Hi Andrejz, On Thu, Jul 3, 2014 at 5:23 PM, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote: > > Hi Alexandre, > > Thanks for the patch. > > On 07/02/2014 02:19 PM, Alexandre Courbot wrote: >> As per section 5.6.1 of the DSI specification, all DSI transmitters must >> support continuous clock behavior on the clock lane, while non-continuous >> mode support is only optional. Add a flag that allows devices to indicate >> that they require continuous clock mode to operate properly. >> >> Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx> >> --- >> include/drm/drm_mipi_dsi.h | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h >> index 944f33f..5913ef4 100644 >> --- a/include/drm/drm_mipi_dsi.h >> +++ b/include/drm/drm_mipi_dsi.h >> @@ -94,6 +94,8 @@ void mipi_dsi_host_unregister(struct mipi_dsi_host *host); >> #define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8) >> /* disable EoT packets in HS mode */ >> #define MIPI_DSI_MODE_EOT_PACKET BIT(9) >> +/* use continuous clock behavior on the clock lane */ >> +#define MIPI_DSI_MODE_CLOCK_CONTINUOUS BIT(10) >> > > According to MIPI DSI specification "All DSI transmitters and receivers > shall support continuous clock behavior on the Clock Lane, and > optionally may support non-continuous clock behavior". It suggests that > continuous clock should be default behavior. So maybe better is to > introduce sth like: > +#define MIPI_DSI_MODE_CLOCK_NON_CONTINUOUS BIT(10) I started under the assumption that current host drivers assumed non-continuous clock (as the Tegra driver currently does). In that light, it seemed to make sense (and to be less intrusive) to introduce that flag as a restriction rather than a capability. But if you think this should be a capability I am not strongly against it - either way, host drivers need to be changed to take that flag into account. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
