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SubjectRe: [PATCH v3] pinctrl: ingenic: Fix regmap on X series SoCs
Hi Aidan,

Le mer., mars 16 2022 at 23:20:30 +0000, Aidan MacDonald
<aidanmacdonald.0x0@gmail.com> a écrit :
> The X series Ingenic SoCs have a shadow GPIO group which is at a
> higher
> offset than the other groups, and is used for all GPIO configuration.
> The regmap did not take this offset into account and set max_register
> too low, so the regmap API blocked writes to the shadow group, which
> made the pinctrl driver unable to configure any pins.
>
> Fix this by adding regmap access tables to the chip info.
>
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>

Since this is a fix, you need to add a Fixes: tag that points to the
commit that introduced the bug, and add a Cc: <stable@vger.kernel.org>
line as well.

> ---
> v1 -> v2: use regmap_access_table
> v2 -> v3: compute max_register instead of putting it in chip_info
>
> drivers/pinctrl/pinctrl-ingenic.c | 46
> ++++++++++++++++++++++++++++++-
> 1 file changed, 45 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/pinctrl-ingenic.c
> b/drivers/pinctrl/pinctrl-ingenic.c
> index 2712f51eb238..fa6becca1788 100644
> --- a/drivers/pinctrl/pinctrl-ingenic.c
> +++ b/drivers/pinctrl/pinctrl-ingenic.c
> @@ -119,6 +119,8 @@ struct ingenic_chip_info {
> unsigned int num_functions;
>
> const u32 *pull_ups, *pull_downs;
> +
> + const struct regmap_access_table *access_table;
> };
>
> struct ingenic_pinctrl {
> @@ -2179,6 +2181,17 @@ static const struct function_desc
> x1000_functions[] = {
> { "mac", x1000_mac_groups, ARRAY_SIZE(x1000_mac_groups), },
> };
>
> +static const struct regmap_range x1000_access_ranges[] = {
> + regmap_reg_range(0x000, 0x400 - 4),
> + regmap_reg_range(0x700, 0x800 - 4),
> +};
> +
> +/* shared with X1500 */
> +static const struct regmap_access_table x1000_access_table = {
> + .yes_ranges = x1000_access_ranges,
> + .n_yes_ranges = ARRAY_SIZE(x1000_access_ranges),
> +};
> +
> static const struct ingenic_chip_info x1000_chip_info = {
> .num_chips = 4,
> .reg_offset = 0x100,
> @@ -2189,6 +2202,7 @@ static const struct ingenic_chip_info
> x1000_chip_info = {
> .num_functions = ARRAY_SIZE(x1000_functions),
> .pull_ups = x1000_pull_ups,
> .pull_downs = x1000_pull_downs,
> + .access_table = &x1000_access_table,
> };
>
> static int x1500_uart0_data_pins[] = { 0x4a, 0x4b, };
> @@ -2300,6 +2314,7 @@ static const struct ingenic_chip_info
> x1500_chip_info = {
> .num_functions = ARRAY_SIZE(x1500_functions),
> .pull_ups = x1000_pull_ups,
> .pull_downs = x1000_pull_downs,
> + .access_table = &x1000_access_table,
> };
>
> static const u32 x1830_pull_ups[4] = {
> @@ -2506,6 +2521,16 @@ static const struct function_desc
> x1830_functions[] = {
> { "mac", x1830_mac_groups, ARRAY_SIZE(x1830_mac_groups), },
> };
>
> +static const struct regmap_range x1830_access_ranges[] = {
> + regmap_reg_range(0x0000, 0x4000 - 4),
> + regmap_reg_range(0x7000, 0x8000 - 4),
> +};
> +
> +static const struct regmap_access_table x1830_access_table = {
> + .yes_ranges = x1830_access_ranges,
> + .n_yes_ranges = ARRAY_SIZE(x1830_access_ranges),
> +};
> +
> static const struct ingenic_chip_info x1830_chip_info = {
> .num_chips = 4,
> .reg_offset = 0x1000,
> @@ -2516,6 +2541,7 @@ static const struct ingenic_chip_info
> x1830_chip_info = {
> .num_functions = ARRAY_SIZE(x1830_functions),
> .pull_ups = x1830_pull_ups,
> .pull_downs = x1830_pull_downs,
> + .access_table = &x1830_access_table,
> };
>
> static const u32 x2000_pull_ups[5] = {
> @@ -2969,6 +2995,17 @@ static const struct function_desc
> x2000_functions[] = {
> { "otg", x2000_otg_groups, ARRAY_SIZE(x2000_otg_groups), },
> };
>
> +static const struct regmap_range x2000_access_ranges[] = {
> + regmap_reg_range(0x000, 0x500 - 4),
> + regmap_reg_range(0x700, 0x800 - 4),
> +};
> +
> +/* shared with X2100 */
> +static const struct regmap_access_table x2000_access_table = {
> + .yes_ranges = x2000_access_ranges,
> + .n_yes_ranges = ARRAY_SIZE(x2000_access_ranges),
> +};
> +
> static const struct ingenic_chip_info x2000_chip_info = {
> .num_chips = 5,
> .reg_offset = 0x100,
> @@ -2979,6 +3016,7 @@ static const struct ingenic_chip_info
> x2000_chip_info = {
> .num_functions = ARRAY_SIZE(x2000_functions),
> .pull_ups = x2000_pull_ups,
> .pull_downs = x2000_pull_downs,
> + .access_table = &x2000_access_table,
> };
>
> static const u32 x2100_pull_ups[5] = {
> @@ -3189,6 +3227,7 @@ static const struct ingenic_chip_info
> x2100_chip_info = {
> .num_functions = ARRAY_SIZE(x2100_functions),
> .pull_ups = x2100_pull_ups,
> .pull_downs = x2100_pull_downs,
> + .access_table = &x2000_access_table,
> };
>
> static u32 ingenic_gpio_read_reg(struct ingenic_gpio_chip *jzgc, u8
> reg)
> @@ -4168,7 +4207,12 @@ static int __init ingenic_pinctrl_probe(struct
> platform_device *pdev)
> return PTR_ERR(base);
>
> regmap_config = ingenic_pinctrl_regmap_config;
> - regmap_config.max_register = chip_info->num_chips *
> chip_info->reg_offset;
> + if (chip_info->access_table) {
> + regmap_config.rd_table = chip_info->access_table;
> + regmap_config.wr_table = chip_info->access_table;
> + } else {
> + regmap_config.max_register = chip_info->num_chips *
> chip_info->reg_offset - 4;

You do actually change how regmap_config.max_register is computed here,
without explaining anywhere why it is changed. I'm not saying that it's
wrong, but you should explain in the commit message why this is changed.

Cheers,
-Paul

> + }
>
> jzpc->map = devm_regmap_init_mmio(dev, base, &regmap_config);
> if (IS_ERR(jzpc->map)) {
> --
> 2.34.1
>


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