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arch/risc-v/src/mpfs/mpfs_ddr.c: Re-try DDR training on any error

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Also errors which currently return other than -EAGAIN, are typically
recoverable with retraining. So just re-try trainining 20 times on any
error, resetting the controller in between.

Only reset if it is not recovered in this time.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
This commit is contained in:
Jukka Laitinen
2025-01-29 14:15:59 +02:00
committed by Xiang Xiao
parent 107b29ee67
commit ef875d7d9e
1 changed files with 15 additions and 3 deletions
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arch/risc-v/src/mpfs/mpfs_ddr.c
+15 -3
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@@ -3943,19 +3943,31 @@ static int mpfs_ddr_setup(struct mpfs_ddr_priv_s *priv)
int mpfs_ddr_init(void)
{
struct mpfs_ddr_priv_s *priv = &g_mpfs_ddr_priv;
int retry_count = 20;
int ddr_status;
/* On -EAGAIN, the whole training is restarted from the very beginning */
/* Restart training until it passes or retry_count reaches 0.
* Errors which return -EAGAIN are known to be always
* recoverable by controller reset; don't count these errors.
* Only count errors which return -EIO; they are typically recoverable.
* If they persist, however, eventually return failure, leading to
* re-trying after full reset.
*/
do
{
ddr_status = mpfs_ddr_setup(priv);
if (ddr_status == -EAGAIN)
if (ddr_status != OK)
{
mpfs_ddr_fail(priv);
}
if (ddr_status != -EAGAIN)
{
retry_count--;
}
}
while (ddr_status == -EAGAIN);
while (ddr_status != OK && retry_count > 0);
if (ddr_status == 0)
{