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drm/dsi: Make mipi_dsi_dcs_{read,write}() symmetrical

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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().

The S6E8AA0 driver relies on the old asymmetric API and there's concern
that moving to the new API may be less efficient. Provide a new function
with the old semantics for those cases and make the S6E8AA0 driver use
it instead.

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2014-07-21 15:47:10 +02:00
parent 9eb491f3ee
commit 960dd616f6
3 changed files with 70 additions and 15 deletions
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2
drivers/gpu/drm/panel/panel-s6e8aa0.c
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@@ -141,7 +141,7 @@ 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_buffer(dsi, data, len);
if (ret < 0) {
dev_err(ctx->dev, "error %zd writing dcs seq: %*ph\n", ret,
(int)len, data);