On Fri, Jul 18, 2014 at 10:49:35AM +0900, YoungJun Cho wrote:
> Hi Thierry,
>
> Thank you a lot for kind comments.
>
> On 07/17/2014 07:36 PM, Thierry Reding wrote:
> > On Thu, Jul 17, 2014 at 06:01:25PM +0900, YoungJun Cho wrote:
[...]
> > >diff --git a/drivers/gpu/drm/panel/panel-s6e3fa0.c
> > >b/drivers/gpu/drm/panel/panel-s6e3fa0.c
[...]
> > >+static void s6e3fa0_set_maximum_return_packet_size(struct s6e3fa0 *ctx,
> > >+ unsigned int size)
> > >+{
> > >+ struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> > >+ const struct mipi_dsi_host_ops *ops = dsi->host->ops;
> > >+
> > >+ if (ops && ops->transfer) {
> > >+ unsigned char buf[] = {size, 0};
> > >+ struct mipi_dsi_msg msg = {
> > >+ .channel = dsi->channel,
> > >+ .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
> > >+ .tx_len = sizeof(buf),
> > >+ .tx_buf = buf
> > >+ };
> > >+
> > >+ ops->transfer(dsi->host, &msg);
> > >+ }
> > >+}
> >
> > The Set Maximum Return Packet Size command is a standard command, so
> > please turn that into a generic function exposed by the DSI core.
> >
>
> For this and below standard DCS commands, you want to use generic functions,
> but I have no idea for that.
> Could you explain more detail?
The goal should be to make these standard DCS commands available to all
DSI peripherals, so the implementation should look something like this:
static int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
u16 size)
{
struct mipi_dsi_msg msg;
if (!dsi->ops || !dsi->ops->transfer)
return -ENOSYS;
memset(&msg, 0, sizeof(msg));
msg.channel = dsi->channel;
msg.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE;
msg.tx_len = sizeof(size);
msg.tx_buf = &size;
return dsi->ops->transfer(dsi->host, &msg);
}
The above is somewhat special, since it isn't DCS. For DCS I'd suggest a
common prefix, like so:
enum mipi_dcs_tear_mode {
MIPI_DCS_TEAR_VBLANK,
MIPI_DCS_TEAR_BLANK,
};
static int mipi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
enum mipi_dcs_tear_mode mode)
{
u8 data[2] = { MIPI_DSI_DCS_SET_TEAR_ON, mode };
struct mipi_dsi_msg msg;
if (!dsi->ops || !dsi->ops->transfer)
return -ENOSYS;
memset(&msg, 0, sizeof(msg));
msg.channel = dsi->channel;
msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
msg.tx_len = sizeof(data);
msg.tx_buf = data;
return dsi->ops->transfer(dsi->host, &msg);
}
Thierry
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