Since commit 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") some characters loss is noticed on i.MX6ULL UART as reported by Christoph Niedermaier.
The intention of such commit was to increase the SW2ISO field for i.MX6SX only, but since cpuidle-imx6sx is also used on i.MX6UL/i.MX6ULL this caused unintended side effects on other SoCs.
Fix this problem by keeping the original SW2ISO value for i.MX6UL/i.MX6ULL and only increase SW2ISO in the i.MX6SX case.
Cc: stable@vger.kernel.org Fixes: 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") Reported-by: Christoph Niedermaier cniedermaier@dh-electronics.com Signed-off-by: Fabio Estevam festevam@gmail.com --- arch/arm/mach-imx/cpuidle-imx6sx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index fd0053e47a15..57cb9c763222 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -15,6 +15,7 @@
#include "common.h" #include "cpuidle.h" +#include "hardware.h"
static int imx6sx_idle_finish(unsigned long val) { @@ -99,8 +100,12 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = { .safe_state_index = 0, };
+#define SW2ISO_ORIGINAL 0x2 +#define SW2ISO_IMX6SX 0xf int __init imx6sx_cpuidle_init(void) { + u32 sw2iso = SW2ISO_ORIGINAL; + imx6_set_int_mem_clk_lpm(true); imx6_enable_rbc(false); imx_gpc_set_l2_mem_power_in_lpm(false); @@ -110,7 +115,9 @@ int __init imx6sx_cpuidle_init(void) * except for power up sw2iso which need to be * larger than LDO ramp up time. */ - imx_gpc_set_arm_power_up_timing(0xf, 1); + if (cpu_is_imx6sx()) + sw2iso = SW2ISO_IMX6SX; + imx_gpc_set_arm_power_up_timing(sw2iso, 1); imx_gpc_set_arm_power_down_timing(1, 1);
return cpuidle_register(&imx6sx_cpuidle_driver, NULL);
On 5/2/19 1:30 PM, Fabio Estevam wrote:
Since commit 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") some characters loss is noticed on i.MX6ULL UART as reported by Christoph Niedermaier.
The intention of such commit was to increase the SW2ISO field for i.MX6SX only, but since cpuidle-imx6sx is also used on i.MX6UL/i.MX6ULL this caused unintended side effects on other SoCs.
Fix this problem by keeping the original SW2ISO value for i.MX6UL/i.MX6ULL and only increase SW2ISO in the i.MX6SX case.
Cc: stable@vger.kernel.org Fixes: 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") Reported-by: Christoph Niedermaier cniedermaier@dh-electronics.com Signed-off-by: Fabio Estevam festevam@gmail.com
arch/arm/mach-imx/cpuidle-imx6sx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index fd0053e47a15..57cb9c763222 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -15,6 +15,7 @@ #include "common.h" #include "cpuidle.h" +#include "hardware.h" static int imx6sx_idle_finish(unsigned long val) { @@ -99,8 +100,12 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = { .safe_state_index = 0, }; +#define SW2ISO_ORIGINAL 0x2 +#define SW2ISO_IMX6SX 0xf int __init imx6sx_cpuidle_init(void) {
- u32 sw2iso = SW2ISO_ORIGINAL;
- imx6_set_int_mem_clk_lpm(true); imx6_enable_rbc(false); imx_gpc_set_l2_mem_power_in_lpm(false);
@@ -110,7 +115,9 @@ int __init imx6sx_cpuidle_init(void) * except for power up sw2iso which need to be * larger than LDO ramp up time. */
- imx_gpc_set_arm_power_up_timing(0xf, 1);
- if (cpu_is_imx6sx())
sw2iso = SW2ISO_IMX6SX;- imx_gpc_set_arm_power_up_timing(sw2iso, 1); imx_gpc_set_arm_power_down_timing(1, 1);
return cpuidle_register(&imx6sx_cpuidle_driver, NULL);
Tested-by: Sébastien Szymanski sebastien.szymanski@armadeus.com
Regards,
From: Fabio Estevam festevam@gmail.com Sent: Thursday 2nd May 2019 13:30
Since commit 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") some characters loss is noticed on i.MX6ULL UART as reported by Christoph Niedermaier.
The intention of such commit was to increase the SW2ISO field for i.MX6SX only, but since cpuidle-imx6sx is also used on i.MX6UL/i.MX6ULL this caused unintended side effects on other SoCs.
Fix this problem by keeping the original SW2ISO value for i.MX6UL/i.MX6ULL and only increase SW2ISO in the i.MX6SX case.
Cc: stable@vger.kernel.org Fixes: 1e434b703248 ("ARM: imx: update the cpu power up timing setting on i.mx6sx") Reported-by: Christoph Niedermaier cniedermaier@dh-electronics.com Signed-off-by: Fabio Estevam festevam@gmail.com
arch/arm/mach-imx/cpuidle-imx6sx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/cpuidle-imx6sx.c b/arch/arm/mach-imx/cpuidle-imx6sx.c index fd0053e47a15..57cb9c763222 100644 --- a/arch/arm/mach-imx/cpuidle-imx6sx.c +++ b/arch/arm/mach-imx/cpuidle-imx6sx.c @@ -15,6 +15,7 @@ #include "common.h" #include "cpuidle.h" +#include "hardware.h" static int imx6sx_idle_finish(unsigned long val) { @@ -99,8 +100,12 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = { .safe_state_index = 0, }; +#define SW2ISO_ORIGINAL 0x2 +#define SW2ISO_IMX6SX 0xf int __init imx6sx_cpuidle_init(void) {
- u32 sw2iso = SW2ISO_ORIGINAL;
imx6_set_int_mem_clk_lpm(true); imx6_enable_rbc(false); imx_gpc_set_l2_mem_power_in_lpm(false); @@ -110,7 +115,9 @@ int __init imx6sx_cpuidle_init(void)
- except for power up sw2iso which need to be
- larger than LDO ramp up time.
*/
- imx_gpc_set_arm_power_up_timing(0xf, 1);
- if (cpu_is_imx6sx())
- sw2iso = SW2ISO_IMX6SX;
- imx_gpc_set_arm_power_up_timing(sw2iso, 1);
imx_gpc_set_arm_power_down_timing(1, 1); return cpuidle_register(&imx6sx_cpuidle_driver, NULL);
Tested-by: Christoph Niedermaier cniedermaier@dh-electronics.com
Best regards,
linux-stable-mirror@lists.linaro.org
-
Christoph Niedermaier -
Fabio Estevam -
Sébastien Szymanski