Most registers are read-writable, but some are only RO or even WO.
regmap does not support using readable_reg and wr_table when outputting
in debugfs, so switch to writeable_reg.
First check for RO or WO registers and fallback tc_readable_reg() for the
leftover RW registers.
Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/tc358767.c | 40 ++++++++++++++++++++-----------
1 file changed, 26 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 1c42c8c6e632e..159c95b26d33c 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -2169,19 +2169,31 @@ static const struct regmap_access_table tc_precious_table = {
.n_yes_ranges = ARRAY_SIZE(tc_precious_ranges),
};
-static const struct regmap_range tc_non_writeable_ranges[] = {
- regmap_reg_range(PPI_BUSYPPI, PPI_BUSYPPI),
- regmap_reg_range(DSI_BUSYDSI, DSI_BUSYDSI),
- regmap_reg_range(DSI_LANESTATUS0, DSI_INTSTATUS),
- regmap_reg_range(TC_IDREG, SYSSTAT),
- regmap_reg_range(GPIOI, GPIOI),
- regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ),
-};
-
-static const struct regmap_access_table tc_writeable_table = {
- .no_ranges = tc_non_writeable_ranges,
- .n_no_ranges = ARRAY_SIZE(tc_non_writeable_ranges),
-};
+static bool tc_writeable_reg(struct device *dev, unsigned int reg)
+{
+ /* RO reg */
+ switch (reg) {
+ case PPI_BUSYPPI:
+ case DSI_BUSYDSI:
+ case DSI_LANESTATUS0:
+ case DSI_LANESTATUS1:
+ case DSI_INTSTATUS:
+ case TC_IDREG:
+ case SYSBOOT:
+ case SYSSTAT:
+ case GPIOI:
+ case DP0_LTSTAT:
+ case DP0_SNKLTCHGREQ:
+ return false;
+ }
+ /* WO reg */
+ switch (reg) {
+ case DSI_STARTDSI:
+ case DSI_INTCLR:
+ return true;
+ }
+ return tc_readable_reg(dev, reg);
+}
static const struct regmap_config tc_regmap_config = {
.name = "tc358767",
@@ -2191,9 +2203,9 @@ static const struct regmap_config tc_regmap_config = {
.max_register = PLL_DBG,
.cache_type = REGCACHE_MAPLE,
.readable_reg = tc_readable_reg,
+ .writeable_reg = tc_writeable_reg,
.volatile_table = &tc_volatile_table,
.precious_table = &tc_precious_table,
- .wr_table = &tc_writeable_table,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
--
2.34.1
