On 2019-08-06 17:36, Pierre-Louis Bossart wrote:
On 8/6/19 10:27 AM, Cezary Rojewski wrote:
On 2019-08-06 02:55, Pierre-Louis Bossart wrote:
diff --git a/drivers/soundwire/cadence_master.c
b/drivers/soundwire/cadence_master.c
index 5d9729b4d634..89c55e4bb72c 100644
--- a/drivers/soundwire/cadence_master.c
+++ b/drivers/soundwire/cadence_master.c
@@ -48,6 +48,8 @@
#define CDNS_MCP_SSPSTAT 0xC
#define CDNS_MCP_FRAME_SHAPE 0x10
#define CDNS_MCP_FRAME_SHAPE_INIT 0x14
+#define CDNS_MCP_FRAME_SHAPE_COL_MASK GENMASK(2, 0)
+#define CDNS_MCP_FRAME_SHAPE_ROW_OFFSET 3
#define CDNS_MCP_CONFIG_UPDATE 0x18
#define CDNS_MCP_CONFIG_UPDATE_BIT BIT(0)
@@ -175,7 +177,6 @@
/* Driver defaults */
#define CDNS_DEFAULT_CLK_DIVIDER 0
-#define CDNS_DEFAULT_FRAME_SHAPE 0x30
#define CDNS_DEFAULT_SSP_INTERVAL 0x18
#define CDNS_TX_TIMEOUT 2000
@@ -901,6 +902,20 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
}
EXPORT_SYMBOL(sdw_cdns_pdi_init);
+static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
+{
+ u32 val;
+ int c;
+ int r;
+
+ r = sdw_find_row_index(n_rows);
+ c = sdw_find_col_index(n_cols) & CDNS_MCP_FRAME_SHAPE_COL_MASK;
+
+ val = (r << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | c;
+
+ return val;
+}
+
Guess this have been said already, but this function could be
simplified - unless you really want to keep explicit variable
declaration. Both "c" and "r" declarations could be merged into single
line while "val" is not needed at all.
One more thing - is AND bitwise op really needed for cols explicitly?
We know all col values upfront - these are static and declared in
global table nearby. Static declaration takes care of "initial
range-check". Is another one necessary?
Moreover, this is a _get_ and certainly not a _set_ type of function.
I'd even consider renaming it to: "cdns_get_frame_shape" as this is
neither a _set_ nor an explicit initial frame shape setter.
It might be even helpful to split two usages:
#define sdw_frame_shape(col_idx, row_idx) \
((row_idx << CDNS_MCP_FRAME_SHAPE_ROW_OFFSET) | col_idx)
u32 cdns_get_frame_shape(u16 rows, u16 cols)
{
u16 c, r;
r = sdw_find_row_index(rows);
c = sdw_find_col_index(cols);
return sdw_frame_shape(c, r);
}
The above may even be simplified into one-liner.
This is a function used once on startup, there is no real need to
simplify further. The separate variables help add debug traces as needed
and keep the code readable while showing how the values are encoded into
a register.
Eh, I've thought it's gonna be exposed to userspace (via uapi) so it can
be fetched by tests or tools.
In such case - if there is a single usage only - guess function is fine
as is.
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