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i2c: qcom-geni: make sure I2C hub controllers can't use SE DMA

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The I2C Hub controller is a simpler GENI I2C variant that doesn't
support DMA at all, add a no_dma flag to make sure it nevers selects
the SE DMA mode with mappable 32bytes long transfers.

Fixes: cacd9643ec ("i2c: qcom-geni: add support for I2C Master Hub variant")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Mukesh Kumar Savaliya <mukesh.savaliya@oss.qualcomm.com>>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Neil Armstrong
2025-10-29 19:07:42 +01:00
committed by Wolfram Sang
parent e383f09614
commit c0c50e3743
1 changed files with 7 additions and 4 deletions
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11
drivers/i2c/busses/i2c-qcom-geni.c
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@@ -116,6 +116,7 @@ struct geni_i2c_dev {
dma_addr_t dma_addr;
struct dma_chan *tx_c;
struct dma_chan *rx_c;
bool no_dma;
bool gpi_mode;
bool abort_done;
bool is_tx_multi_desc_xfer;
@@ -447,7 +448,7 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
size_t len = msg->len;
struct i2c_msg *cur;
dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
dma_buf = gi2c->no_dma ? NULL : i2c_get_dma_safe_msg_buf(msg, 32);
if (dma_buf)
geni_se_select_mode(se, GENI_SE_DMA);
else
@@ -486,7 +487,7 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
size_t len = msg->len;
struct i2c_msg *cur;
dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
dma_buf = gi2c->no_dma ? NULL : i2c_get_dma_safe_msg_buf(msg, 32);
if (dma_buf)
geni_se_select_mode(se, GENI_SE_DMA);
else
@@ -1080,10 +1081,12 @@ static int geni_i2c_probe(struct platform_device *pdev)
goto err_resources;
}
if (desc && desc->no_dma_support)
if (desc && desc->no_dma_support) {
fifo_disable = false;
else
gi2c->no_dma = true;
} else {
fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;
}
if (fifo_disable) {
/* FIFO is disabled, so we can only use GPI DMA */