On Tue, 09 May 2017, Madhav Chauhan <madhav.chauhan@xxxxxxxxx> wrote: > As per BSPEC, high/low switch count to be programmed in > terms of byteclock using exit_zero_count and prep_count. > For Geminilake exit/prep counts are already calculated > in terms of byteclock. This patch calculates high/low > switch count using counts value in byteclock, old calculation > leads to screen flicker/shift issue while resuming from S3/S4. > > Signed-off-by: Madhav Chauhan <madhav.chauhan@xxxxxxxxx> Pushed this patch to drm-intel-next-queued, thanks for the patch. BR, Jani. > --- > drivers/gpu/drm/i915/intel_dsi_vbt.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c > index 0dce779..7158c7c 100644 > --- a/drivers/gpu/drm/i915/intel_dsi_vbt.c > +++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c > @@ -694,8 +694,8 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) > clk_zero_cnt << 8 | prepare_cnt; > > /* > - * LP to HS switch count = 4TLPX + PREP_COUNT * 2 + EXIT_ZERO_COUNT * 2 > - * + 10UI + Extra Byte Count > + * LP to HS switch count = 4TLPX + PREP_COUNT * mul + EXIT_ZERO_COUNT * > + * mul + 10UI + Extra Byte Count > * > * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count > * Extra Byte Count is calculated according to number of lanes. > @@ -708,8 +708,8 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id) > /* B044 */ > /* FIXME: > * The comment above does not match with the code */ > - lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * 2 + > - exit_zero_cnt * 2 + 10, 8); > + lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * mul + > + exit_zero_cnt * mul + 10, 8); > > hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8); -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
