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drm: rcar-du: Fix LVDS start sequence on Gen3 

According to the latest revision of the datasheet, the LVDS I/O pins
must be enabled before starting the PLL. Fix it.

Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Koji Matsuoka 2016-06-28 16:33:45 +09:00 committed by Laurent Pinchart
parent fd1adef3bf
commit 85e8f8d175
1 changed files with 8 additions and 7 deletions
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15
drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
View File

@ -104,7 +104,14 @@ static void rcar_du_lvdsenc_start_gen3(struct rcar_du_lvdsenc *lvds,
rcar_lvds_write(lvds, LVDPLLCR, pllcr);
/* Turn the PLL on, set it to LVDS normal mode, wait for the startup
/* Turn all the channels on. */
rcar_lvds_write(lvds, LVDCR1,
LVDCR1_CHSTBY_GEN3(3) | LVDCR1_CHSTBY_GEN3(2) |
LVDCR1_CHSTBY_GEN3(1) | LVDCR1_CHSTBY_GEN3(0) |
LVDCR1_CLKSTBY_GEN3);
/*
* Turn the PLL on, set it to LVDS normal mode, wait for the startup
* delay and turn the output on.
*/
lvdcr0 = LVDCR0_PLLON;
@ -117,12 +124,6 @@ static void rcar_du_lvdsenc_start_gen3(struct rcar_du_lvdsenc *lvds,
lvdcr0 |= LVDCR0_LVRES;
rcar_lvds_write(lvds, LVDCR0, lvdcr0);
/* Turn all the channels on. */
rcar_lvds_write(lvds, LVDCR1,
LVDCR1_CHSTBY_GEN3(3) | LVDCR1_CHSTBY_GEN3(2) |
LVDCR1_CHSTBY_GEN3(1) | LVDCR1_CHSTBY_GEN3(0) |
LVDCR1_CLKSTBY_GEN3);
}
static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds,