| From e0b10db4e6d05beb4671a8a4262622e9ac9666a1 Mon Sep 17 00:00:00 2001 |
| From: Maxime Ripard <maxime.ripard@bootlin.com> |
| Date: Mon, 11 Feb 2019 15:41:22 +0100 |
| Subject: 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> |
| --- |
| drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 ++-- |
| 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 7136fc91c6036..e75f77ff8e0fc 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 a07090579f84b..5c3ad5be06901 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; |
| -- |
| 2.20.1 |
| |