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gpu: ipu-v3: remove IRQ dance on DC channel disable 

This has never worked properly, as the IRQ got retriggered immediately
on unmask. Remove the IRQ wait dance, as it is apparently safe to disable
the DC channel at any point in time.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Lucas Stach 2016-11-08 16:13:25 +01:00 committed by Philipp Zabel
parent 1762ed65c7
commit 2212a780b9
1 changed files with 4 additions and 57 deletions
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61
drivers/gpu/ipu-v3/ipu-dc.c
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@ -112,8 +112,6 @@ struct ipu_dc_priv {
struct ipu_dc channels[IPU_DC_NUM_CHANNELS];
struct mutex mutex;
struct completion comp;
int dc_irq;
int dp_irq;
int use_count;
};
@ -262,47 +260,13 @@ void ipu_dc_enable_channel(struct ipu_dc *dc)
}
EXPORT_SYMBOL_GPL(ipu_dc_enable_channel);
static irqreturn_t dc_irq_handler(int irq, void *dev_id)
{
struct ipu_dc *dc = dev_id;
u32 reg;
reg = readl(dc->base + DC_WR_CH_CONF);
reg &= ~DC_WR_CH_CONF_PROG_TYPE_MASK;
writel(reg, dc->base + DC_WR_CH_CONF);
/* The Freescale BSP kernel clears DIx_COUNTER_RELEASE here */
complete(&dc->priv->comp);
return IRQ_HANDLED;
}
void ipu_dc_disable_channel(struct ipu_dc *dc)
{
struct ipu_dc_priv *priv = dc->priv;
int irq;
unsigned long ret;
u32 val;
/* TODO: Handle MEM_FG_SYNC differently from MEM_BG_SYNC */
if (dc->chno == 1)
irq = priv->dc_irq;
else if (dc->chno == 5)
irq = priv->dp_irq;
else
return;
init_completion(&priv->comp);
enable_irq(irq);
ret = wait_for_completion_timeout(&priv->comp, msecs_to_jiffies(50));
disable_irq(irq);
if (ret == 0) {
dev_warn(priv->dev, "DC stop timeout after 50 ms\n");
val = readl(dc->base + DC_WR_CH_CONF);
val &= ~DC_WR_CH_CONF_PROG_TYPE_MASK;
writel(val, dc->base + DC_WR_CH_CONF);
}
val = readl(dc->base + DC_WR_CH_CONF);
val &= ~DC_WR_CH_CONF_PROG_TYPE_MASK;
writel(val, dc->base + DC_WR_CH_CONF);
}
EXPORT_SYMBOL_GPL(ipu_dc_disable_channel);
@ -389,7 +353,7 @@ int ipu_dc_init(struct ipu_soc *ipu, struct device *dev,
struct ipu_dc_priv *priv;
static int channel_offsets[] = { 0, 0x1c, 0x38, 0x54, 0x58, 0x5c,
0x78, 0, 0x94, 0xb4};
int i, ret;
int i;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@ -410,23 +374,6 @@ int ipu_dc_init(struct ipu_soc *ipu, struct device *dev,
priv->channels[i].base = priv->dc_reg + channel_offsets[i];
}
priv->dc_irq = ipu_map_irq(ipu, IPU_IRQ_DC_FC_1);
if (!priv->dc_irq)
return -EINVAL;
ret = devm_request_irq(dev, priv->dc_irq, dc_irq_handler, 0, NULL,
&priv->channels[1]);
if (ret < 0)
return ret;
disable_irq(priv->dc_irq);
priv->dp_irq = ipu_map_irq(ipu, IPU_IRQ_DP_SF_END);
if (!priv->dp_irq)
return -EINVAL;
ret = devm_request_irq(dev, priv->dp_irq, dc_irq_handler, 0, NULL,
&priv->channels[5]);
if (ret < 0)
return ret;
disable_irq(priv->dp_irq);
writel(DC_WR_CH_CONF_WORD_SIZE_24 | DC_WR_CH_CONF_DISP_ID_PARALLEL(1) |
DC_WR_CH_CONF_PROG_DI_ID,
priv->channels[1].base + DC_WR_CH_CONF);