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drm: rcar-du: dsi: Fix VCLKSET write 

rcar_mipi_dsi_startup() writes correct values to VCLKSET, but as it uses
or-operation to add the new values to the current value in the register,
it should first make sure the fields are cleared.

Do this by using rcar_mipi_dsi_write() to write the VCLKSET register
with a variable that has all the unused bits zeroed.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Tomi Valkeinen 2022-08-24 15:47:26 +03:00 committed by Laurent Pinchart
parent 957fe62d7d
commit 603c8e130d
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
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@ -415,7 +415,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
/* Enable DOT clock */
vclkset = VCLKSET_CKEN;
rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
rcar_mipi_dsi_write(dsi, VCLKSET, vclkset);
if (dsi_format == 24)
vclkset |= VCLKSET_BPP_24;
@ -430,7 +430,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
vclkset |= VCLKSET_COLOR_RGB | VCLKSET_DIV(setup_info.div)
| VCLKSET_LANE(dsi->lanes - 1);
rcar_mipi_dsi_set(dsi, VCLKSET, vclkset);
rcar_mipi_dsi_write(dsi, VCLKSET, vclkset);
/* After setting VCLKSET register, enable VCLKEN */
rcar_mipi_dsi_set(dsi, VCLKEN, VCLKEN_CKEN);