From: Ned Forrester Date: Sat, 13 Sep 2008 09:33:17 +0000 (-0700) Subject: pxa2xx_spi: chipselect bugfixes X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8423597d676615f3dd2d9ab36f59f147086b90b8;p=linux-2.6 pxa2xx_spi: chipselect bugfixes Fixes several chipselect bugs in the pxa2xx_spi driver. These bugs are in all versions of this driver and prevent using it with chips like m25p16 flash. 1. The spi_transfer.cs_change flag is handled too early: before spi_transfer.delay_usecs applies, thus making the delay ineffective at holding chip select. 2. spi_transfer.delay_usecs is ignored on the last transfer of a message (likewise not holding chipselect long enough). 3. If spi_transfer.cs_change is set on the last transfer, the chip select is always disabled, instead of the intended meaning: optionally holding chip select enabled for the next message. Those first three bugs were fixed with a relocation of delays and chip select de-assertions. 4. If a message has the cs_change flag set on the last transfer, and had the chip select stayed enabled as requested (see 3, above), it would not have been disabled if the next message is for a different chip. Fixed by dropping chip select regardless of cs_change at end of a message, if there is no next message or if the next message is for a different chip. This patch should apply to all kernels back to and including 2.6.20; it was test patched against 2.6.20. An additional patch would be required for older kernels, but those versions are very buggy anyway. Signed-off-by: Ned Forrester Cc: Vernon Sauder Cc: Eric Miao Signed-off-by: David Brownell Cc: [2.6.25.x, 2.6.26.x] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c index 34c7c98756..a7b9070e1b 100644 --- a/drivers/spi/pxa2xx_spi.c +++ b/drivers/spi/pxa2xx_spi.c @@ -144,7 +144,6 @@ struct driver_data { size_t tx_map_len; u8 n_bytes; u32 dma_width; - int cs_change; int (*write)(struct driver_data *drv_data); int (*read)(struct driver_data *drv_data); irqreturn_t (*transfer_handler)(struct driver_data *drv_data); @@ -406,8 +405,45 @@ static void giveback(struct driver_data *drv_data) struct spi_transfer, transfer_list); + /* Delay if requested before any change in chip select */ + if (last_transfer->delay_usecs) + udelay(last_transfer->delay_usecs); + + /* Drop chip select UNLESS cs_change is true or we are returning + * a message with an error, or next message is for another chip + */ if (!last_transfer->cs_change) drv_data->cs_control(PXA2XX_CS_DEASSERT); + else { + struct spi_message *next_msg; + + /* Holding of cs was hinted, but we need to make sure + * the next message is for the same chip. Don't waste + * time with the following tests unless this was hinted. + * + * We cannot postpone this until pump_messages, because + * after calling msg->complete (below) the driver that + * sent the current message could be unloaded, which + * could invalidate the cs_control() callback... + */ + + /* get a pointer to the next message, if any */ + spin_lock_irqsave(&drv_data->lock, flags); + if (list_empty(&drv_data->queue)) + next_msg = NULL; + else + next_msg = list_entry(drv_data->queue.next, + struct spi_message, queue); + spin_unlock_irqrestore(&drv_data->lock, flags); + + /* see if the next and current messages point + * to the same chip + */ + if (next_msg && next_msg->spi != msg->spi) + next_msg = NULL; + if (!next_msg || msg->state == ERROR_STATE) + drv_data->cs_control(PXA2XX_CS_DEASSERT); + } msg->state = NULL; if (msg->complete) @@ -490,10 +526,9 @@ static void dma_transfer_complete(struct driver_data *drv_data) msg->actual_length += drv_data->len - (drv_data->rx_end - drv_data->rx); - /* Release chip select if requested, transfer delays are - * handled in pump_transfers */ - if (drv_data->cs_change) - drv_data->cs_control(PXA2XX_CS_DEASSERT); + /* Transfer delays and chip select release are + * handled in pump_transfers or giveback + */ /* Move to next transfer */ msg->state = next_transfer(drv_data); @@ -602,10 +637,9 @@ static void int_transfer_complete(struct driver_data *drv_data) drv_data->cur_msg->actual_length += drv_data->len - (drv_data->rx_end - drv_data->rx); - /* Release chip select if requested, transfer delays are - * handled in pump_transfers */ - if (drv_data->cs_change) - drv_data->cs_control(PXA2XX_CS_DEASSERT); + /* Transfer delays and chip select release are + * handled in pump_transfers or giveback + */ /* Move to next transfer */ drv_data->cur_msg->state = next_transfer(drv_data); @@ -840,13 +874,17 @@ static void pump_transfers(unsigned long data) return; } - /* Delay if requested at end of transfer*/ + /* Delay if requested at end of transfer before CS change */ if (message->state == RUNNING_STATE) { previous = list_entry(transfer->transfer_list.prev, struct spi_transfer, transfer_list); if (previous->delay_usecs) udelay(previous->delay_usecs); + + /* Drop chip select only if cs_change is requested */ + if (previous->cs_change) + drv_data->cs_control(PXA2XX_CS_DEASSERT); } /* Check transfer length */ @@ -878,7 +916,6 @@ static void pump_transfers(unsigned long data) drv_data->len = transfer->len & DCMD_LENGTH; drv_data->write = drv_data->tx ? chip->write : null_writer; drv_data->read = drv_data->rx ? chip->read : null_reader; - drv_data->cs_change = transfer->cs_change; /* Change speed and bit per word on a per transfer */ cr0 = chip->cr0;