Re: [PATCH v6 0/2] Fix corner cases with disabling CLKRUN in tpm_tis

From: Jarkko Sakkinen
Date: Sun Dec 24 2017 - 14:47:24 EST


On Fri, Dec 22, 2017 at 12:13:42PM -0800, Azhar Shaikh wrote:
> Changes from v1:
> - Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - Add NULL checks before calling clk_toggle callback
> - Use IS_ENABLED instead of ifdef in tpm_tis_clkrun_toggle()
> - Do not call tpm_platform_begin_xfer() and tpm_platform_end_xfer()
> from tpm_tis_clkrun_toggle(). Make them static again.
>
> - Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
> - This is a new patch in this series as per suggestion from Jason.
> - Is the current implementation ok or I should move the code in tpm_tis_pnp_remove()
> and tpm_tis_plat_remove() inside tpm_tis_remove(). That way all the unmapping
> can be done in one place, instead of 3 different places now. Also the unmapping
> in tpm_tis_init() can be moved to tpm_tis_remove(), since in case of error
> tpm_tis_core_init() calls tpm_tis_remove(). Kindly suggest.
>
> Changes from v2:
> - Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - No changes
>
> - Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
> - Updated is_bsw() function to have the #ifdef CONFIG_X86 check within the function
> itself. Also removed the #ifdef CONFIG_X86 from all other places around is_bsw()
>
> Changes from v3:
> - Patch 1: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - Change function name from clk_toggle to clk_enable
> - Update the commit message.
>
> - Patch 2: "tpm_tis: Move ilb_base_addr to tpm_tis_tcg_phy"
> - No changes
>
> Changes from v4:
> - The numbering of patches is now interchanged.
>
> - Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
> - Had to move ilb_base_addr to tpm_tis_data, from tpm_tis_tcg_phy.
> Since the ioremapping of ilb_base_addr had to be done before any TPM access,
> hence moved the variable to tpm_tis_data.
> - Also move the ioremapping of ilb_base_addr from tpm_tis_init() to
> tpm_tis_core_init() i.e. before any TPM access is done.
> - Rename marco LPC_CNTRL_REG_OFFSET to LPC_CNTRL_OFFSET
> - Update the commit message.
>
> - Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - Remove the functions tpm_platform_begin_xfer() and tpm_platform_end_xfer()
> - Move the code from these functions to tpm_tis_clkrun_enable().
>
> Changes from v5:
> - Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
> - No changes
>
> - Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - Update the commit message.
>
> Changes from v6:
> - - Patch 1: "tpm_tis: Move ilb_base_addr to tpm_tis_data"
> - No changes
>
> - Patch 2: "tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()"
> - chip->ops was set to NULL in tpm_del_char_device() called from tpm_chip_unregister() in
> error/driver exit path. Fix this code. (Suggested by Javier Martinez Canillas and Jason Gunthorpe)
> - Add a comment in tpm_tis_clkrun_enable() function.
>
> Azhar Shaikh (2):
> tpm_tis: Move ilb_base_addr to tpm_tis_data
> tpm: Keep CLKRUN enabled throughout the duration of transmit_cmd()
>
> drivers/char/tpm/tpm-interface.c | 6 ++
> drivers/char/tpm/tpm_tis.c | 121 ++++++---------------------------------
> drivers/char/tpm/tpm_tis_core.c | 111 +++++++++++++++++++++++++++++++++--
> drivers/char/tpm/tpm_tis_core.h | 17 ++++++
> include/linux/tpm.h | 1 +
> 5 files changed, 147 insertions(+), 109 deletions(-)
>
> --
> 1.9.1
>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@xxxxxxxxxxxxxxx>
Tested-by: Jarkko Sakkinen <jarkko.sakkine@xxxxxxxxxxxxxxx> (with SPI
TPM on Sandybridge machine)

/Jarkko