The patch below does not apply to the 5.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 59be177a909ac320e5f4b2a461ac09e20f35b2d8 Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Jos=C3=A9=20Roberto=20de=20Souza?= jose.souza@intel.com Date: Tue, 12 Oct 2021 18:00:46 -0700 Subject: [PATCH] drm/i915: Remove memory frequency calculation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

This memory frequency calculated is only used to check if it is zero, what is not useful as it will never actually be zero.

Also the calculation is wrong, we should be checking other bit to select the appropriate frequency multiplier while this code is stuck with a fixed multiplier.

So here dropping it as whole.

v2: - Also remove memory frequency calculation for gen9 LP platforms

Cc: Yakui Zhao yakui.zhao@intel.com Cc: Matt Roper matthew.d.roper@intel.com Fixes: 5d0c938ec9cc ("drm/i915/gen11+: Only load DRAM information from pcode") Signed-off-by: José Roberto de Souza jose.souza@intel.com Reviewed-by: Matt Roper matthew.d.roper@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20211013010046.91858-1-jose.so... (cherry picked from commit 83f52364b15265aec47d07e02b0fbf4093ab8554) Signed-off-by: Jani Nikula jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 4037030f0984..9023d4ecf3b3 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -11048,12 +11048,6 @@ enum skl_power_gate { #define DC_STATE_DEBUG_MASK_CORES (1 << 0) #define DC_STATE_DEBUG_MASK_MEMORY_UP (1 << 1)

-#define BXT_P_CR_MC_BIOS_REQ_0_0_0 _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x7114) -#define BXT_REQ_DATA_MASK 0x3F -#define BXT_DRAM_CHANNEL_ACTIVE_SHIFT 12 -#define BXT_DRAM_CHANNEL_ACTIVE_MASK (0xF << 12) -#define BXT_MEMORY_FREQ_MULTIPLIER_HZ 133333333 - #define BXT_D_CR_DRP0_DUNIT8 0x1000 #define BXT_D_CR_DRP0_DUNIT9 0x1200 #define BXT_D_CR_DRP0_DUNIT_START 8 @@ -11084,9 +11078,7 @@ enum skl_power_gate { #define BXT_DRAM_TYPE_LPDDR4 (0x2 << 22) #define BXT_DRAM_TYPE_DDR4 (0x4 << 22)

-#define SKL_MEMORY_FREQ_MULTIPLIER_HZ 266666666 #define SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5E04) -#define SKL_REQ_DATA_MASK (0xF << 0) #define DG1_GEAR_TYPE REG_BIT(16)

#define SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5000) diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c index 91866520c173..7acce64b0941 100644 --- a/drivers/gpu/drm/i915/intel_dram.c +++ b/drivers/gpu/drm/i915/intel_dram.c @@ -244,7 +244,6 @@ static int skl_get_dram_info(struct drm_i915_private *i915) { struct dram_info *dram_info = &i915->dram_info; - u32 mem_freq_khz, val; int ret;

dram_info->type = skl_get_dram_type(i915); @@ -255,17 +254,6 @@ skl_get_dram_info(struct drm_i915_private *i915) if (ret) return ret;

- val = intel_uncore_read(&i915->uncore, - SKL_MC_BIOS_DATA_0_0_0_MCHBAR_PCU); - mem_freq_khz = DIV_ROUND_UP((val & SKL_REQ_DATA_MASK) * - SKL_MEMORY_FREQ_MULTIPLIER_HZ, 1000); - - if (dram_info->num_channels * mem_freq_khz == 0) { - drm_info(&i915->drm, - "Couldn't get system memory bandwidth\n"); - return -EINVAL; - } - return 0; }

@@ -350,24 +338,10 @@ static void bxt_get_dimm_info(struct dram_dimm_info *dimm, u32 val) static int bxt_get_dram_info(struct drm_i915_private *i915) { struct dram_info *dram_info = &i915->dram_info; - u32 dram_channels; - u32 mem_freq_khz, val; - u8 num_active_channels, valid_ranks = 0; + u32 val; + u8 valid_ranks = 0; int i;

- val = intel_uncore_read(&i915->uncore, BXT_P_CR_MC_BIOS_REQ_0_0_0); - mem_freq_khz = DIV_ROUND_UP((val & BXT_REQ_DATA_MASK) * - BXT_MEMORY_FREQ_MULTIPLIER_HZ, 1000); - - dram_channels = val & BXT_DRAM_CHANNEL_ACTIVE_MASK; - num_active_channels = hweight32(dram_channels); - - if (mem_freq_khz * num_active_channels == 0) { - drm_info(&i915->drm, - "Couldn't get system memory bandwidth\n"); - return -EINVAL; - } - /* * Now read each DUNIT8/9/10/11 to check the rank of each dimms. */