[PATCH] drm/komeda: Refine function to_d71_input_id

From: james qian wang (Arm Technology China)
Date: Thu May 23 2019 - 22:58:49 EST


Since the component_state->input[i] is only valid when it is active, the
content of input[i] is undefined if it is inactive. The user must check the
state->active_inputs with input index firstly before using state->input[i].
Refine the function to_d71_input_id and directly move such check into it.
Simplify the using and avoid problem that caller forget the valid check.

Depends on:
- https://patchwork.freedesktop.org/series/60856/

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@xxxxxxx>
---
.../arm/display/komeda/d71/d71_component.c | 32 ++++++++++---------
1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
index d101a5cc2766..fff9fc8fab15 100644
--- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
+++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
@@ -156,11 +156,15 @@ static u32 to_ad_ctrl(u64 modifier)
return afbc_ctrl;
}

-static inline u32 to_d71_input_id(struct komeda_component_output *output)
+static inline u32 to_d71_input_id(struct komeda_component_state *st, int idx)
{
- struct komeda_component *comp = output->component;
+ struct komeda_component_output *input = &st->inputs[idx];

- return comp ? (comp->hw_id + output->output_port) : 0;
+ /* if input is not active, set hw input_id(0) to disable it */
+ if (has_bit(idx, st->active_inputs))
+ return input->component->hw_id + input->output_port;
+ else
+ return 0;
}

static void d71_layer_update_fb(struct komeda_component *c,
@@ -388,7 +392,7 @@ static void d71_wb_layer_update(struct komeda_component *c,
ctrl |= LW_TBU_EN;

malidp_write32(reg, BLK_IN_SIZE, HV_SIZE(st->hsize, st->vsize));
- malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(&state->inputs[0]));
+ malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(state, 0));
malidp_write32_mask(reg, BLK_CONTROL, mask, ctrl);
}

@@ -512,15 +516,15 @@ static void d71_compiz_update(struct komeda_component *c,
struct komeda_compiz_state *st = to_compiz_st(state);
u32 __iomem *reg = c->reg;
u32 __iomem *id_reg, *cfg_reg;
- u32 index, input_hw_id;
+ u32 index;

for_each_changed_input(state, index) {
id_reg = reg + index;
cfg_reg = reg + index * CU_PER_INPUT_REGS;
- input_hw_id = to_d71_input_id(&state->inputs[index]);
if (state->active_inputs & BIT(index)) {
compiz_enable_input(id_reg, cfg_reg,
- input_hw_id, &st->cins[index]);
+ to_d71_input_id(state, index),
+ &st->cins[index]);
} else {
malidp_write32(id_reg, BLK_INPUT_ID0, 0);
malidp_write32(cfg_reg, CU_INPUT0_CONTROL, 0);
@@ -696,7 +700,7 @@ static void d71_scaler_update(struct komeda_component *c,
ctrl |= SC_CTRL_LS;

malidp_write32(reg, BLK_CONTROL, ctrl);
- malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(&state->inputs[0]));
+ malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(state, 0));
}

static void d71_scaler_dump(struct komeda_component *c, struct seq_file *sf)
@@ -772,7 +776,7 @@ static void d71_merger_update(struct komeda_component *c,

for_each_changed_input(state, index)
malidp_write32(reg, MG_INPUT_ID0 + index * 4,
- to_d71_input_id(&state->inputs[index]));
+ to_d71_input_id(state, index));

malidp_write32(reg, MG_SIZE, HV_SIZE(st->hsize_merged,
st->vsize_merged));
@@ -839,13 +843,11 @@ static void d71_improc_update(struct komeda_component *c,
{
struct komeda_improc_state *st = to_improc_st(state);
u32 __iomem *reg = c->reg;
- u32 index, input_hw_id;
+ u32 index;

- for_each_changed_input(state, index) {
- input_hw_id = state->active_inputs & BIT(index) ?
- to_d71_input_id(&state->inputs[index]) : 0;
- malidp_write32(reg, BLK_INPUT_ID0 + index * 4, input_hw_id);
- }
+ for_each_changed_input(state, index)
+ malidp_write32(reg, BLK_INPUT_ID0 + index * 4,
+ to_d71_input_id(state, index));

malidp_write32(reg, BLK_SIZE, HV_SIZE(st->hsize, st->vsize));
}
--
2.17.1