diff options
| author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-12-21 14:02:32 +0300 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2018-01-04 22:08:42 +0300 |
| commit | ec08d5966b57abc1e7da4832f0dc57d43eb031b8 (patch) | |
| tree | 914bc667e5208637a879d9750e381f9590a4913d /drivers/gpu/drm/sun4i | |
| parent | edea372bd205a30385d4ffbf51afdac62bba478b (diff) | |
| download | linux-ec08d5966b57abc1e7da4832f0dc57d43eb031b8.tar.xz | |
drm/sun4i: Create minimal multipliers and dividers
The various outputs the TCON can provide have different constraints on the
dotclock divider. Let's make them configurable by the various mode_set
functions.
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/92ff5881c8f8674056d34458b2f264cd48d4e136.1513854122.git-series.maxime.ripard@free-electrons.com
Diffstat (limited to 'drivers/gpu/drm/sun4i')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_dotclock.c | 10 | ||||
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.h | 2 |
3 files changed, 11 insertions, 3 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_dotclock.c b/drivers/gpu/drm/sun4i/sun4i_dotclock.c index d401156490f3..023f39bda633 100644 --- a/drivers/gpu/drm/sun4i/sun4i_dotclock.c +++ b/drivers/gpu/drm/sun4i/sun4i_dotclock.c @@ -17,8 +17,9 @@ #include "sun4i_dotclock.h" struct sun4i_dclk { - struct clk_hw hw; - struct regmap *regmap; + struct clk_hw hw; + struct regmap *regmap; + struct sun4i_tcon *tcon; }; static inline struct sun4i_dclk *hw_to_dclk(struct clk_hw *hw) @@ -73,11 +74,13 @@ static unsigned long sun4i_dclk_recalc_rate(struct clk_hw *hw, static long sun4i_dclk_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { + struct sun4i_dclk *dclk = hw_to_dclk(hw); + struct sun4i_tcon *tcon = dclk->tcon; unsigned long best_parent = 0; u8 best_div = 1; int i; - for (i = 6; i <= 127; i++) { + for (i = tcon->dclk_min_div; i <= tcon->dclk_max_div; i++) { unsigned long ideal = rate * i; unsigned long rounded; @@ -167,6 +170,7 @@ int sun4i_dclk_create(struct device *dev, struct sun4i_tcon *tcon) dclk = devm_kzalloc(dev, sizeof(*dclk), GFP_KERNEL); if (!dclk) return -ENOMEM; + dclk->tcon = tcon; init.name = clk_name; init.ops = &sun4i_dclk_ops; diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index a1ed462c2430..41d325c0420f 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -177,6 +177,8 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon, u8 clk_delay; u32 val = 0; + tcon->dclk_min_div = 6; + tcon->dclk_max_div = 127; sun4i_tcon0_mode_set_common(tcon, mode); /* Adjust clock delay */ diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h index 839266a38505..bd3ad7684870 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h @@ -169,6 +169,8 @@ struct sun4i_tcon { /* Pixel clock */ struct clk *dclk; + u8 dclk_max_div; + u8 dclk_min_div; /* Reset control */ struct reset_control *lcd_rst; |