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remoteproc: stm32: Properly set co-processor state when attaching 

Introduce the required mechanic to set the state of the M4 in order
to properly deal with scenarios where the co-processor has been
started by another entity.

Mainly based on the work published by Arnaud Pouliquen [1].

[1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877

Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200714200445.1427257-7-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2020-07-14 14:04:40 -06:00 committed by Bjorn Andersson
parent 9276536f45
commit 376ffdc044
1 changed files with 31 additions and 0 deletions
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31
drivers/remoteproc/stm32_rproc.c
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@ -39,6 +39,13 @@
#define STM32_MBX_VQ1_ID 1
#define STM32_MBX_SHUTDOWN "shutdown"
#define M4_STATE_OFF 0
#define M4_STATE_INI 1
#define M4_STATE_CRUN 2
#define M4_STATE_CSTOP 3
#define M4_STATE_STANDBY 4
#define M4_STATE_CRASH 5
struct stm32_syscon {
struct regmap *map;
u32 reg;
@ -636,12 +643,29 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev,
return 0;
}
static int stm32_rproc_get_m4_status(struct stm32_rproc *ddata,
unsigned int *state)
{
/* See stm32_rproc_parse_dt() */
if (!ddata->m4_state.map) {
/*
* We couldn't get the coprocessor's state, assume
* it is not running.
*/
state = M4_STATE_OFF;
return 0;
}
return regmap_read(ddata->m4_state.map, ddata->m4_state.reg, state);
}
static int stm32_rproc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct stm32_rproc *ddata;
struct device_node *np = dev->of_node;
struct rproc *rproc;
unsigned int state;
int ret;
ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
@ -664,6 +688,13 @@ static int stm32_rproc_probe(struct platform_device *pdev)
if (ret)
goto free_rproc;
ret = stm32_rproc_get_m4_status(ddata, &state);
if (ret)
goto free_rproc;
if (state == M4_STATE_CRUN)
rproc->state = RPROC_DETACHED;
rproc->has_iommu = false;
ddata->workqueue = create_workqueue(dev_name(dev));
if (!ddata->workqueue) {