diff options
| author | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-02-11 15:41:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:43:58 -0700 |
| commit | 62431eed2f2514028ba600cb7142da519098d0b8 (patch) | |
| tree | e8312af9601096164567dd5a0676231bf26eca1a | |
| parent | 178fec03ed71f769b75ee90e64ce2f01707780f1 (diff) | |
drm/sun4i: dsi: Restrict DSI tcon clock divider
[ Upstream commit 85fb352666732a9e5caf6027b9c253b3d7881d8f ]
The current code allows the TCON clock divider to have a range between 4
and 127 when feeding the DSI controller.
The only display supported so far had a display clock rate that ended up
using a divider of 4, but testing with other displays show that only 4
seems to be functional.
This also aligns with what Allwinner is doing in their BSP, so let's just
hardcode that we want a divider of 4 when using the DSI output.
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/074e88ae472f5e0492e26939c74b44fb4125ffbd.1549896081.git-series.maxime.ripard@bootlin.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 2 |
2 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 7136fc91c603..e75f77ff8e0f 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -341,8 +341,8 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, u32 block_space, start_delay; u32 tcon_div; - tcon->dclk_min_div = 4; - tcon->dclk_max_div = 127; + tcon->dclk_min_div = SUN6I_DSI_TCON_DIV; + tcon->dclk_max_div = SUN6I_DSI_TCON_DIV; sun4i_tcon0_mode_set_common(tcon, mode); diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h index a07090579f84..5c3ad5be0690 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h @@ -13,6 +13,8 @@ #include <drm/drm_encoder.h> #include <drm/drm_mipi_dsi.h> +#define SUN6I_DSI_TCON_DIV 4 + struct sun6i_dsi { struct drm_connector connector; struct drm_encoder encoder; |