2013-03-07 13:14:35

by Andreas Fenkart

Subject: [PATCH] ARM: OMAP2+: am33xx: preserve JTAG clock aka debugss_ick.

This fixes JTAG support on am33xx.

Signed-off-by: Andreas Fenkart <[email protected]>
---
arch/arm/Kconfig.debug | 6 ++++++
arch/arm/mach-omap2/cclock33xx_data.c | 11 ++++++++---
2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index acdddda..8120940 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -632,4 +632,10 @@ config PID_IN_CONTEXTIDR
additional instructions during context switch. Say Y here only if you
are planning to use hardware trace tools with this kernel.

+config JTAG
+ bool "Enable JTAG clock"
+ depends on SOC_AM33XX
+ help
+ Enable or keep JTAG clock enabled
+
endmenu
diff --git a/arch/arm/mach-omap2/cclock33xx_data.c b/arch/arm/mach-omap2/cclock33xx_data.c
index 476b820..b7470de 100644
--- a/arch/arm/mach-omap2/cclock33xx_data.c
+++ b/arch/arm/mach-omap2/cclock33xx_data.c
@@ -429,9 +429,14 @@ DEFINE_STRUCT_CLK(smartreflex1_fck, dpll_core_ck_parents, clk_ops_null);
* - usbotg_fck (its additional clock and not really a modulemode)
* - ieee5000
*/
-DEFINE_CLK_GATE(debugss_ick, "dpll_core_m4_ck", &dpll_core_m4_ck, 0x0,
- AM33XX_CM_WKUP_DEBUGSS_CLKCTRL, AM33XX_MODULEMODE_SWCTRL_SHIFT,
- 0x0, NULL);
+#ifdef CONFIG_JTAG
+#define DEBUGSS_FLAGS CLK_IGNORE_UNUSED
+#else
+#define DEBUGSS_FLAGS 0x0
+#endif
+DEFINE_CLK_GATE(debugss_ick, "dpll_core_m4_ck", &dpll_core_m4_ck,
+ DEBUGSS_FLAGS, AM33XX_CM_WKUP_DEBUGSS_CLKCTRL,
+ AM33XX_MODULEMODE_SWCTRL_SHIFT, 0x0, NULL);

DEFINE_CLK_GATE(mmu_fck, "dpll_core_m4_ck", &dpll_core_m4_ck, 0x0,
AM33XX_CM_GFX_MMUDATA_CLKCTRL, AM33XX_MODULEMODE_SWCTRL_SHIFT,
--
1.7.10.4

2013-03-07 13:21:33

by Vaibhav Bedia

Subject: RE: [PATCH] ARM: OMAP2+: am33xx: preserve JTAG clock aka debugss_ick.

On Thu, Mar 07, 2013 at 18:43:27, Andreas Fenkart wrote:
> This fixes JTAG support on am33xx.
>

Please refer to http://www.spinics.net/lists/linux-omap/msg87476.html

Regards,
Vaibhav