clk: rs9: Fix suspend/resume

[ Upstream commit 632e04739c8f45c2d9ca4d4c5bd18d80c2ac9296 ]

Disabling the cache in commit 2ff4ba9e3702 ("clk: rs9: Fix I2C accessors")
without removing cache synchronization in resume path results in a
kernel panic as map->cache_ops is unset, due to REGCACHE_NONE.
Enable flat cache again to support resume again. num_reg_defaults_raw
is necessary to read the cache defaults from hardware. Some registers
are strapped in hardware and cannot be provided in software.

Fixes: 2ff4ba9e3702 ("clk: rs9: Fix I2C accessors")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20230310074940.3475703-1-alexander.stein@ew.tq-group.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clk/clk-renesas-pcie.c b/drivers/clk/clk-renesas-pcie.c
index e6247141d0c05029225813d3499347bc449ac4ab..3e98a16eba6bb43e2f89e39e4241ab130572a09a 100644 (file)
--- a/drivers/clk/clk-renesas-pcie.c
+++ b/drivers/clk/clk-renesas-pcie.c
@@ -144,8 +144,9 @@ static int rs9_regmap_i2c_read(void *context,
 static const struct regmap_config rs9_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
-       .cache_type = REGCACHE_NONE,
+       .cache_type = REGCACHE_FLAT,
        .max_register = RS9_REG_BCP,
+       .num_reg_defaults_raw = 0x8,
        .rd_table = &rs9_readable_table,
        .wr_table = &rs9_writeable_table,
        .reg_write = rs9_regmap_i2c_write,