Am Montag, dem 13.06.2022 um 13:36 +0200 schrieb Marek Szyprowski:
On 13.06.2022 13:34, Jagan Teki wrote:
On Mon, Jun 13, 2022 at 5:02 PM Marek Szyprowski m.szyprowski@samsung.com wrote:
On 13.06.2022 13:17, Jagan Teki wrote:
On Wed, May 11, 2022 at 4:01 PM Andrzej Hajda andrzej.hajda@intel.com wrote:
On 04.05.2022 13:40, Jagan Teki wrote:
Fixing up the mode flags is required in order to correlate the correct sync flags of the surrounding components in the chain to make sure the whole pipeline can work properly.
So, handle the mode flags via bridge, atomic_check.
v2:
- none
v1:
- fix mode flags in atomic_check instead of mode_fixup
Signed-off-by: Jagan Teki jagan@amarulasolutions.com
drivers/gpu/drm/bridge/samsung-dsim.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index b618e52d0ee3..bd78cef890e4 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1340,6 +1340,19 @@ static void samsung_dsim_atomic_post_disable(struct drm_bridge *bridge, pm_runtime_put_sync(dsi->dev); }
+static int samsung_dsim_atomic_check(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,struct drm_crtc_state *crtc_state,struct drm_connector_state *conn_state)+{
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;adjusted_mode->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);adjusted_mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
- Shouldn't this be in mode_fixup callback?
Possible to do it on mode_fixup, yes. if we want to do the same stuff on atomic API then atomic_check is the proper helper.
- Where this requirement comes from? As Marek says it breaks Samsung
platforms and is against DSIM specification[1]:
At least the bridge chain starting from LCDIF+DSIM requires active high sync.
Then please make this specific to the imx variant. The current version breaks DSI operation on all Exynos based boards.
But exynos trm also says the same?
"45.2.2.1.2 RGB Interface Vsync, Hsync, and VDEN are active high signals"
Right, but You are forcing the negative sync signals:
adjusted_mode->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
And this is a quirk of the i.MX8MM (and possibly i.MX8MN) SoC integration. The same Samsung DSI IP core on the i.MX8MP does require active high sync signals, matching the documentation.
Regards, Lucas