All platforms since Snapdragon 8 Gen1 (SM8450) require using 4-byte
reads to access QFPROM data. While older platforms were more than happy
with 1-byte reads, change the qfprom driver to use 4-byte reads for all
the platforms. Specify stride and word size of 4 bytes. To retain
compatibility with the existing DT and to simplify porting data from
vendor kernels, use fixup_dt_cell_info in order to bump alignment
requirements.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
drivers/nvmem/qfprom.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
index 116a39e804c70b4a0374f8ea3ac6ba1dd612109d..a872c640b8c5a558da9ea00e3804c904f8987247 100644
--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -321,19 +321,32 @@ static int qfprom_reg_read(void *context,
unsigned int reg, void *_val, size_t bytes)
{
struct qfprom_priv *priv = context;
- u8 *val = _val;
- int i = 0, words = bytes;
+ u32 *val = _val;
void __iomem *base = priv->qfpcorrected;
+ int words = DIV_ROUND_UP(bytes, sizeof(u32));
+ int i;
if (read_raw_data && priv->qfpraw)
base = priv->qfpraw;
- while (words--)
- *val++ = readb(base + reg + i++);
+ for (i = 0; i < words; i++)
+ *val++ = readl(base + reg + i * sizeof(u32));
return 0;
}
+/* Align reads to word boundary */
+static void qfprom_fixup_dt_cell_info(struct nvmem_device *nvmem,
+ struct nvmem_cell_info *cell)
+{
+ unsigned int byte_offset = cell->offset % sizeof(u32);
+
+ cell->bit_offset += byte_offset * BITS_PER_BYTE;
+ cell->offset -= byte_offset;
+ if (byte_offset && !cell->nbits)
+ cell->nbits = cell->bytes * BITS_PER_BYTE;
+}
+
static void qfprom_runtime_disable(void *data)
{
pm_runtime_disable(data);
@@ -358,10 +371,11 @@ static int qfprom_probe(struct platform_device *pdev)
struct nvmem_config econfig = {
.name = "qfprom",
.add_legacy_fixed_of_cells = true,
- .stride = 1,
- .word_size = 1,
+ .stride = 4,
+ .word_size = 4,
.id = NVMEM_DEVID_AUTO,
.reg_read = qfprom_reg_read,
+ .fixup_dt_cell_info = qfprom_fixup_dt_cell_info,
};
struct device *dev = &pdev->dev;
struct resource *res;
--
2.39.5
