From e81582c080ddec3359bc6726291e62a1ba8b7350 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 15 Apr 2024 22:31:19 +0300 Subject: [PATCH 1/2] spi: Extract spi_toggle_csgpiod() helper for better maintanance The multi-CS support splits the comment and the code in the spi_set_cs(). To avoid this in the future extract spi_toggle_csgpiod() helper. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240415193340.1279360-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown --- drivers/spi/spi.c | 49 ++++++++++++++++++++++++----------------------- 1 file changed, 25 insertions(+), 24 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index a2f01116ba09..63abe4320ab4 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1036,6 +1036,29 @@ static inline bool spi_is_last_cs(struct spi_device *spi) return last; } +static void spi_toggle_csgpiod(struct spi_device *spi, u8 idx, bool enable, bool activate) +{ + /* + * Historically ACPI has no means of the GPIO polarity and + * thus the SPISerialBus() resource defines it on the per-chip + * basis. In order to avoid a chain of negations, the GPIO + * polarity is considered being Active High. Even for the cases + * when _DSD() is involved (in the updated versions of ACPI) + * the GPIO CS polarity must be defined Active High to avoid + * ambiguity. That's why we use enable, that takes SPI_CS_HIGH + * into account. + */ + if (has_acpi_companion(&spi->dev)) + gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), !enable); + else + /* Polarity handled by GPIO library */ + gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), activate); + + if (activate) + spi_delay_exec(&spi->cs_setup, NULL); + else + spi_delay_exec(&spi->cs_inactive, NULL); +} static void spi_set_cs(struct spi_device *spi, bool enable, bool force) { @@ -1072,31 +1095,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force) if (spi_is_csgpiod(spi)) { if (!(spi->mode & SPI_NO_CS)) { - /* - * Historically ACPI has no means of the GPIO polarity and - * thus the SPISerialBus() resource defines it on the per-chip - * basis. In order to avoid a chain of negations, the GPIO - * polarity is considered being Active High. Even for the cases - * when _DSD() is involved (in the updated versions of ACPI) - * the GPIO CS polarity must be defined Active High to avoid - * ambiguity. That's why we use enable, that takes SPI_CS_HIGH - * into account. - */ for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) { - if ((spi->cs_index_mask & BIT(idx)) && spi_get_csgpiod(spi, idx)) { - if (has_acpi_companion(&spi->dev)) - gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), - !enable); - else - /* Polarity handled by GPIO library */ - gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx), - activate); - - if (activate) - spi_delay_exec(&spi->cs_setup, NULL); - else - spi_delay_exec(&spi->cs_inactive, NULL); - } + if ((spi->cs_index_mask & BIT(idx)) && spi_get_csgpiod(spi, idx)) + spi_toggle_csgpiod(spi, idx, enable, activate); } } /* Some SPI masters need both GPIO CS & slave_select */ From d707530b1ea518e23c7aa7b50ee79231f2964da0 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 15 Apr 2024 22:31:20 +0300 Subject: [PATCH 2/2] spi: Introduce spi_for_each_valid_cs() in order of deduplication In order of deduplication and better maintenance introduce a new spi_for_each_valid_cs() helper macro. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240415193340.1279360-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown --- drivers/spi/spi.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 63abe4320ab4..b5b24d91bd50 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1022,16 +1022,18 @@ static void spi_res_release(struct spi_controller *ctlr, struct spi_message *mes } /*-------------------------------------------------------------------------*/ +#define spi_for_each_valid_cs(spi, idx) \ + for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) \ + if (!(spi->cs_index_mask & BIT(idx))) {} else + static inline bool spi_is_last_cs(struct spi_device *spi) { u8 idx; bool last = false; - for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) { - if (spi->cs_index_mask & BIT(idx)) { - if (spi->controller->last_cs[idx] == spi_get_chipselect(spi, idx)) - last = true; - } + spi_for_each_valid_cs(spi, idx) { + if (spi->controller->last_cs[idx] == spi_get_chipselect(spi, idx)) + last = true; } return last; } @@ -1095,8 +1097,8 @@ static void spi_set_cs(struct spi_device *spi, bool enable, bool force) if (spi_is_csgpiod(spi)) { if (!(spi->mode & SPI_NO_CS)) { - for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) { - if ((spi->cs_index_mask & BIT(idx)) && spi_get_csgpiod(spi, idx)) + spi_for_each_valid_cs(spi, idx) { + if (spi_get_csgpiod(spi, idx)) spi_toggle_csgpiod(spi, idx, enable, activate); } }