On 10/05/2018 03:47 PM, Ulf Hansson wrote:
On 5 October 2018 at 15:22, Ludovic Barre <ludovic.Barre@xxxxxx> wrote:
From: Ludovic Barre <ludovic.barre@xxxxxx>
This patch creates a common mmci_dma_setup/release which calls
dma_setup/release callbacks of mmci_host_ops and manages
common features like use_dma... If there is a fallbacks to
pio mode, dma functions must check use_dma.
error management:
-mmci_dmae_setup fail if Tx and Rx dma channels are not defined
-qcom_dma_setup fail if one of both dma channels is not defined,
Qcom has no specific resource to release, just mmci dmae resource.
Makes perfect sense!
[...]
+void mmci_dma_setup(struct mmci_host *host)
+{
+ if (!host->ops || !host->ops->dma_setup)
+ return;
+
+ if (host->ops->dma_setup(host)) {
+ mmci_dma_release(host);
Please remove this and let the variants clean up themselves. That
makes it more straight forward.
This common call was not such a good idea.
Ok, I will back on first idea.
+ return;
+ }
+
+ host->use_dma = true;
+}
+
[...]
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 01e6c6b..9b0a960 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -273,7 +273,8 @@ struct variant_data {
/* mmci variant callbacks */
struct mmci_host_ops {
- void (*dma_setup)(struct mmci_host *host);
+ int (*dma_setup)(struct mmci_host *host);
+ void (*dma_release)(struct mmci_host *host);
};
struct mmci_host_next {
@@ -323,6 +324,7 @@ struct mmci_host {
unsigned int size;
int (*get_rx_fifocnt)(struct mmci_host *h, u32 status, int remain);
+ u8 use_dma:1;
#ifdef CONFIG_DMA_ENGINE
/* DMA stuff */
struct dma_chan *dma_current;
@@ -336,3 +338,14 @@ struct mmci_host {
#endif
};
+#ifdef CONFIG_DMA_ENGINE
+void mmci_variant_init(struct mmci_host *host);
+#else
+static inline void mmci_variant_init(struct mmci_host *host)
+{
+}
+#endif
This can be kept in mmci.c instead.
OK
+
+int mmci_dmae_setup(struct mmci_host *host);
+void mmci_dmae_release(struct mmci_host *host);
+
diff --git a/drivers/mmc/host/mmci_qcom_dml.c b/drivers/mmc/host/mmci_qcom_dml.c
index be3fab5..aa070a9 100644
--- a/drivers/mmc/host/mmci_qcom_dml.c
+++ b/drivers/mmc/host/mmci_qcom_dml.c
@@ -119,19 +119,22 @@ static int of_get_dml_pipe_index(struct device_node *np, const char *name)
}
/* Initialize the dml hardware connected to SD Card controller */
-static void qcom_dma_setup(struct mmci_host *host)
+static int qcom_dma_setup(struct mmci_host *host)
{
u32 config;
void __iomem *base;
int consumer_id, producer_id;
struct device_node *np = host->mmc->parent->of_node;
+ if (mmci_dmae_setup(host))
+ return -EINVAL;
+
consumer_id = of_get_dml_pipe_index(np, "tx");
producer_id = of_get_dml_pipe_index(np, "rx");
if (producer_id < 0 || consumer_id < 0) {
host->variant->qcom_dml = false;
- return;
+ return -EINVAL;
This relies on error handling to be done by mmci_dma_setup(), which as
stated, feels a bit wrong.
I would rather just call mmci_dmae_realease() here, before returning -EINVAL.
OK
[...]
Otherwise, this looks good to me now.
Kind regards
Uffe
