How to output HS clock under Low power mode ?

JH Tsou

Dear all:

How to output HS clock under LP mode ? I find "REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 13, 13); " can always output HS clock regardless LP or HS mode.

But how to toggle HS clock output immediately ?

0 JH Tsou over 12 years ago

Dear all:

omapdss_dsi_vc_enable_hs(dssdev, td->channel, true); //===> will output HS clock and HS Data

REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 13, 13); // ===> always DDR clock output

omapdss_dsi_vc_enable_hs(dssdev, td->channel, false); // ===> Low power mode

I try below:

1. omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);

2. REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 13, 13);

3. omapdss_dsi_vc_enable_hs(dssdev, td->channel, false);

4. taal_sleep_out(td); // ===> exit sleep out

But HS clock stop in step 3.

How to let HS clock always output during step 1~4 ? Anyone knows ?

0 JH Tsou over 12 years ago in reply to JH Tsou

OK. I solved it.

flow:

1. REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 13, 13);

2. omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);

3. send NOP command to trigger HS clock output

4. switch to LP mode : omapdss_dsi_vc_enable_hs(dssdev, td->channel, false);

Thanks.

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