This is a note to let you know that I've just added the patch titled
i2c: qcom-geni: add desc struct to prepare support for I2C Master Hub variant
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-qcom-geni-add-desc-struct-to-prepare-support-for.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 563606693cd1d2b34691aaff0e0f54f4afaecce7
Author: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Date: Tue Nov 29 15:47:05 2022 +0100
i2c: qcom-geni: add desc struct to prepare support for I2C Master Hub variant
[ Upstream commit 14d02fbadb5dc1cdf66078ef8430dd1cd22bfd53 ]
The I2C Master Hub is a stripped down version of the GENI Serial Engine
QUP Wrapper Controller but only supporting I2C serial engines without
DMA support.
Those I2C serial engines variants have some requirements:
- a separate "core" clock
- doesn't support DMA, thus no memory interconnect path
- fixed FIFO size not discoverable in the HW_PARAM_0 register
Add a desc struct specifying all those requirements which will be used in
a next change when adding the I2C Master Hub serial engine compatible.
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Stable-dep-of: 9ba48db9f77c ("i2c: qcom-geni: Add missing geni_icc_disable in geni_i2c_runtime_resume")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index fc1dcc19f2a17..f811999e3aac9 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -88,6 +88,7 @@ struct geni_i2c_dev {
int cur_wr;
int cur_rd;
spinlock_t lock;
+ struct clk *core_clk;
u32 clk_freq_out;
const struct geni_i2c_clk_fld *clk_fld;
int suspended;
@@ -99,6 +100,13 @@ struct geni_i2c_dev {
bool gpi_mode;
};
+struct geni_i2c_desc {
+ bool has_core_clk;
+ char *icc_ddr;
+ bool no_dma_support;
+ unsigned int tx_fifo_depth;
+};
+
struct geni_i2c_err_log {
int err;
const char *msg;
@@ -755,6 +763,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
u32 proto, tx_depth, fifo_disable;
int ret;
struct device *dev = &pdev->dev;
+ const struct geni_i2c_desc *desc = NULL;
gi2c = devm_kzalloc(dev, sizeof(*gi2c), GFP_KERNEL);
if (!gi2c)
@@ -767,6 +776,14 @@ static int geni_i2c_probe(struct platform_device *pdev)
if (IS_ERR(gi2c->se.base))
return PTR_ERR(gi2c->se.base);
+ desc = device_get_match_data(&pdev->dev);
+
+ if (desc && desc->has_core_clk) {
+ gi2c->core_clk = devm_clk_get(dev, "core");
+ if (IS_ERR(gi2c->core_clk))
+ return PTR_ERR(gi2c->core_clk);
+ }
+
gi2c->se.clk = devm_clk_get(dev, "se");
if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(dev))
return PTR_ERR(gi2c->se.clk);
@@ -810,7 +827,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
gi2c->adap.dev.of_node = dev->of_node;
strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
- ret = geni_icc_get(&gi2c->se, "qup-memory");
+ ret = geni_icc_get(&gi2c->se, desc ? desc->icc_ddr : "qup-memory");
if (ret)
return ret;
/*
@@ -820,12 +837,17 @@ static int geni_i2c_probe(struct platform_device *pdev)
*/
gi2c->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
- gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
+ if (!desc || desc->icc_ddr)
+ gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
ret = geni_icc_set_bw(&gi2c->se);
if (ret)
return ret;
+ ret = clk_prepare_enable(gi2c->core_clk);
+ if (ret)
+ return ret;
+
ret = geni_se_resources_on(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning on resources %d\n", ret);
@@ -835,10 +857,15 @@ static int geni_i2c_probe(struct platform_device *pdev)
if (proto != GENI_SE_I2C) {
dev_err(dev, "Invalid proto %d\n", proto);
geni_se_resources_off(&gi2c->se);
+ clk_disable_unprepare(gi2c->core_clk);
return -ENXIO;
}
- fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;
+ if (desc && desc->no_dma_support)
+ fifo_disable = false;
+ 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 */
gi2c->gpi_mode = true;
@@ -852,6 +879,16 @@ static int geni_i2c_probe(struct platform_device *pdev)
} else {
gi2c->gpi_mode = false;
tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);
+
+ /* I2C Master Hub Serial Elements doesn't have the HW_PARAM_0 register */
+ if (!tx_depth && desc)
+ tx_depth = desc->tx_fifo_depth;
+
+ if (!tx_depth) {
+ dev_err(dev, "Invalid TX FIFO depth\n");
+ return -EINVAL;
+ }
+
gi2c->tx_wm = tx_depth - 1;
geni_se_init(&gi2c->se, gi2c->tx_wm, tx_depth);
geni_se_config_packing(&gi2c->se, BITS_PER_BYTE,
@@ -860,6 +897,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
}
+ clk_disable_unprepare(gi2c->core_clk);
ret = geni_se_resources_off(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning off resources %d\n", ret);
@@ -925,6 +963,8 @@ static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
gi2c->suspended = 1;
}
+ clk_disable_unprepare(gi2c->core_clk);
+
return geni_icc_disable(&gi2c->se);
}
@@ -937,6 +977,10 @@ static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
if (ret)
return ret;
+ ret = clk_prepare_enable(gi2c->core_clk);
+ if (ret)
+ return ret;
+
ret = geni_se_resources_on(&gi2c->se);
if (ret)
return ret;
