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net: mvpp2: clear BM pool before initialization

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[ Upstream commit 9f538b415db862e74b8c5d3abbccfc1b2b6caa38 ]

Register value persist after booting the kernel using
kexec which results in kernel panic. Thus clear the
BM pool registers before initialisation to fix the issue.

Fixes: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Jenishkumar Maheshbhai Patel <jpatel2@marvell.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://lore.kernel.org/r/20240119035914.2595665-1-jpatel2@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jenishkumar Maheshbhai Patel 2024-01-18 19:59:14 -08:00 • committed by Ksawlii
parent 8b70abda54
commit d572881801
1 changed files with 26 additions and 1 deletions
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27
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -581,12 +581,38 @@ err_unroll_pools:
return err;
}
/* Cleanup pool before actual initialization in the OS */
static void mvpp2_bm_pool_cleanup(struct mvpp2 *priv, int pool_id)
{
unsigned int thread = mvpp2_cpu_to_thread(priv, get_cpu());
u32 val;
int i;
/* Drain the BM from all possible residues left by firmware */
for (i = 0; i < MVPP2_BM_POOL_SIZE_MAX; i++)
mvpp2_thread_read(priv, thread, MVPP2_BM_PHY_ALLOC_REG(pool_id));
put_cpu();
/* Stop the BM pool */
val = mvpp2_read(priv, MVPP2_BM_POOL_CTRL_REG(pool_id));
val |= MVPP2_BM_STOP_MASK;
mvpp2_write(priv, MVPP2_BM_POOL_CTRL_REG(pool_id), val);
}
static int mvpp2_bm_init(struct device *dev, struct mvpp2 *priv)
{
enum dma_data_direction dma_dir = DMA_FROM_DEVICE;
int i, err, poolnum = MVPP2_BM_POOLS_NUM;
struct mvpp2_port *port;
if (priv->percpu_pools)
poolnum = mvpp2_get_nrxqs(priv) * 2;
/* Clean up the pool state in case it contains stale state */
for (i = 0; i < poolnum; i++)
mvpp2_bm_pool_cleanup(priv, i);
if (priv->percpu_pools) {
for (i = 0; i < priv->port_count; i++) {
port = priv->port_list[i];
@ -596,7 +622,6 @@ static int mvpp2_bm_init(struct device *dev, struct mvpp2 *priv)
}
}
poolnum = mvpp2_get_nrxqs(priv) * 2;
for (i = 0; i < poolnum; i++) {
/* the pool in use */
int pn = i / (poolnum / 2);