drm/msm/dsi: add support for dsi test pattern generator

During board bringups its useful to have a DSI test pattern
generator to isolate a DPU vs a DSI issue and focus on the relevant
hardware block.

To facilitate this, add an API which triggers the DSI controller
test pattern. The expected output is a rectangular checkered pattern.

This has been validated on a single DSI video mode panel by calling it
right after drm_panel_enable() which is also the ideal location to use
this as the DSI host and the panel have been initialized by then.

Further validation on dual DSI and command mode panel is pending.
If there are any fix ups needed for those, it shall be applied on top
of this change.

Changes in v2:
 - generate the new dsi.xml.h and update the bitfield names

Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Link: https://lore.kernel.org/r/1626922232-29105-2-git-send-email-abhinavk@codeaurora.org
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index f790a234e99f..6643e4c0692c 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -440,6 +440,19 @@ phy_en_fail:
 	return;
 }
 
+void msm_dsi_manager_tpg_enable(void)
+{
+	struct msm_dsi *m_dsi = dsi_mgr_get_dsi(DSI_0);
+	struct msm_dsi *s_dsi = dsi_mgr_get_dsi(DSI_1);
+
+	/* if dual dsi, trigger tpg on master first then slave */
+	if (m_dsi) {
+		msm_dsi_host_test_pattern_en(m_dsi->host);
+		if (IS_DUAL_DSI() && s_dsi)
+			msm_dsi_host_test_pattern_en(s_dsi->host);
+	}
+}
+
 static void dsi_mgr_bridge_enable(struct drm_bridge *bridge)
 {
 	int id = dsi_mgr_bridge_get_id(bridge);