/panel/panel-simple.c | 32 ++++++++++++++++++++++++++++
> > > 1 file changed, 32 insertions(+)
> > >
> > > Relates to the discussion: https://lore.kernel.org/all/20220201110717.3585-1-cniedermaier@xxxxxxxxxxxxxxxxxx/
> > >
> > > Max
> > >
> > > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > > index c5f133667a2d..5c07260de71c 100644
> > > --- a/drivers/gpu/drm/panel/panel-simple.c
> > > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > > @@ -453,6 +453,7 @@ static int panel_dpi_probe(struct device *dev,
> > > struct panel_desc *desc;
> > > unsigned int bus_flags;
> > > struct videomode vm;
> > > + const char *format = "";
> > > int ret;
> > > np = dev->of_node;
> > > @@ -477,6 +478,37 @@ static int panel_dpi_probe(struct device *dev,
> > > of_property_read_u32(np, "width-mm", &desc->size.width);
> > > of_property_read_u32(np, "height-mm", &desc->size.height);
> > > + of_property_read_string(np, "bus-format", &format);
> > > + if (!strcmp(format, "BGR888_1X24")) {
> > > + desc->bpc = 8;
> > > + desc->bus_format = MEDIA_BUS_FMT_BGR888_1X24;
> > > + } else if (!strcmp(format, "GBR888_1X24")) {
> > > + desc->bpc = 8;
> > > + desc->bus_format = MEDIA_BUS_FMT_GBR888_1X24;
> > > + } else if (!strcmp(format, "RBG888_1X24")) {
> > > + desc->bpc = 8;
> > > + desc->bus_format = MEDIA_BUS_FMT_RBG888_1X24;
> > > + } else if (!strcmp(format, "RGB444_1X12")) {
> > > + desc->bpc = 6;
> > > + desc->bus_format = MEDIA_BUS_FMT_RGB444_1X12;
> > > + } else if (!strcmp(format, "RGB565_1X16")) {
> > > + desc->bpc = 6;
> > > + desc->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
> > > + } else if (!strcmp(format, "RGB666_1X18")) {
> > > + desc->bpc = 6;
> > > + desc->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
> > > + } else if (!strcmp(format, "RGB666_1X24_CPADHI")) {
> > > + desc->bpc = 6;
> > > + desc->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
> > > + } else if (!strcmp(format, "RGB888_1X24")) {
> > > + desc->bpc = 8;
> > > + desc->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
> > > + } else {
> > > + dev_err(dev, "%pOF: missing or unknown bus-format property\n",
> > > + np);
> > > + return -EINVAL;
> > > + }
> > > +
> >
> > It doesn't seem right, really. We can't the bus format / bpc be inferred
> > from the compatible? I'd expect two panels that don't have the same bus
> > format to not be claimed as compatible.
>
> Which compatible ?
>
> Note that this is for panel-dpi compatible, i.e. the panel which has timings
> specified in DT (and needs bus format specified there too).
panel-dpi is supposed to have two compatibles, the panel-specific one
and panel-dpi. This would obviously be tied to the panel-specific one.
Maxime
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