drm/dsi: use stack buffer in mipi_dsi_dcs_write()

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Currently the function heap allocates when we have any payload. Where in
many case the payload is 1 byte - ouch.

>From casual observation, vast majority of the payloads are smaller than
8 bytes - so use a stack array tx[8] to avoid the senseless kmalloc and
kfree dance.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200505160329.2976059-1-emil.l.velikov@gmail.com

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Emil Velikov 2020-05-05 17:03:27 +01:00 • committed by Sam Ravnborg

parent 8767c3fc28

commit e192fba23e

1 changed files with 10 additions and 10 deletions

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drivers/gpu/drm/drm_mipi_dsi.c

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