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SubjectRe: [PATCH V1] i2c: tegra: Fix Maximum transfer size
Date
On 2019-01-02 22:48, Sowjanya Komatineni wrote:
> Tegra194 supports maximum 64K Bytes transfer per packet.
> Tegra186 and prior supports maximum 4K Bytes transfer per packet.
>
> This patch fixes this payload difference between Tegra194 and prior
> tegra chipsets.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> drivers/i2c/busses/i2c-tegra.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index 437294ea2f0a..0c08ed8b6c94 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -167,6 +167,7 @@ struct tegra_i2c_hw_feature {
> bool has_multi_master_mode;
> bool has_slcg_override_reg;
> bool has_mst_fifo;
> + struct i2c_adapter_quirks *quirks;

This could perhaps be a pointer to const?

> };
>
> /**
> @@ -833,6 +834,12 @@ static const struct i2c_adapter_quirks tegra_i2c_quirks = {
> .max_write_len = 4096,
> };
>
> +static const struct i2c_adapter_quirks tegra194_i2c_quirks = {
> + .flags = I2C_AQ_NO_ZERO_LEN,

This is not mentioned in the commit message and the flag is not present in
the old struct tegra_i2c_quirks above. Are you trying to sneak changes past
the maintainers, or was the change simply not intentional?

> + .max_read_len = 65536,
> + .max_write_len = 65536,

Those are highly dubious when .max_read_len and .max_write_len are of type
u16. I bet you could just remove them.

Cheers,
Peter

> +};
> +
> static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
> .has_continue_xfer_support = false,
> .has_per_pkt_xfer_complete_irq = false,
> @@ -844,6 +851,7 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
> .has_multi_master_mode = false,
> .has_slcg_override_reg = false,
> .has_mst_fifo = false,
> + .quirks = &tegra_i2c_quirks,
> };
>
> static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
> @@ -857,6 +865,7 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
> .has_multi_master_mode = false,
> .has_slcg_override_reg = false,
> .has_mst_fifo = false,
> + .quirks = &tegra_i2c_quirks,
> };
>
> static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
> @@ -870,6 +879,7 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
> .has_multi_master_mode = false,
> .has_slcg_override_reg = false,
> .has_mst_fifo = false,
> + .quirks = &tegra_i2c_quirks,
> };
>
> static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
> @@ -883,6 +893,7 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
> .has_multi_master_mode = false,
> .has_slcg_override_reg = true,
> .has_mst_fifo = false,
> + .quirks = &tegra_i2c_quirks,
> };
>
> static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
> @@ -896,6 +907,7 @@ static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
> .has_multi_master_mode = true,
> .has_slcg_override_reg = true,
> .has_mst_fifo = false,
> + .quirks = &tegra_i2c_quirks,
> };
>
> static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
> @@ -909,6 +921,7 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
> .has_multi_master_mode = true,
> .has_slcg_override_reg = true,
> .has_mst_fifo = true,
> + .quirks = &tegra194_i2c_quirks,
> };
>
> /* Match table for of_platform binding */
> @@ -960,7 +973,6 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> i2c_dev->base = base;
> i2c_dev->div_clk = div_clk;
> i2c_dev->adapter.algo = &tegra_i2c_algo;
> - i2c_dev->adapter.quirks = &tegra_i2c_quirks;
> i2c_dev->irq = irq;
> i2c_dev->cont_id = pdev->id;
> i2c_dev->dev = &pdev->dev;
> @@ -976,6 +988,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
> i2c_dev->hw = of_device_get_match_data(&pdev->dev);
> i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
> "nvidia,tegra20-i2c-dvc");
> + i2c_dev->adapter.quirks = i2c_dev->hw->quirks;
> +
> init_completion(&i2c_dev->msg_complete);
> spin_lock_init(&i2c_dev->xfer_lock);
>
>

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