linux.git/drivers/clk/thead, branch for-next Linux kernel source tree clk: thead: Fix TH1520 emmc and shdci clock rate 2024-12-17T20:17:50+00:00 Maksim Kiselev bigunclemax@gmail.com 2024-12-10T08:30:27+00:00 f4bf0b909a6bf64a2220a42a7c8b8c2ee1b77b89 In accordance with LicheePi 4A BSP the clock that comes to emmc/sdhci is 198Mhz which is got through frequency division of source clock VIDEO PLL by 4 [1]. But now the AP_SUBSYS driver sets the CLK EMMC SDIO to the same frequency as the VIDEO PLL, equal to 792 MHz. This causes emmc/sdhci to work 4 times slower. Let's fix this issue by adding fixed factor clock that divides VIDEO PLL by 4 for emmc/sdhci. Link: https://github.com/revyos/thead-kernel/blob/7563179071a314f41cdcdbfd8cf6e101e73707f3/drivers/clk/thead/clk-light-fm.c#L454 Fixes: ae81b69fd2b1 ("clk: thead: Add support for T-Head TH1520 AP_SUBSYS clocks") Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com> Link: https://lore.kernel.org/r/20241210083029.92620-1-bigunclemax@gmail.com Tested-by: Xi Ruoyao <xry111@xry111.site> Reviewed-by: Drew Fustini <dfustini@tenstorrent.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> 
In accordance with LicheePi 4A BSP the clock that comes to emmc/sdhci
is 198Mhz which is got through frequency division of source clock
VIDEO PLL by 4 [1].

But now the AP_SUBSYS driver sets the CLK EMMC SDIO to the same
frequency as the VIDEO PLL, equal to 792 MHz. This causes emmc/sdhci
to work 4 times slower.

Let's fix this issue by adding fixed factor clock that divides
VIDEO PLL by 4 for emmc/sdhci.

Link: https://github.com/revyos/thead-kernel/blob/7563179071a314f41cdcdbfd8cf6e101e73707f3/drivers/clk/thead/clk-light-fm.c#L454

Fixes: ae81b69fd2b1 ("clk: thead: Add support for T-Head TH1520 AP_SUBSYS clocks")
Signed-off-by: Maksim Kiselev <bigunclemax@gmail.com>
Link: https://lore.kernel.org/r/20241210083029.92620-1-bigunclemax@gmail.com
Tested-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Drew Fustini <dfustini@tenstorrent.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk: thead: fix dependency on clk_ignore_unused 2024-07-31T21:51:47+00:00 Drew Fustini drew@pdp7.com 2024-07-31T06:14:40+00:00 39a3396558fb97e6e7d4c1eb04c2166da31904a9 Add the CLK_IGNORE_UNUSED flag to the vp-axi clock (CLK_VP_AXI) to avoid depending on clk_ignore_unused in the cmdline. Without this fix, the emmc-sdio clock (CLK_EMMC_SDIO) fails to work after vp-axi is disabled. Signed-off-by: Drew Fustini <drew@pdp7.com> Link: https://lore.kernel.org/r/20240731061439.3807172-1-drew@pdp7.com Fixes: ae81b69fd2b1 ("clk: thead: Add support for T-Head TH1520 AP_SUBSYS clocks") Signed-off-by: Stephen Boyd <sboyd@kernel.org> 
Add the CLK_IGNORE_UNUSED flag to the vp-axi clock (CLK_VP_AXI) to avoid
depending on clk_ignore_unused in the cmdline. Without this fix, the
emmc-sdio clock (CLK_EMMC_SDIO) fails to work after vp-axi is disabled.

Signed-off-by: Drew Fustini <drew@pdp7.com>
Link: https://lore.kernel.org/r/20240731061439.3807172-1-drew@pdp7.com
Fixes: ae81b69fd2b1 ("clk: thead: Add support for T-Head TH1520 AP_SUBSYS clocks")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk: T-Head: Disable on 32-bit Targets 2024-07-22T21:29:23+00:00 Palmer Dabbelt palmer@rivosinc.com 2024-07-19T15:10:27+00:00 0e91ac701c69c44840e8d36566604cac1b638880 This fails to build on 32-bit targets because of a missing __udivdi3. IIRC the right way to fix that is to avoid the division, but I just want a tree that builds and the only real T-Head platforms are 64-bit right now. Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Link: https://lore.kernel.org/r/20240719151027.16152-1-palmer@rivosinc.com Acked-by: Drew Fustini <drew@pdp7.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> 
This fails to build on 32-bit targets because of a missing __udivdi3.
IIRC the right way to fix that is to avoid the division, but I just want
a tree that builds and the only real T-Head platforms are 64-bit right
now.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20240719151027.16152-1-palmer@rivosinc.com
Acked-by: Drew Fustini <drew@pdp7.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
clk: thead: Add support for T-Head TH1520 AP_SUBSYS clocks 2024-07-15T19:15:01+00:00 Drew Fustini dfustini@tenstorrent.com 2024-07-11T16:56:20+00:00 ae81b69fd2b1eb4885b352749b1fd1172e2f0f18 Add support for the AP sub-system clock controller in the T-Head TH1520. This include CPU, DPU, GMAC and TEE PLLs. Link: https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf Co-developed-by: Yangtao Li <frank.li@vivo.com> Signed-off-by: Yangtao Li <frank.li@vivo.com> Co-developed-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Link: https://git.beagleboard.org/beaglev-ahead/beaglev-ahead/-/tree/main/docs Signed-off-by: Drew Fustini <dfustini@tenstorrent.com> Link: https://lore.kernel.org/r/20240711-th1520-clk-v3-2-6ff17bb318fb@tenstorrent.com Signed-off-by: Stephen Boyd <sboyd@kernel.org> 
Add support for the AP sub-system clock controller in the T-Head TH1520.
This include CPU, DPU, GMAC and TEE PLLs.

Link: https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf
Co-developed-by: Yangtao Li <frank.li@vivo.com>
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Co-developed-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://git.beagleboard.org/beaglev-ahead/beaglev-ahead/-/tree/main/docs
Signed-off-by: Drew Fustini <dfustini@tenstorrent.com>
Link: https://lore.kernel.org/r/20240711-th1520-clk-v3-2-6ff17bb318fb@tenstorrent.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>