Hi Thierry,
Now I understand what you mean.
I'll implement common DSI helper functions.
Thank you.
Best regards YJ
On 07/21/2014 06:35 PM, Thierry Reding wrote:
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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