Commit 62431eed authored by Maxime Ripard's avatar Maxime Ripard Committed by Greg Kroah-Hartman

drm/sun4i: dsi: Restrict DSI tcon clock divider

[ Upstream commit 85fb3526 ]

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: default avatarPaul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/074e88ae472f5e0492e26939c74b44fb4125ffbd.1549896081.git-series.maxime.ripard@bootlin.comSigned-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 178fec03
...@@ -341,8 +341,8 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon, ...@@ -341,8 +341,8 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon,
u32 block_space, start_delay; u32 block_space, start_delay;
u32 tcon_div; u32 tcon_div;
tcon->dclk_min_div = 4; tcon->dclk_min_div = SUN6I_DSI_TCON_DIV;
tcon->dclk_max_div = 127; tcon->dclk_max_div = SUN6I_DSI_TCON_DIV;
sun4i_tcon0_mode_set_common(tcon, mode); sun4i_tcon0_mode_set_common(tcon, mode);
......
...@@ -13,6 +13,8 @@ ...@@ -13,6 +13,8 @@
#include <drm/drm_encoder.h> #include <drm/drm_encoder.h>
#include <drm/drm_mipi_dsi.h> #include <drm/drm_mipi_dsi.h>
#define SUN6I_DSI_TCON_DIV 4
struct sun6i_dsi { struct sun6i_dsi {
struct drm_connector connector; struct drm_connector connector;
struct drm_encoder encoder; struct drm_encoder encoder;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment