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x-ms-exchange-antispam-messagedata: kGHucKCOUGmcSEIB0Y+FIrxIU4rpkgKqKWWh1Hc5eSGTfOk+BmWoTKQUbcRNiTzzdkzYVLE9xpVg9gxiuVpk92LVERdcfjCfk7htxmf2quboraTUJOjosOquC+Y+m4g0xVWeamVfAcpjs2JeP4W+MQ0121GVYe5zcuNc0/TBVSIK1AInFpdfxoetQr/oyEQpH8Y4OVzRK1JXGVafgaqh5V31C1fiZPUHNza2WsoEeZmrIK6MNxnnILMU0xp8cvciwzPd9mm7Jm8oIZdZf7o261Ck/PbwVBbpMhkPeTVSf2Gc28VhGq9dRgWBmHyvB0gf4vAh/98/I7NSkXpBBuQl4XOOrZoH337PXDM/ZTXS33Z1rGtQCaCYl9DfvPB5NUcOtWN6GAaIl6Rhi0r9pjA9n9YmaGwwOQRQwx6HerTXB80MUNQttCQYQbloQRB/JJYwRko4biZk/zIThHFb2l9TsfvLO1bHUjOpQvJpB4dkAJE= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: synopsys.com X-MS-Exchange-CrossTenant-Network-Message-Id: a939bbd2-40a5-4df3-09de-08d813c0eabf X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Jun 2020 19:50:56.4802 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: c33c9f88-1eb7-4099-9700-16013fd9e8aa X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JqlYaUHt6fe97+abztkhvfswQUQS22mNxy+G+c4oIyfhYX79JJv1k94gau+f13cXCnjNIwjmYd1Nf3wuItEPFQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR1201MB0229 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vineet,=0A= =0A= could you also peek this patch to for-curr as we don't have any disagreemen= t about it?=0A= =0A= I'll respin the rest of the patches later. Thanks.=0A= ---=0A= Eugeniy Paltsev=0A= =0A= =0A= ________________________________________=0A= From: Eugeniy Paltsev =0A= Sent: Thursday, June 4, 2020 20:39=0A= To: linux-snps-arc@lists.infradead.org; Vineet Gupta=0A= Cc: linux-kernel@vger.kernel.org; Alexey Brodkin; Eugeniy Paltsev=0A= Subject: [PATCH v2 2/4] ARC: ARCv2: support loop buffer (LPB) disabling=0A= =0A= On HS cores, loop buffer (LPB) is programmable in runtime and can=0A= be optionally disabled.=0A= =0A= Signed-off-by: Eugeniy Paltsev =0A= ---=0A= arch/arc/Kconfig | 6 ++++++=0A= arch/arc/kernel/head.S | 8 ++++++++=0A= 2 files changed, 14 insertions(+)=0A= =0A= diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig=0A= index 7034c217708f..2dc142c8e1f5 100644=0A= --- a/arch/arc/Kconfig=0A= +++ b/arch/arc/Kconfig=0A= @@ -473,6 +473,12 @@ config ARC_IRQ_NO_AUTOSAVE=0A= This is programmable and can be optionally disabled in which case= =0A= software INTERRUPT_PROLOGUE/EPILGUE do the needed work=0A= =0A= +config ARC_LPB_DISABLE=0A= + bool "Disable loop buffer (LPB)"=0A= + help=0A= + On HS cores, loop buffer (LPB) is programmable in runtime and can= =0A= + be optionally disabled.=0A= +=0A= endif # ISA_ARCV2=0A= =0A= endmenu # "ARC CPU Configuration"=0A= diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S=0A= index 6eb23f1545ee..17fd1ed700cc 100644=0A= --- a/arch/arc/kernel/head.S=0A= +++ b/arch/arc/kernel/head.S=0A= @@ -59,6 +59,14 @@=0A= bclr r5, r5, STATUS_AD_BIT=0A= #endif=0A= kflag r5=0A= +=0A= +#ifdef CONFIG_ARC_LPB_DISABLE=0A= + lr r5, [ARC_REG_LPB_BUILD]=0A= + breq r5, 0, 1f ; LPB doesn't exist=0A= + mov r5, 1=0A= + sr r5, [ARC_REG_LPB_CTRL]=0A= +1:=0A= +#endif /* CONFIG_ARC_LPB_DISABLE */=0A= #endif=0A= ; Config DSP_CTRL properly, so kernel may use integer multiply,=0A= ; multiply-accumulate, and divide operations=0A= --=0A= 2.21.3=0A= =0A=