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.kocialkow...@bootlin.com> Signed-off-by: Maxime Ripard <maxime.rip...@bootlin.com> --- 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 0420f5c978b9..bee73ead732a 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 dbbc5b3ecbda..6d4a3c0fd9b5 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_dphy { struct clk *bus_clk; struct clk *mod_clk; -- git-series 0.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel