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authorJagan Teki <jagan@amarulasolutions.com>2019-12-21 10:54:30 +0300
committerJagan Teki <jagan@amarulasolutions.com>2019-12-27 15:17:26 +0300
commitdbbdc81c6064b4cb7ffc796b71713a19488a2c4c (patch)
tree5a8bba42bdc7677b73ae4565f12a9e7ee454e903
parentcb56caacf8113cef90a3b477f08912260fd6a02e (diff)
downloadu-boot-dbbdc81c6064b4cb7ffc796b71713a19488a2c4c.tar.xz
spi: rk: Limit transfers to (64K - 1) bytes
The Rockchip SPI controller's length register only supports 16-bits, yielding a maximum length of 64KiB (the CTRLR1 register holds "length - 1"). Trying to transfer more than that (e.g., with a large SPI flash read) will cause the driver to hang. Now, it seems that while theoretically we should be able to program CTRLR1 with 0xffff, and get a 64KiB transfer, but that also seems to cause the core to choke, so stick with a maximum of 64K - 1 bytes -- i.e., 0xffff. Note, that the size is further divided into 'minus 1' while writing into CTRLR1. This change fixed two different read issues, 1. sf read failure when with > 0x10000 2. Boot from SPI flash failed during spi_flash_read call in common/spl/spl_spi.c Observed and Tested in - Rockpro64 with Gigadevice flash - ROC-RK3399-PC with Winbond flash Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
-rw-r--r--drivers/spi/rk_spi.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c
index c04535ac44..95eeb8307a 100644
--- a/drivers/spi/rk_spi.c
+++ b/drivers/spi/rk_spi.c
@@ -27,6 +27,12 @@
/* Change to 1 to output registers at the start of each transaction */
#define DEBUG_RK_SPI 0
+/*
+ * ctrlr1 is 16-bits, so we should support lengths of 0xffff + 1. However,
+ * the controller seems to hang when given 0x10000, so stick with this for now.
+ */
+#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff
+
struct rockchip_spi_params {
/* RXFIFO overruns and TXFIFO underruns stop the master clock */
bool master_manages_fifo;
@@ -367,7 +373,7 @@ static inline int rockchip_spi_16bit_reader(struct udevice *dev,
* represented in CTRLR1.
*/
if (data && data->master_manages_fifo)
- max_chunk_size = 0x10000;
+ max_chunk_size = ROCKCHIP_SPI_MAX_TRANLEN;
// rockchip_spi_configure(dev, mode, size)
rkspi_enable_chip(regs, false);
@@ -451,7 +457,7 @@ static int rockchip_spi_xfer(struct udevice *dev, unsigned int bitlen,
/* This is the original 8bit reader/writer code */
while (len > 0) {
- int todo = min(len, 0x10000);
+ int todo = min(len, ROCKCHIP_SPI_MAX_TRANLEN);
rkspi_enable_chip(regs, false);
writel(todo - 1, &regs->ctrlr1);