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regmap: Fix for v6.0

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A fix for how we handle controller constraints on SPI message sizes,
 only impacting systems with SPI controllers with very low limits like
 the AMD controller used in the Steam Deck.
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Merge tag 'regmap-fix-v6.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap fix from Mark Brown:
 "A fix for how we handle controller constraints on SPI message sizes,
  only impacting systems with SPI controllers with very low limits like
  the AMD controller used in the Steam Deck"

* tag 'regmap-fix-v6.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: spi: Reserve space for register address/padding
This commit is contained in:
Linus Torvalds 2022-09-08 12:51:58 -04:00
commit b1d27aa3b1
1 changed files with 8 additions and 0 deletions
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8
drivers/base/regmap/regmap-spi.c
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@ -113,6 +113,7 @@ static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
const struct regmap_config *config)
{
size_t max_size = spi_max_transfer_size(spi);
size_t max_msg_size, reg_reserve_size;
struct regmap_bus *bus;
if (max_size != SIZE_MAX) {
@ -120,9 +121,16 @@ static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
if (!bus)
return ERR_PTR(-ENOMEM);
max_msg_size = spi_max_message_size(spi);
reg_reserve_size = config->reg_bits / BITS_PER_BYTE
+ config->pad_bits / BITS_PER_BYTE;
if (max_size + reg_reserve_size > max_msg_size)
max_size -= reg_reserve_size;
bus->free_on_exit = true;
bus->max_raw_read = max_size;
bus->max_raw_write = max_size;
return bus;
}