[PATCH v2] S5PV210 Correct clock register properties
Kukjin Kim
kgene.kim at samsung.com
Wed Jun 23 01:21:51 EDT 2010
MyungJoo Ham wrote:
>
> Note that this patch revises and merges the two previous patches:
> [PATCH] S5PV210 Correct clock register properties
> [PATCH] S5PV210 Correct clock source control register properties
>
> 1. Corrected shift values of I2S and UART clocks (CLK_GATE_IP3), which
were
> defined incorrectly.
>
> 2. Corrected shift values of sclk_audio, uclk1, sclk_fimd, sclk_mmc,
> sclk_spi, sclk_pwm, which had duplicated .enable/.ctrlbit with their
> twins defined in struct clk init_clocks_disable[] and struct clk
> init_clocks[]. We've changed their .enable/.ctrlbit to use CLK_SRC_MASK
> register to avoid the duplicated clock problem described below.
>
> --- Duplicated Clock Problem ---
> Please note that each clock definition should access different control
> register; otherwise, the system may suffer lockups. For example, if we
> have two clock definitions "a" and "b" which access the same register
> (and the shift value). Then, when we do:
>
> module A
> clk = clk_get("a");
> clk->clk_enable(clk);
>
> module B (context switch)
> clk = clk_get("b");
> clk->clk_enable(clk);
> do something with clk.
> clk->clk_disable(clk);
>
> module A (context switch)
> do something with clk
> * At this point, the system may hang.
>
> Therefore, there should be no clock definitions with the same contol
> register/shift. If we need to create "aliases", then, creating child
> clocks sharing the clock should be fine.
>
> Signed-off-by: MyungJoo Ham <myungjoo.ham at samsung.com>
> ---
> arch/arm/mach-s5pv210/clock.c | 72
++++++++++++++++++++--------------------
> 1 files changed, 36 insertions(+), 36 deletions(-)
>
> diff --git a/arch/arm/mach-s5pv210/clock.c b/arch/arm/mach-s5pv210/clock.c
> index 154bca4..10a9f84 100644
> --- a/arch/arm/mach-s5pv210/clock.c
> +++ b/arch/arm/mach-s5pv210/clock.c
> @@ -406,13 +406,13 @@ static struct clk init_clocks_disable[] = {
> .id = 0,
> .parent = &clk_p,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<4),
> + .ctrlbit = (1<<5),
If possible, please add space between <<, like (1 << 5)
> }, {
> .name = "i2s_v32",
> .id = 1,
> .parent = &clk_p,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<4),
> + .ctrlbit = (1<<6),
> }
> };
>
> @@ -429,25 +429,25 @@ static struct clk init_clocks[] = {
> .id = 0,
> .parent = &clk_pclk_psys.clk,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<7),
> + .ctrlbit = (1<<17),
> }, {
> .name = "uart",
> .id = 1,
> .parent = &clk_pclk_psys.clk,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<8),
> + .ctrlbit = (1<<18),
> }, {
> .name = "uart",
> .id = 2,
> .parent = &clk_pclk_psys.clk,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<9),
> + .ctrlbit = (1<<19),
> }, {
> .name = "uart",
> .id = 3,
> .parent = &clk_pclk_psys.clk,
> .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1<<10),
> + .ctrlbit = (1<<20),
> },
> };
>
> @@ -565,8 +565,8 @@ static struct clksrc_clk clk_sclk_audio0 = {
> .clk = {
> .name = "sclk_audio",
> .id = 0,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 4),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 24),
> },
> .sources = &clkset_sclk_audio0,
> .reg_src = { .reg = S5P_CLK_SRC6, .shift = 0, .size = 4 },
> @@ -594,8 +594,8 @@ static struct clksrc_clk clk_sclk_audio1 = {
> .clk = {
> .name = "sclk_audio",
> .id = 1,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 5),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 25),
> },
> .sources = &clkset_sclk_audio1,
> .reg_src = { .reg = S5P_CLK_SRC6, .shift = 4, .size = 4 },
> @@ -623,8 +623,8 @@ static struct clksrc_clk clk_sclk_audio2 = {
> .clk = {
> .name = "sclk_audio",
> .id = 2,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 6),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 26),
> },
> .sources = &clkset_sclk_audio2,
> .reg_src = { .reg = S5P_CLK_SRC6, .shift = 8, .size = 4 },
> @@ -680,8 +680,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "uclk1",
> .id = 0,
> - .ctrlbit = (1<<17),
> - .enable = s5pv210_clk_ip3_ctrl,
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 12),
> },
> .sources = &clkset_uart,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 16, .size = 4 },
> @@ -690,8 +690,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "uclk1",
> .id = 1,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 18),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 13),
> },
> .sources = &clkset_uart,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 20, .size = 4 },
> @@ -700,8 +700,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "uclk1",
> .id = 2,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 19),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 14),
> },
> .sources = &clkset_uart,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 24, .size = 4 },
> @@ -710,8 +710,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "uclk1",
> .id = 3,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 20),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 15),
> },
> .sources = &clkset_uart,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 28, .size = 4 },
> @@ -784,8 +784,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_fimd",
> .id = -1,
> - .enable = s5pv210_clk_ip1_ctrl,
> - .ctrlbit = (1 << 0),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 5),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC1, .shift = 20, .size = 4 },
> @@ -794,8 +794,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_mmc",
> .id = 0,
> - .enable = s5pv210_clk_ip2_ctrl,
> - .ctrlbit = (1 << 16),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 8),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 0, .size = 4 },
> @@ -804,8 +804,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_mmc",
> .id = 1,
> - .enable = s5pv210_clk_ip2_ctrl,
> - .ctrlbit = (1 << 17),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 9),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 4, .size = 4 },
> @@ -814,8 +814,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_mmc",
> .id = 2,
> - .enable = s5pv210_clk_ip2_ctrl,
> - .ctrlbit = (1 << 18),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 10),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 8, .size = 4 },
> @@ -824,8 +824,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_mmc",
> .id = 3,
> - .enable = s5pv210_clk_ip2_ctrl,
> - .ctrlbit = (1 << 19),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 11),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC4, .shift = 12, .size = 4 },
> @@ -874,8 +874,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_spi",
> .id = 0,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 12),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 16),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC5, .shift = 0, .size = 4 },
> @@ -884,8 +884,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_spi",
> .id = 1,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 13),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 17),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC5, .shift = 4, .size = 4 },
> @@ -904,8 +904,8 @@ static struct clksrc_clk clksrcs[] = {
> .clk = {
> .name = "sclk_pwm",
> .id = -1,
> - .enable = s5pv210_clk_ip3_ctrl,
> - .ctrlbit = (1 << 23),
> + .enable = s5pv210_clk_mask0_ctrl,
> + .ctrlbit = (1 << 19),
> },
> .sources = &clkset_group2,
> .reg_src = { .reg = S5P_CLK_SRC5, .shift = 12, .size = 4 },
> --
Looks good.
But missed something such as sclk_dac, sclk_hdmi, sclk_mixer, sclk_fimc,
sclk_cam, sclk_csis, and sclk_pwi.
Any reason?
Thanks.
Best regards,
Kgene.
--
Kukjin Kim <kgene.kim at samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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