mtd: gpmi: allocate a proper buffer for non ECC read/write

The @data_buffer_dma buffer is used for non ECC read/write.

Currently, the length of the buffer is PAGE_SIZE, but the NAND chip may
has 8K page or 16K page. So we have to extend it for the large page NAND
chips.

The gpmi_alloc_dma_buffer will be called twice. The first time is to
allocate a temporary buffer for scanning the NAND chip; The second time
is to allocate a buffer to store the real page content.

This patch allocates a buffer of PAGE_SIZE size for scanning the NAND
chip when gpmi_alloc_dma_buffer is called the first time, and allocates a
buffer of the real NAND page size for the second time gpmi_alloc_dma_buffer
is called.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index e2f58207c779..d1d13d86b7e0 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -783,14 +783,23 @@ static int gpmi_alloc_dma_buffer(struct gpmi_nand_data *this)
 {
         struct bch_geometry *geo = &this->bch_geometry;
         struct device *dev = this->dev;
+        struct mtd_info *mtd = &this->mtd;
 
         /* [1] Allocate a command buffer. PAGE_SIZE is enough. */
         this->cmd_buffer = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
         if (this->cmd_buffer == NULL)
                 goto error_alloc;
 
-        /* [2] Allocate a read/write data buffer. PAGE_SIZE is enough. */
-        this->data_buffer_dma = kzalloc(PAGE_SIZE, GFP_DMA | GFP_KERNEL);
+        /*
+         * [2] Allocate a read/write data buffer.
+         *     The gpmi_alloc_dma_buffer can be called twice.
+         *     We allocate a PAGE_SIZE length buffer if gpmi_alloc_dma_buffer
+         *     is called before the nand_scan_ident; and we allocate a buffer
+         *     of the real NAND page size when the gpmi_alloc_dma_buffer is
+         *     called after the nand_scan_ident.
+         */
+        this->data_buffer_dma = kzalloc(mtd->writesize ?: PAGE_SIZE,
+                                        GFP_DMA | GFP_KERNEL);
         if (this->data_buffer_dma == NULL)
                 goto error_alloc;