[U-Boot] [PATCH 152/172] ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_center() part 8

Marek Vasut
2015-07-27T20:51:55Z

The search_stop_check() always resets the bit_chk to a new value,
so bit_chk will never survive between search_left_edge() and
search_right_edge() invocation. There is thus no need to pass
it into these functions, so make bit_chk local to them.

Signed-off-by: Marek Vasut <marex@denx.de>
---
drivers/ddr/altera/sequencer.c | 33 +++++++++++++++------------------
1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c
index eadf39b..a01a2dc 100644
--- a/drivers/ddr/altera/sequencer.c
+++ b/drivers/ddr/altera/sequencer.c
@@ -1841,7 +1841,6 @@ static u32 search_stop_check(const int write, const int d, const int rank_bgn,
* @write_group: Write Group
* @read_group: Read Group
* @test_bgn: Rank number to begin the test
- * @bit_chk: Resulting bit mask after the test
* @sticky_bit_chk: Resulting sticky bit mask after the test
* @left_edge: Left edge of the DQ/DQS phase
* @right_edge: Right edge of the DQ/DQS phase
@@ -1851,14 +1850,14 @@ static u32 search_stop_check(const int write, const int d, const int rank_bgn,
*/
static void search_left_edge(const int write, const int rank_bgn,
const u32 write_group, const u32 read_group, const u32 test_bgn,
- u32 *bit_chk, u32 *sticky_bit_chk,
+ u32 *sticky_bit_chk,
int *left_edge, int *right_edge, const u32 use_read_test)
{
const u32 delay_max = write ? IO_IO_OUT1_DELAY_MAX : IO_IO_IN_DELAY_MAX;
const u32 dqs_max = write ? IO_IO_OUT1_DELAY_MAX : IO_DQS_IN_DELAY_MAX;
const u32 per_dqs = write ? RW_MGR_MEM_DQ_PER_WRITE_DQS :
RW_MGR_MEM_DQ_PER_READ_DQS;
- u32 stop;
+ u32 stop, bit_chk;
int i, d;

for (d = 0; d <= dqs_max; d++) {
@@ -1870,14 +1869,14 @@ static void search_left_edge(const int write, const int rank_bgn,
writel(0, &sdr_scc_mgr->update);

stop = search_stop_check(write, d, rank_bgn, write_group,
- read_group, bit_chk, sticky_bit_chk,
+ read_group, &bit_chk, sticky_bit_chk,
use_read_test);
if (stop == 1)
break;

/* stop != 1 */
for (i = 0; i < per_dqs; i++) {
- if (*bit_chk & 1) {
+ if (bit_chk & 1) {
/*
* Remember a passing test as
* the left_edge.
@@ -1893,7 +1892,7 @@ static void search_left_edge(const int write, const int rank_bgn,
if (left_edge[i] == delay_max + 1)
right_edge[i] = -(d + 1);
}
- *bit_chk = *bit_chk >> 1;
+ bit_chk >>= 1;
}
}

@@ -1952,7 +1951,6 @@ static void search_left_edge(const int write, const int rank_bgn,
* @read_group: Read Group
* @start_dqs: DQS start phase
* @start_dqs_en: DQS enable start phase
- * @bit_chk: Resulting bit mask after the test
* @sticky_bit_chk: Resulting sticky bit mask after the test
* @left_edge: Left edge of the DQ/DQS phase
* @right_edge: Right edge of the DQ/DQS phase
@@ -1963,14 +1961,14 @@ static void search_left_edge(const int write, const int rank_bgn,
static int search_right_edge(const int write, const int rank_bgn,
const u32 write_group, const u32 read_group,
const int start_dqs, const int start_dqs_en,
- u32 *bit_chk, u32 *sticky_bit_chk,
+ u32 *sticky_bit_chk,
int *left_edge, int *right_edge, const u32 use_read_test)
{
const u32 delay_max = write ? IO_IO_OUT1_DELAY_MAX : IO_IO_IN_DELAY_MAX;
const u32 dqs_max = write ? IO_IO_OUT1_DELAY_MAX : IO_DQS_IN_DELAY_MAX;
const u32 per_dqs = write ? RW_MGR_MEM_DQ_PER_WRITE_DQS :
RW_MGR_MEM_DQ_PER_READ_DQS;
- u32 stop;
+ u32 stop, bit_chk;
int i, d;

for (d = 0; d <= dqs_max - start_dqs; d++) {
@@ -1991,7 +1989,7 @@ static int search_right_edge(const int write, const int rank_bgn,
writel(0, &sdr_scc_mgr->update);

stop = search_stop_check(write, d, rank_bgn, write_group,
- read_group, bit_chk, sticky_bit_chk,
+ read_group, &bit_chk, sticky_bit_chk,
use_read_test);
if (stop == 1) {
if (write && (d == 0)) { /* WRITE-ONLY */
@@ -2011,7 +2009,7 @@ static int search_right_edge(const int write, const int rank_bgn,

/* stop != 1 */
for (i = 0; i < per_dqs; i++) {
- if (*bit_chk & 1) {
+ if (bit_chk & 1) {
/*
* Remember a passing test as
* the right_edge.
@@ -2052,10 +2050,10 @@ static int search_right_edge(const int write, const int rank_bgn,
__func__, __LINE__, d);
debug_cond(DLEVEL == 2,
"bit_chk_test=%i left_edge[%u]: %d ",
- *bit_chk & 1, i, left_edge[i]);
+ bit_chk & 1, i, left_edge[i]);
debug_cond(DLEVEL == 2, "right_edge[%u]: %d\n", i,
right_edge[i]);
- *bit_chk = *bit_chk >> 1;
+ bit_chk >>= 1;
}
}

@@ -2205,7 +2203,6 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn,
* Store these as signed since there are comparisons with
* signed numbers.
*/
- uint32_t bit_chk;
uint32_t sticky_bit_chk;
int32_t left_edge[RW_MGR_MEM_DQ_PER_READ_DQS];
int32_t right_edge[RW_MGR_MEM_DQ_PER_READ_DQS];
@@ -2231,14 +2228,14 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn,

/* Search for the left edge of the window for each bit */
search_left_edge(0, rank_bgn, write_group, read_group, test_bgn,
- &bit_chk, &sticky_bit_chk,
+ &sticky_bit_chk,
left_edge, right_edge, use_read_test);

/* Search for the right edge of the window for each bit */
ret = search_right_edge(0, rank_bgn, write_group, read_group,
start_dqs, start_dqs_en,
- &bit_chk, &sticky_bit_chk,
+ &sticky_bit_chk,
left_edge, right_edge, use_read_test);
if (ret) {
/*
@@ -2922,13 +2919,13 @@ static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn,

/* Search for the left edge of the window for each bit */
search_left_edge(1, rank_bgn, write_group, 0, test_bgn,
- &bit_chk, &sticky_bit_chk,
+ &sticky_bit_chk,
left_edge, right_edge, 0);

/* Search for the right edge of the window for each bit */
ret = search_right_edge(1, rank_bgn, write_group, 0,
start_dqs, 0,
- &bit_chk, &sticky_bit_chk,
+ &sticky_bit_chk,
left_edge, right_edge, 0);
if (ret) {
set_failing_group_stage(test_bgn + ret - 1, CAL_STAGE_WRITES,
--
2.1.4