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SubjectRe: [PATCH 3/3] drm/panel: add panel driver for Xinpeng XPP055C272 panels
Date
Hi Sam,

thanks for the thorough review :-)

Am Samstag, 14. Dezember 2019, 09:17:30 CET schrieb Sam Ravnborg:
> > +#define dsi_generic_write_seq(dsi, cmd, seq...) do { \
> > + static const u8 d[] = { seq }; \
> > + int ret; \
> > + ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d)); \
> > + if (ret < 0) \
> > + return ret; \
> > + } while (0)
> This macro return an error code if a write fails.
>
> > +
> > +static int xpp055c272_init_sequence(struct xpp055c272 *ctx)
> > +{
> > + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> > + struct device *dev = ctx->dev;
> > + int ret;
> > +
> > + /*
> > + * Init sequence was supplied by the panel vendor without much
> > + * documentation.
> > + */
> > + dsi_generic_write_seq(dsi, XPP055C272_CMD_SETEXTC, 0xf1, 0x12, 0x83);
> But all uses of the macro here ignore the error.

hmm, am I way off track here?

dsi_generic_write_seq(dsi, XPP055C272_CMD_SETEXTC, 0xf1, 0x12, 0x83);
dsi_generic_write_seq(dsi, XPP055C272_CMD_SETMIPI,
0x33, 0x81, 0x05, 0xf9, 0x0e, 0x0e, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4f, 0x01,
0x00, 0x00, 0x37);
...

should just expand to

do {
static const u8 d[] = { 0xf1, 0x12, 0x83 };
int ret;
ret = mipi_dsi_dcs_write(dsi, XPP055C272_CMD_SETEXTC, d, ARRAY_SIZE(d));
if (ret < 0)
return ret;
} while (0)
do {
static const u8 d[] = { 0x33, 0x81, 0x05, 0xf9, 0x0e, 0x0e, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4f, 0x01,
0x00, 0x00, 0x37 };
int ret;
ret = mipi_dsi_dcs_write(dsi, XPP055C272_CMD_SETMIPI, d, ARRAY_SIZE(d));
if (ret < 0)
return ret;
} while (0)
...

so every write instance will actually return an error if it happens and not
continue on with the next init item.

Or I'm not thinking correctly at 0:07 ;-)


Heiko


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