From 2a2b16210bbc8c5881286d2ff742f3bdf1a7fd9c Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Tue, 7 Feb 2017 12:01:46 +0100 Subject: brcm63xx: backport upstream solution for SPI message size limits Backport upstream solution for working around SPI controller maximum message sizes. Signed-off-by: Jonas Gorski --- ...spi-nor-change-return-value-of-read-write.patch | 149 +++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch (limited to 'target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch') diff --git a/target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch b/target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch new file mode 100644 index 0000000000..31c24e51a1 --- /dev/null +++ b/target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch @@ -0,0 +1,149 @@ +From 59451e1233bd315c5379a631838a03d80e689581 Mon Sep 17 00:00:00 2001 +From: Michal Suchanek +Date: Thu, 5 May 2016 17:31:47 -0700 +Subject: [PATCH 01/10] mtd: spi-nor: change return value of read/write + +Change the return value of spi-nor device read and write methods to +allow returning amount of data transferred and errors as +read(2)/write(2) does. + +Also, start handling positive returns in spi_nor_read(), since we want +to convert drivers to start returning the read-length both via *retlen +and the return code. (We don't need to do the same transition process +for spi_nor_write(), since ->write() didn't used to have a return code +at all.) + +Signed-off-by: Michal Suchanek +Signed-off-by: Brian Norris +Tested-by Cyrille Pitchen +Acked-by: Michal Suchanek +Tested-by: Michal Suchanek +--- + drivers/mtd/devices/m25p80.c | 5 +++-- + drivers/mtd/spi-nor/fsl-quadspi.c | 5 +++-- + drivers/mtd/spi-nor/nxp-spifi.c | 12 ++++++------ + drivers/mtd/spi-nor/spi-nor.c | 5 ++++- + include/linux/mtd/spi-nor.h | 4 ++-- + 6 files changed, 36 insertions(+), 21 deletions(-) + +--- a/drivers/mtd/devices/m25p80.c ++++ b/drivers/mtd/devices/m25p80.c +@@ -73,7 +73,7 @@ static int m25p80_write_reg(struct spi_n + return spi_write(spi, flash->command, len + 1); + } + +-static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len, ++static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len, + size_t *retlen, const u_char *buf) + { + struct m25p *flash = nor->priv; +@@ -101,6 +101,7 @@ static void m25p80_write(struct spi_nor + spi_sync(spi, &m); + + *retlen += m.actual_length - cmd_sz; ++ return 0; + } + + static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor) +@@ -119,7 +120,7 @@ static inline unsigned int m25p80_rx_nbi + * Read an address range from the nor chip. The address range + * may be any size provided it is within the physical boundaries. + */ +-static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len, ++static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len, + size_t *retlen, u_char *buf) + { + struct m25p *flash = nor->priv; +--- a/drivers/mtd/spi-nor/fsl-quadspi.c ++++ b/drivers/mtd/spi-nor/fsl-quadspi.c +@@ -822,7 +822,7 @@ static int fsl_qspi_write_reg(struct spi + return ret; + } + +-static void fsl_qspi_write(struct spi_nor *nor, loff_t to, ++static ssize_t fsl_qspi_write(struct spi_nor *nor, loff_t to, + size_t len, size_t *retlen, const u_char *buf) + { + struct fsl_qspi *q = nor->priv; +@@ -832,9 +832,10 @@ static void fsl_qspi_write(struct spi_no + + /* invalid the data in the AHB buffer. */ + fsl_qspi_invalid(q); ++ return 0; + } + +-static int fsl_qspi_read(struct spi_nor *nor, loff_t from, ++static ssize_t fsl_qspi_read(struct spi_nor *nor, loff_t from, + size_t len, size_t *retlen, u_char *buf) + { + struct fsl_qspi *q = nor->priv; +--- a/drivers/mtd/spi-nor/nxp-spifi.c ++++ b/drivers/mtd/spi-nor/nxp-spifi.c +@@ -172,8 +172,8 @@ static int nxp_spifi_write_reg(struct sp + return nxp_spifi_wait_for_cmd(spifi); + } + +-static int nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len, +- size_t *retlen, u_char *buf) ++static ssize_t nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len, ++ size_t *retlen, u_char *buf) + { + struct nxp_spifi *spifi = nor->priv; + int ret; +@@ -188,8 +188,8 @@ static int nxp_spifi_read(struct spi_nor + return 0; + } + +-static void nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len, +- size_t *retlen, const u_char *buf) ++static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len, ++ size_t *retlen, const u_char *buf) + { + struct nxp_spifi *spifi = nor->priv; + u32 cmd; +@@ -197,7 +197,7 @@ static void nxp_spifi_write(struct spi_n + + ret = nxp_spifi_set_memory_mode_off(spifi); + if (ret) +- return; ++ return ret; + + writel(to, spifi->io_base + SPIFI_ADDR); + *retlen += len; +@@ -212,7 +212,7 @@ static void nxp_spifi_write(struct spi_n + while (len--) + writeb(*buf++, spifi->io_base + SPIFI_DATA); + +- nxp_spifi_wait_for_cmd(spifi); ++ return nxp_spifi_wait_for_cmd(spifi); + } + + static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs) +--- a/drivers/mtd/spi-nor/spi-nor.c ++++ b/drivers/mtd/spi-nor/spi-nor.c +@@ -893,7 +893,10 @@ static int spi_nor_read(struct mtd_info + ret = nor->read(nor, from, len, retlen, buf); + + spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ); +- return ret; ++ if (ret < 0) ++ return ret; ++ ++ return 0; + } + + static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, +--- a/include/linux/mtd/spi-nor.h ++++ b/include/linux/mtd/spi-nor.h +@@ -169,9 +169,9 @@ struct spi_nor { + int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len); + int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len); + +- int (*read)(struct spi_nor *nor, loff_t from, ++ ssize_t (*read)(struct spi_nor *nor, loff_t from, + size_t len, size_t *retlen, u_char *read_buf); +- void (*write)(struct spi_nor *nor, loff_t to, ++ ssize_t (*write)(struct spi_nor *nor, loff_t to, + size_t len, size_t *retlen, const u_char *write_buf); + int (*erase)(struct spi_nor *nor, loff_t offs); + -- cgit v1.2.3