The R-Car V4H Reference Manual R19UH0186EJ0121 Rev.1.21 section
67.2.2.3 Tx Set Register (TXSETR), field LANECNT description
indicates that the TXSETR register LANECNT bitfield lane count
must be configured such, that it matches lane count configuration
in PPISETR register DLEN bitfield. Make sure the LANECNT and DLEN
bitfields are configured to match.
Signed-off-by: Marek Vasut <marek.vasut+rene...@mailbox.org>
---
Cc: David Airlie <airl...@gmail.com>
Cc: Geert Uytterhoeven <geert+rene...@glider.be>
Cc: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
Cc: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Magnus Damm <magnus.d...@gmail.com>
Cc: Maxime Ripard <mrip...@kernel.org>
Cc: Simona Vetter <sim...@ffwll.ch>
Cc: Thomas Zimmermann <tzimmerm...@suse.de>
Cc: Tomi Valkeinen <tomi.valkeinen+rene...@ideasonboard.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-renesas-...@vger.kernel.org
---
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 3 +++
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h | 4 ++++
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
index 373bd0040a46..c31e0d8f3ff9 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
@@ -576,6 +576,9 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
udelay(10);
rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_UPDATEPLL);
+ rcar_mipi_dsi_clr(dsi, TXSETR, TXSETR_LANECNT_MASK);
+ rcar_mipi_dsi_set(dsi, TXSETR, dsi->lanes - 1);
+
ppisetr = ((BIT(dsi->lanes) - 1) & PPISETR_DLEN_MASK) | PPISETR_CLEN;
rcar_mipi_dsi_write(dsi, PPISETR, ppisetr);
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
index cefa7e92b5b8..b018037e116d 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
@@ -12,6 +12,10 @@
#define LINKSR_LPBUSY BIT(1)
#define LINKSR_HSBUSY BIT(0)
+#define TXSETR 0x100
+#define TXSETR_EOTPEN BIT(12)
+#define TXSETR_LANECNT_MASK (0x3 << 0)
+
/*
* Video Mode Register
*/
--
2.47.2
