Some Allwinner SoCs, such as the A33, have a variation of the TCON that doesn't have a second channel (or it is not wired to anything).
Make sure we can handle that case.
Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com Acked-by: Chen-Yu Tsai wens@csie.org --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 34 +++++++++++++++++++++------------- drivers/gpu/drm/sun4i/sun4i_tcon.h | 2 ++ 2 files changed, 23 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 9180e7e7b551..fde6af1230d2 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -59,11 +59,13 @@ void sun4i_tcon_channel_disable(struct sun4i_tcon *tcon, int channel) regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG, SUN4I_TCON0_CTL_TCON_ENABLE, 0); clk_disable_unprepare(tcon->dclk); - } else if (channel == 1) { - regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, - SUN4I_TCON1_CTL_TCON_ENABLE, 0); - clk_disable_unprepare(tcon->sclk1); + return; } + + WARN_ON(!tcon->has_channel_1); + regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, + SUN4I_TCON1_CTL_TCON_ENABLE, 0); + clk_disable_unprepare(tcon->sclk1); } EXPORT_SYMBOL(sun4i_tcon_channel_disable);
@@ -75,12 +77,14 @@ void sun4i_tcon_channel_enable(struct sun4i_tcon *tcon, int channel) SUN4I_TCON0_CTL_TCON_ENABLE, SUN4I_TCON0_CTL_TCON_ENABLE); clk_prepare_enable(tcon->dclk); - } else if (channel == 1) { - regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, - SUN4I_TCON1_CTL_TCON_ENABLE, - SUN4I_TCON1_CTL_TCON_ENABLE); - clk_prepare_enable(tcon->sclk1); + return; } + + WARN_ON(!tcon->has_channel_1); + regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, + SUN4I_TCON1_CTL_TCON_ENABLE, + SUN4I_TCON1_CTL_TCON_ENABLE); + clk_prepare_enable(tcon->sclk1); } EXPORT_SYMBOL(sun4i_tcon_channel_enable);
@@ -198,6 +202,8 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, u8 clk_delay; u32 val;
+ WARN_ON(!tcon->has_channel_1); + /* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 1); regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG, @@ -321,10 +327,12 @@ static int sun4i_tcon_init_clocks(struct device *dev, return PTR_ERR(tcon->sclk0); }
- tcon->sclk1 = devm_clk_get(dev, "tcon-ch1"); - if (IS_ERR(tcon->sclk1)) { - dev_err(dev, "Couldn't get the TCON channel 1 clock\n"); - return PTR_ERR(tcon->sclk1); + if (tcon->has_channel_1) { + tcon->sclk1 = devm_clk_get(dev, "tcon-ch1"); + if (IS_ERR(tcon->sclk1)) { + dev_err(dev, "Couldn't get the TCON channel 1 clock\n"); + return PTR_ERR(tcon->sclk1); + } }
return sun4i_dclk_create(dev, tcon); diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.h b/drivers/gpu/drm/sun4i/sun4i_tcon.h index 100bfa093277..12bd48925f4d 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.h +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h @@ -164,6 +164,8 @@ struct sun4i_tcon { bool has_mux;
struct drm_panel *panel; + + bool has_channel_1; };
struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node);