From: Thierry Reding <treding@xxxxxxxxxx>
Currently the mipi_dsi_dcs_write() function requires the DCS command
byte to be embedded within the write buffer whereas mipi_dsi_dcs_read()
has a separate parameter. Make them more symmetrical by adding an extra
command parameter to mipi_dsi_dcs_write().
Also update the S6E8AA0 panel driver (the only user of this API) to
adapt to this new API.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpu/drm/drm_mipi_dsi.c | 45 ++++++++++++++++++++++++-----------
drivers/gpu/drm/panel/panel-s6e8aa0.c | 4 ++--
include/drm/drm_mipi_dsi.h | 4 ++--
3 files changed, 35 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 6aa6a9e95570..bbab06ef80c9 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -201,29 +201,41 @@ EXPORT_SYMBOL(mipi_dsi_detach);
/**
* mipi_dsi_dcs_write - send DCS write command
* @dsi: DSI device
- * @data: pointer to the command followed by parameters
- * @len: length of @data
+ * @cmd: DCS command
+ * @data: pointer to the command payload
+ * @len: payload length
*/
-ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data,
- size_t len)
+ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
+ const void *data, size_t len)
{
const struct mipi_dsi_host_ops *ops = dsi->host->ops;
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .tx_buf = data,
- .tx_len = len
- };
+ struct mipi_dsi_msg msg;
+ ssize_t err;
+ u8 *tx;
if (!ops || !ops->transfer)
return -ENOSYS;
+ if (len > 0) {
+ tx = kmalloc(1 + len, GFP_KERNEL);
+ if (!tx)
+ return -ENOMEM;
+
+ tx[0] = cmd;
+ memcpy(tx + 1, data, len);
+ } else {
+ tx = &cmd;
+ }
+
+ msg.channel = dsi->channel;
+ msg.tx_len = 1 + len;
+ msg.tx_buf = tx;
+
switch (len) {
case 0:
- return -EINVAL;
- case 1:
msg.type = MIPI_DSI_DCS_SHORT_WRITE;
break;
- case 2:
+ case 1:
msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
break;
default:
@@ -231,14 +243,19 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data,
break;
}
- return ops->transfer(dsi->host, &msg);
+ err = ops->transfer(dsi->host, &msg);
+
+ if (len > 0)
+ kfree(tx);
+
+ return err;
}
EXPORT_SYMBOL(mipi_dsi_dcs_write);
/**
* mipi_dsi_dcs_read - send DCS read request command
* @dsi: DSI device
- * @cmd: DCS read command
+ * @cmd: DCS command
* @data: pointer to read buffer
* @len: length of @data
*
diff --git a/drivers/gpu/drm/panel/panel-s6e8aa0.c b/drivers/gpu/drm/panel/panel-s6e8aa0.c
index 5502ef6bc074..d39bee36816c 100644
--- a/drivers/gpu/drm/panel/panel-s6e8aa0.c
+++ b/drivers/gpu/drm/panel/panel-s6e8aa0.c
@@ -130,7 +130,7 @@ static int s6e8aa0_clear_error(struct s6e8aa0 *ctx)
return ret;
}
-static void s6e8aa0_dcs_write(struct s6e8aa0 *ctx, const void *data, size_t len)
+static void s6e8aa0_dcs_write(struct s6e8aa0 *ctx, const u8 *data, size_t len)
{
struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
ssize_t ret;
@@ -138,7 +138,7 @@ static void s6e8aa0_dcs_write(struct s6e8aa0 *ctx, const void *data, size_t len)
if (ctx->error < 0)
return;
- ret = mipi_dsi_dcs_write(dsi, data, len);
+ ret = mipi_dsi_dcs_write(dsi, data[0], data + 1, len - 1);
if (ret < 0) {
dev_err(ctx->dev, "error %zd writing dcs seq: %*ph\n", ret, len,
data);
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 7b5e1a9244e1..bea181121e8b 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -127,8 +127,8 @@ struct mipi_dsi_device {
int mipi_dsi_attach(struct mipi_dsi_device *dsi);
int mipi_dsi_detach(struct mipi_dsi_device *dsi);
-ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data,
- size_t len);
+ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
+ const void *data, size_t len);
ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
size_t len);
--
2.0.1
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