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spmi: msm: correctly handle multiple mapping entries

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On v5 & v7 controllers, multiple mapping for different
Execution Environment exists, if the mapping owner is for
a different Execution Environment we can only read and
not write any data.

To allow us to find a Write mapping for our Execution
Environment, we can overwritte a mapping if we encounter
a new one which we own.

Implement this logic, the result is the same mapping
table as in Linux.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: caleb.connolly@linaro.org # sdm845
Link: https://lore.kernel.org/r/20250328-topic-sm8x50-spmi-fix-v1-4-a7548d3aef0d@linaro.org
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Neil Armstrong
2025-03-28 09:53:24 +01:00
committed by Caleb Connolly
parent 69400a696c
commit 5b233442af
1 changed files with 17 additions and 3 deletions
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20
drivers/spmi/spmi-msm.c
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@@ -254,16 +254,30 @@ static struct dm_spmi_ops msm_spmi_ops = {
.write = msm_spmi_write,
};
/*
* In order to allow multiple EEs to write to a single PPID in arbiter
* version 5 and 7, there is more than one APID mapped to each PPID.
* The owner field for each of these mappings specifies the EE which is
* allowed to write to the APID.
*/
static void msm_spmi_channel_map_v5(struct msm_spmi_priv *priv, unsigned int i,
uint8_t slave_id, uint8_t pid)
{
/* Mark channels read-only when from different owner */
uint32_t cnfg = readl(priv->spmi_cnfg + ARB_CHANNEL_OFFSET(i));
uint8_t owner = SPMI_OWNERSHIP_PERIPH2OWNER(cnfg);
bool prev_valid = priv->channel_map[slave_id][pid] & SPMI_CHANNEL_VALID;
uint32_t prev_read_only = priv->channel_map[slave_id][pid] & SPMI_CHANNEL_READ_ONLY;
priv->channel_map[slave_id][pid] = i | SPMI_CHANNEL_VALID;
if (owner != priv->owner)
priv->channel_map[slave_id][pid] |= SPMI_CHANNEL_READ_ONLY;
if (!prev_valid) {
/* First PPID mapping */
priv->channel_map[slave_id][pid] = i | SPMI_CHANNEL_VALID;
if (owner != priv->owner)
priv->channel_map[slave_id][pid] |= SPMI_CHANNEL_READ_ONLY;
} else if ((owner == priv->owner) && prev_read_only) {
/* Read only and we found one we own, switch */
priv->channel_map[slave_id][pid] = i | SPMI_CHANNEL_VALID;
}
}
static int msm_spmi_probe(struct udevice *dev)