On Thu, Dec 01, 2016 at 09:29:08PM +0100, Hans de Goede wrote:
> Looking at the ADF code from the Android kernel sources for a
> cherrytrail tablet I noticed that it is calling the
> MIPI_SEQ_ASSERT_RESET sequence from the panel prepare hook.
>
> Until commit b1cb1bd29189 ("drm/i915/dsi: update reset and power sequences
> in panel prepare/unprepare hooks") the mainline i915 code was doing the
> same. That commits effectively swaps the calling of MIPI_SEQ_ASSERT_RESET /
> MIPI_SEQ_DEASSERT_RESET.
>
> Looking at the naming of the sequences that is the right thing to do,
> but the problem is, that the old mainline code and the ADF code was
> actually calling the right sequence (tested on a cube iwork8 air tablet),
> and the swapping of the calling breaks things.
>
> This breakage was likely not noticed in testing because on cherrytrail,
> currently chv_exec_gpio ends up disabling the gpio pins rather then
> setting them (this is fixed in the next patch in this patch-set).
>
> This commit fixes the swapping by fixing MIPI_SEQ_ASSERT/DEASSERT_RESET's
> places in the enum defining them, so that their (new) names match their
> actual use.
>
> Fixes: b1cb1bd29189 ("drm/i915/dsi: update reset and power sequences...")
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_bios.h | 4 ++--
> drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 4 ++--
> 2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
> index 8405b5a..642a5eb 100644
> --- a/drivers/gpu/drm/i915/intel_bios.h
> +++ b/drivers/gpu/drm/i915/intel_bios.h
> @@ -49,11 +49,11 @@ struct edp_power_seq {
> /* MIPI Sequence Block definitions */
> enum mipi_seq {
> MIPI_SEQ_END = 0,
> - MIPI_SEQ_ASSERT_RESET,
> + MIPI_SEQ_DEASSERT_RESET,
> MIPI_SEQ_INIT_OTP,
> MIPI_SEQ_DISPLAY_ON,
> MIPI_SEQ_DISPLAY_OFF,
> - MIPI_SEQ_DEASSERT_RESET,
> + MIPI_SEQ_ASSERT_RESET,
I think we'll still want to keep to the names as they are in the
spec, and instead we'll just call them in the order that looks
wrong + add a comment explaining why we do that.
> MIPI_SEQ_BACKLIGHT_ON, /* sequence block v2+ */
> MIPI_SEQ_BACKLIGHT_OFF, /* sequence block v2+ */
> MIPI_SEQ_TEAR_ON, /* sequence block v2+ */
> diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> index 0d8ff00..579d2f5 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
> @@ -376,11 +376,11 @@ static const fn_mipi_elem_exec exec_elem[] = {
> */
>
> static const char * const seq_name[] = {
> - [MIPI_SEQ_ASSERT_RESET] = "MIPI_SEQ_ASSERT_RESET",
> + [MIPI_SEQ_DEASSERT_RESET] = "MIPI_SEQ_DEASSERT_RESET",
> [MIPI_SEQ_INIT_OTP] = "MIPI_SEQ_INIT_OTP",
> [MIPI_SEQ_DISPLAY_ON] = "MIPI_SEQ_DISPLAY_ON",
> [MIPI_SEQ_DISPLAY_OFF] = "MIPI_SEQ_DISPLAY_OFF",
> - [MIPI_SEQ_DEASSERT_RESET] = "MIPI_SEQ_DEASSERT_RESET",
> + [MIPI_SEQ_ASSERT_RESET] = "MIPI_SEQ_ASSERT_RESET",
> [MIPI_SEQ_BACKLIGHT_ON] = "MIPI_SEQ_BACKLIGHT_ON",
> [MIPI_SEQ_BACKLIGHT_OFF] = "MIPI_SEQ_BACKLIGHT_OFF",
> [MIPI_SEQ_TEAR_ON] = "MIPI_SEQ_TEAR_ON",
> --
> 2.9.3
--
Ville Syrjälä
Intel OTC
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