On 03/12/2024 23:09, Stephen Boyd wrote:
> Quoting Krzysztof Kozlowski (2024-11-28 07:08:01)
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 2ec9be21ff678e3343cccafa85801aa68805f440..d9ab42c625ddd61f9bf1857522d44d4547e42bf5 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -1022,6 +1022,16 @@ config SM_DISPCC_8550
>> Say Y if you want to support display devices and functionality such as
>> splash screen.
>>
>> +config SM_DISPCC_8750
>> + tristate "SM8750 Display Clock Controller"
>> + depends on ARM64 || COMPILE_TEST
>
> Please select QCOM_GDSC
Ack
>
>> + depends on SM_GCC_8750
>
> select? Or imply? It's a functional dependency, not a build time one.
ARM64 is as well functional dependency, ARCH_QCOM present in all other
drivers as well. It is all the same. The point is to limit the config
options available to users/distros when they do not need them. In this
particular case: if user does not select main clock controller (GCC)
then allowing to choose Display clock controller is pointless.
>
>> + help
>> diff --git a/drivers/clk/qcom/dispcc-sm8750.c b/drivers/clk/qcom/dispcc-sm8750.c
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..ff64ff93c4dbdd2aae22b55dd0e404544cc9373e
>> --- /dev/null
>> +++ b/drivers/clk/qcom/dispcc-sm8750.c
>> @@ -0,0 +1,1960 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2021, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2023-2024, Linaro Ltd.
>> + */
>> +
>> +#include <linux/clk.h>
>
> Is this include used?
Not used, copy pasta from older driver. I'll clean it up.
>
>> +#include <linux/clk-provider.h>
>> +#include <linux/err.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +#include <linux/pm_runtime.h>
>> +
>> +#include <dt-bindings/clock/qcom,sm8750-dispcc.h>
>> +
>> +#include "common.h"
>> +#include "clk-alpha-pll.h"
>> +#include "clk-branch.h"
>> +#include "clk-pll.h"
>> +#include "clk-rcg.h"
>> +#include "clk-regmap.h"
>> +#include "clk-regmap-divider.h"
>> +#include "clk-regmap-mux.h"
>> +#include "reset.h"
>> +#include "gdsc.h"
> [...]
>> +};
>> +
>> +static struct clk_rcg2 disp_cc_mdss_mdp_clk_src = {
>> + .cmd_rcgr = 0x8150,
>> + .mnd_width = 0,
>> + .hid_width = 5,
>> + .parent_map = disp_cc_parent_map_9,
>> + .freq_tbl = ftbl_disp_cc_mdss_mdp_clk_src,
>> + .clkr.hw.init = &(const struct clk_init_data) {
>> + .name = "disp_cc_mdss_mdp_clk_src",
>> + .parent_data = disp_cc_parent_data_9,
>> + .num_parents = ARRAY_SIZE(disp_cc_parent_data_9),
>> + .flags = CLK_SET_RATE_PARENT,
>> + .ops = &clk_rcg2_shared_ops, /* TODO: switch to cesta managed clocks */
>
> What is cesta?
Cesta is a new hardware block which receives votes from consumers and
then manages groups of clocks. We do not have drivers for it, so I am
not sure how this here will work out.
I will grow the explanation in comment.
>
>> + },
>> +};
>> +
>> +static struct clk_rcg2 disp_cc_mdss_pclk0_clk_src = {
>> + .cmd_rcgr = 0x8108,
>> + .mnd_width = 8,
>> + .hid_width = 5,
>> + .parent_map = disp_cc_parent_map_1,
>> + .freq_tbl = ftbl_disp_cc_esync0_clk_src,
>> + .clkr.hw.init = &(const struct clk_init_data) {
>> + .name = "disp_cc_mdss_pclk0_clk_src",
>> + .parent_data = disp_cc_parent_data_1,
>> + .num_parents = ARRAY_SIZE(disp_cc_parent_data_1),
>> + .flags = CLK_SET_RATE_PARENT,
>> + .ops = &clk_pixel_ops,
>> + },
> [...]
>> + .enable_reg = 0x80b4,
>> + .enable_mask = BIT(0),
>> + .hw.init = &(const struct clk_init_data) {
>> + .name = "disp_cc_osc_clk",
>> + .parent_hws = (const struct clk_hw*[]) {
>> + &disp_cc_osc_clk_src.clkr.hw,
>> + },
>> + .num_parents = 1,
>> + .flags = CLK_SET_RATE_PARENT,
>> + .ops = &clk_branch2_ops,
>> + },
>> + },
>> +};
>> +
>> +static struct gdsc mdss_gdsc = {
>> + .gdscr = 0x9000,
>> + .en_rest_wait_val = 0x2,
>> + .en_few_wait_val = 0x2,
>> + .clk_dis_wait_val = 0xf,
>> + .pd = {
>> + .name = "mdss_gdsc",
>> + },
>> + .pwrsts = PWRSTS_OFF_ON,
>> + .flags = POLL_CFG_GDSCR | HW_CTRL | RETAIN_FF_ENABLE,
>> + // TODO: no supply?
>
> What is this?
Development note. I will clean it up.
Best regards,
Krzysztof
