There are 2 banks on it6505, and when writing to different bank,
REG_BANK_SEL needs to be set to the targeted bank. The current code set
this additionally, which causes a race condition when a process is
writing bank 0 registers while another process set the bank to 1. Set
ranges in regmap config so the regmap API would handle the bank changes.
Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/ite-it6505.c | 34 +++++++++++++++++++----------
1 file changed, 23 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index bc451b2a77c28..abaf6e23775eb 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -258,12 +258,12 @@
#define REG_AUD_INFOFRAM_SUM 0xFB
/* the following six registers are in bank1 */
-#define REG_DRV_0_DB_800_MV 0x7E
-#define REG_PRE_0_DB_800_MV 0x7F
-#define REG_PRE_3P5_DB_800_MV 0x81
-#define REG_SSC_CTRL0 0x88
-#define REG_SSC_CTRL1 0x89
-#define REG_SSC_CTRL2 0x8A
+#define REG_DRV_0_DB_800_MV 0x17E
+#define REG_PRE_0_DB_800_MV 0x17F
+#define REG_PRE_3P5_DB_800_MV 0x181
+#define REG_SSC_CTRL0 0x188
+#define REG_SSC_CTRL1 0x189
+#define REG_SSC_CTRL2 0x18A
#define RBR DP_LINK_BW_1_62
#define HBR DP_LINK_BW_2_7
@@ -489,7 +489,7 @@ static const struct it6505_audio_sample_rate_map audio_sample_rate_map[] = {
};
static const struct regmap_range it6505_bridge_volatile_ranges[] = {
- { .range_min = 0, .range_max = 0xFF },
+ { .range_min = 0, .range_max = 0x1FF },
};
static const struct regmap_access_table it6505_bridge_volatile_table = {
@@ -497,11 +497,27 @@ static const struct regmap_access_table it6505_bridge_volatile_table = {
.n_yes_ranges = ARRAY_SIZE(it6505_bridge_volatile_ranges),
};
+static const struct regmap_range_cfg it6505_regmap_banks[] = {
+ {
+ .name = "it6505",
+ .range_min = 0x00,
+ .range_max = 0x1FF,
+ .selector_reg = REG_BANK_SEL,
+ .selector_mask = 0x1,
+ .selector_shift = 0,
+ .window_start = 0x00,
+ .window_len = 0x100,
+ },
+};
+
static const struct regmap_config it6505_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_table = &it6505_bridge_volatile_table,
.cache_type = REGCACHE_NONE,
+ .ranges = it6505_regmap_banks,
+ .num_ranges = ARRAY_SIZE(it6505_regmap_banks),
+ .max_register = 0x1FF,
};
static int it6505_read(struct it6505 *it6505, unsigned int reg_addr)
@@ -1267,7 +1283,6 @@ static void it6505_init(struct it6505 *it6505)
it6505_write(it6505, REG_TIME_STMP_CTRL,
EN_SSC_GAT | EN_ENHANCE_VID_STMP | EN_ENHANCE_AUD_STMP);
it6505_write(it6505, REG_INFOFRAME_CTRL, 0x00);
- it6505_write(it6505, REG_BANK_SEL, 0x01);
it6505_write(it6505, REG_DRV_0_DB_800_MV,
afe_setting_table[it6505->afe_setting][0]);
it6505_write(it6505, REG_PRE_0_DB_800_MV,
@@ -1277,7 +1292,6 @@ static void it6505_init(struct it6505 *it6505)
it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
it6505_write(it6505, REG_SSC_CTRL2, 0x42);
- it6505_write(it6505, REG_BANK_SEL, 0x00);
}
static void it6505_video_disable(struct it6505 *it6505)
@@ -1506,11 +1520,9 @@ static void it6505_setup_ssc(struct it6505 *it6505)
it6505_set_bits(it6505, REG_TRAIN_CTRL0, SPREAD_AMP_5,
it6505->enable_ssc ? SPREAD_AMP_5 : 0x00);
if (it6505->enable_ssc) {
- it6505_write(it6505, REG_BANK_SEL, 0x01);
it6505_write(it6505, REG_SSC_CTRL0, 0x9E);
it6505_write(it6505, REG_SSC_CTRL1, 0x1C);
it6505_write(it6505, REG_SSC_CTRL2, 0x42);
- it6505_write(it6505, REG_BANK_SEL, 0x00);
it6505_write(it6505, REG_SP_CTRL0, 0x07);
it6505_write(it6505, REG_IP_CTRL1, 0x29);
it6505_write(it6505, REG_IP_CTRL2, 0x03);
--
2.40.0.348.gf938b09366-goog
